ABSTRACT:

See Big Sandy River Watershed Collection

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Des Moines River basin is the largest basin in the state of Iowa, covering approximately 14,800 square miles. The headwaters originate at Lake Shetek located in Murray County, MN, however the river is only gauged up to Windom, MN. Spanning the entire state from North to South, the basin generally flows in a southeasterly direction and drains to the Mississippi River, with the outlet located just downstream of the city of Keokuk Iowa. The basin is roughly 360 miles long and has an average width of 55 miles. The Des Moines River has a very sinuous channel with low banks and a small slope. During times of heavy rains, the valleys in the basin can be subjected to serious flooding as was seen in the 1993 flood of record. The primary land use in the basin is agriculture. The largest urbanized areas in the watershed (population over 10,000), include Des Moines, Ottumwa, Fort Dodge, and Boone. There are also several other small towns located along the banks of the Des Moines River and spread
throughout the basin.

There are two reservoirs constructed and operated by the US Army Corps of Engineers in the watershed: Saylorville Lake and Lake Red Rock. Both dams are located on the main stem of the Des Moines River and are operated in tandem by the Rock Island District. The purpose of the reservoirs is to provide flood damage reduction, to create recreational opportunities, to augment water supply, to enhance water quality, to augment flows for the lower Des Moines River, and to provide fish and wildlife conservation. There are no Locks located along the Des Moines River as there is not sufficient width or depth for a navigation channel.

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The climate of California is the result of three major factors peculiar to the location and physiography of the state. These are the latitude, the influence of the Pacific Ocean, and the orientation and extreme range of topography of the State. The influence of the Pacific Ocean gives the immediate coastal areas a true maritime climate. However, the mountain ranges, which shut off the Sacramento Basin from the ocean and the interior of the continent, cause unusually wide variations and abrupt discontinuities in climate within the basin.

Topography is the most important influence on areal distribution of precipitation in California. The pattern of average precipitation in California reflects the influence of the physical configuration of the land surface. Precipitation is heavy on the windward side of the coastal ranges because of lifting of the moisture-bearing winds over the mountains. The Central Valley to the east of the coastal ranges has a drier, more continental cllmate, but the western slope of the Sierr Nevada is a region of normally heay precipitation. These latter mountains lie across the path followed by moist air moving inland and reach a much higher elevation than the coastal ranges. Major state-wide storms in California result when the deep southwest wind current in the warm moist sector of a Pacific storm is superimposed upon the efficient rain-producing mechanism of California topography. These major storms pass through California only during the fall, winter and spring, with maximum frequency during the winter.

The climate of the valley floor is characterized by mild wlnters with moderate precipitation, and hot, dry summers. The mountain watershed has colder winters, heavy rain and snowfall, and warm, dry summers. Maximum and minimum temperatures of 118 °F and 17 °F, respectively, have been recorded on the valley floor. Normal annual precipitation varies from less than 15 inches on the Valley floor to over 90 inches in the Sierra Nevada. Approximately 85% of the precipitation occurs during the period of November through April. Precipitation normally falls as rain below the 5,000 ft level and as snow above, although occasionally there is rain over almost the entire area

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Susquehanna River watershed is the second largest watershed east of the Mississippi River with a contributing drainage area of approximately 27,500 sq. mi. Originating in New York State and flowing through Pennsylvania and Maryland, the Susquehanna River flows in a southerly direction for approximately 630 mi before emptying into the Chesapeake Bay. The Susquehanna River watershed is bordered by the Ohio River to the west, Delaware River to the east, and the Lake Erie Basin to the north. Major tributaries to the Susquehanna River include the Chemung River, West Branch Susquehanna River, and Juniata River.

The Upper Susquehanna River, as defined by NAB, lies upstream of the Chemung River confluence. This portion of the larger Susquehanna River watershed consists of steeply sloped hills and ridges and is largely comprised of farmland.1 However, there are several large population centers, including Binghamton, NY, Johnson City, NY, Endicott, NY, Cortland, NY, and Oneonta, NY. Approximately 500,000 people reside within the Upper Susquehanna River watershed.

Elevations range from approximately 630 ft above sea level near the Chemung River confluence to over 2700 ft above sea level in the northern portion of the Upper Susquehanna River watershed.

The source of the Upper Susquehanna River lies within Otsego Lake, which is near Cooperstown, NY. Flowing generally southwest for a distance of approximately 110 miles, the river passes the villages of Unadilla, Bainbridge, and Windsor, NY. The Unadilla River, which is a major tributary, enters from the west. East Sidney Dam, which lies on Ouleout Creek, provides flood damage reduction along the Upper Susquehanna River downstream of the Village of Unadilla, NY. The Upper Susquehanna River then enters the Commonwealth of Pennsylvania and makes a 180-degree loop of approximately 20 miles. The river then re-enters New York and flows for approximately 20 miles downstream. At this point, the Chenango River enters from the north within the City of Binghamton, NY. Whitney Point Dam, lying on the Otselic River (which is a tributary to the Tioughnioga River and in turn the Chenango River), provides additional flood damage reduction below this point. The river then flows past the cities of Johnson City and Endicott, NY before re-entering the Commonwealth of Pennsylvania approximately 10 miles upstream of the Chemung River confluence.

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The drainage area above Alamo, approximately 4,770 square miles in size, is generally mountainous, and lies in west-central Arizona. The drainage area is bounded on the north by the Cottonwood Cliffs; on the east, by the Juniper and Santa Maria Mountains; on the south by Date Creek and the Harcuvar Mountains; and on the west by the Hualpai Mountains.

The Bill Williams River is formed about 47 miles upstream from its mouth by the confluence of the Big Sandy and Santa Maria Rivers. From the confluence, the flow is southwest for about 8 miles on an average gradient of 18 feet per mile to Alamo Dam. Bullard Wash is the largest tributary along this reach.

Below Alamo Dam, the river flows almost due west to its confluence with the Colorado River. The Big Sandy River, the larger of the two main tributaries to the Bill Williams River, drains an area of about 2,840 square miles. This stream, which is formed by the confluence of Trout and Knight Creeks, flows southward about 49 miles on an average stream gradient of 38 feet per mile to its confluence with the Santa Maria River. Burro Creek is the largest tributary in this reach.

The Santa Maria River drains an area of about 1,550 square miles. This stream, which is formed by the confluence of Kirkland and Sycamore Creeks, flows southwestward about 51 miles to its junction with the Big Sandy River. The stream gradient of the Santa Maria River is about 30 feet per mile. Date Creek is the largest tributary in this reach. The streambed gradients of many of the minor upstream tributaries in the Bill Williams River system are greater than 100 feet per mile.

The drainage area consists essentially of broad desert valleys and irregularly distributed ranges of rugged mountains. Relief is moderate to high. Elevations in the drainage area vary from about 990 ft above sea level at the base of the dam to 8,226 ft at Hualpai Peak on the northwest boundary.

The Bill Williams River is a perennial stream, although subterranean in some reaches. The longest segment is between Lincoln Ranch and Planet Ranch, a distance of approximately 23 river miles.
The climate is typically desert in character over the lower elevations of the basin, with short, mild winters and long, hot summers. In the higher elevations, the summers are milder, and the winters are colder and longer. The Alamo Basin has two distinct rainfall seasons: winter and summer, with a dry fall and a very dry late spring. The heaviest precipitation occurs in the summer, with about one-third of the annual precipitation normally occurring in July and August and one-half during the fall and winter months. The driest time of the year is later spring.

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Salt River basin is located in northeast Missouri, covering approximately 2,881 square miles of area. The headwaters are located within Schuyler County less than 15 miles north of the town of Kirksville, Missouri. The basin generally flows south and then turns east and flows to its outlet at the confluence with the Mississippi River near the town of Louisiana, Missouri. The watershed is a gently undulating plain in the upstream portion and it becomes more rolling and hilly in the downstream reaches. High rock bluffs border the streams at various locations. The river valleys are characterized by fairly narrow, tortuous courses interspersed by areas of widened bottomlands. Nearly the entire basin is located within the Central Claypan region, meaning soils in the basin are generally deep with a silt loam surface overlying a silty clay subsoil of very low permeability. The primary land use in the basin is agriculture; however there are some urbanized areas within the basin, including the towns of Kirksville, Mexico, Shelbina, Moberly, Paris, and New London. The only USACE dam within the basin is Clarence Cannon Dam, which impounds water to form Mark Twain Lake. Approximately 80% of the drainage area within the Salt River basin is controlled by the dam. Clarence Cannon Dam has several project purposes, including flood control, hydroelectric power generation, water supply, fish and wildlife, recreation, and incidental navigation on the Mississippi River.

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The District currently utilizes a SSARR model for routing flow through the basin. This model will be utilized as a calibration tool during the development of the CWMS model

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Missouri River downstream of the Platte River will not be modeled at this time, but will be in the future as resources are available. The reason it was not included was because of the large contribution from the Kansas River and the associated dams, which was outside of the scope of Smithville Dam. The main constraints from Smithville Dam are located on the Little Platte and Platte River.

ABSTRACT:

See USACE CWMS - Des Moines River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Des Moines River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Rio Grande Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Rio Grande Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Rio Grande Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Sacramento River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Sacramento River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Sacramento River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Upper Susquehanna River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Bill Williams River Watershed Collection Resource

ABSTRACT:

USACE CWMS - Bill Williams River Watershed Bank Lines

ABSTRACT:

See USACE CWMS - Bill Williams River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Bill Williams River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Salt River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Salt River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Salt River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chena River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chena River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chena River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Little Platte River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Little Platte River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Little Platte River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The maximum water level change for Lake Winnebago is about 1.5 ft from winter pool to summer pool. During the summer months, there is only a 0.30 ft operating band that is easily surpassed if heavy thunderstorms move over the lake. The area upstream of Lake Winnebago is quite flat and marshy with several smaller shallow lakes that attenuate the flow. Improved modeling techniques in the CWMS suite of models will improve the peak flow time and volume of water into Lake Winnebago.

The Corps is authorized to regulate outflows from Lake Winnebago for flood capacity. The drawdow provides capacity to contain spring flooding, but the District does not have a tool available to quantify snowmelt. Improving the HMS model to incorporate snowmelt will benefit the District and stakeholders. In past years, the spring water level targets have been surpassed due to rapid snowmelt from rain events. While the primary authorization for regulation is to prevent flooding, the Corps also recognizes other stakeholders such as hydropower, recreational boating, fish, wildlife and wetland habitat concerns. There is a constant balance between all stakeholders.

ABSTRACT:

See USACE CWMS - Des Moines River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Rio Grande Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Sacramento River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

Geography: The Roanoke River Basin is located in the southern part of Virginia and northern part of North Carolina. The river rises on the eastern slope of the Appalachian Mountains, flows 300 miles from Smith Mountain Dam in a southeasterly direction toward the Atlantic Coast, and empties into the Albemarle Sound, approximately 7 miles below Plymouth, NC. The basin is about 220 miles long and from 10 to 100 miles wide. Parts of 15 counties in Virginia and 17 counties in North Carolina are included in the watershed.

Drainage: The Roanoke River drains 9,580 square miles, of which 7,800 square miles is above John H Kerr Dam and 212 square miles is above Philpott Dam. The Dan River, the largest tributary, empties into the Roanoke at Clarksville, VA. Areas drained by the Dan and Upper Roanoke at this point are 3,855 and 3,465 square miles, respectively. As Williamston, NC, 38 miles above the mouth, the stream is affected by the elevation of the water in Albemarle Sound, which has no lunar tides, but whose surface is affected by wind.

Rainfall: The average annual precipitation over the entire basin is about 43 inches with annual extremes of 27 and 56 inches. Precipitation is well distributed throughout the year. The average annual snowfall is about 13 inches and does not accumulate sufficiently to have a noticeable effect on flood flows.

Storm rainfall characteristics: Flood producing storms in the Roanoke River Basin occur in all seasons of the year. Generally floods are caused by brief periods of intense rainfall on a major portion of the watershed. In the late summer and fall, intense rainfall is often associated with tropical hurricanes.

Runoff: The annual runoff from the Roanoke River Basin averages 14 inches or 32 percent of the annual precipitation. The runoff of the Roanoke River Basin, measured near Roanoke Rapids, NC, averages 1.0 cubic feet per second per square mile of watershed area.

Flood Damages: Floods in the Roanoke River Basin cause considerable loss to agricultural interests, urban areas, and to transportation and communication facilities. Although the damages occur throughout the watershed, the major flood losses are confined mainly to the Roanoke, Dan, and Smith Rivers. The flood plains in the Upper Roanoke River Valley and in the Dan and Smith River Valleys are usually narrow and flanked by bluffs which become precipitous in the headwater reaches. Damages from a major flood in these areas are not of major consequence to the agricultural areas are the farm enterprise is mainly situated above the flood plain and is not dependent for its continuity on the crops raised on the bottomlands. Below Weldon the floodplain is from 1 to 6 miles wide and contains about 78 percent of the total area and 61 percent of the agricultural area on the floodplains of the tree main rivers subject to inundation from floods. Practically all the farms in this valley are located on the wide flood plains and are completely inundated by a major flood. The majority of the cities and towns in the watershed are located on high ground.\

Location: John H Kerr Dam is located on the Roanoke River about 180 miles above the mouth, 20 miles downstream of Clarksville, VA, 18 miles upstream from the Virginia-North Carolina State line, and 80 miles southwest of Richmond, the capitol of Virginia.

Purpose: The objectives of regulating the outflow from John H Kerr dam will involve consideration of the following features: flood control, hydroelectric power, mosquito control, pollution abatement and fish and wildlife, navigation, and recreation. The primary objective of the project is flood control and a storage of 1,278,000 acre-feet between elevations 300 ft NGVD and 320 ft NGVD has been reserved exclusively for the detention storage of flood waters. The dam will also operate as a peaking plant. Most of the energy produced will be generated at varying rates during some portion of those hours designated as on-peak by the customers. The remainder of the energy produced will be generated incidental to reservoir regulation of flood flows.

Flow Forecasting: The main objective of forecasting stream flows into the reservoir is (a) to make an early determination of runoff in a flood rise so that releases from the reservoir can be established in accordance with the approval method of reservoir regulation and (b) to determine the amount of runoff assured in normal flows so that a forecast can be made of the water available for power generation.

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

Lake where it flows in a southeasterly direction to empty into the Gulf of Mexico near Freeport, Texas. The Brazos River is the 11th longest river in the United States flowing 1,280 miles. The Brazos River and its principal tributaries Clear Fork Brazos River, Aquilla Creek, Bosque River, Leon River, Lampasas River, Little River, San Gabriel River, Navasota River, and Yegua Creek flow through mostly rural and agricultural areas. The largest urban areas are Waco, Belton, Georgetown, Richmond, and Freeport. The total drainage area of the Brazos River basin is approximately 45,625 square miles. The precipitation varies from west to east and from the north to south portions of the basin. The upper Brazos from the west to the east receives 15 – 30 inches, and from the upper to lower receives 30 – 45 inches, on average, each year. The basin, particularly in the southern basin, can experience extremely intense precipitation events capable of producing staggering rainfall totals. These systems range from intense thunderstorms to hurricanes.

The climate of the Brazos watershed varies considerably from temperate to subtropical. The average annual temperature is 59°F in its upper reaches and 70° in the coastal region. Normally, the winters are mild and short, even in the upper reaches, but severe weather is not unknown. Temperatures of zero and even lower have been recorded. The average annual rainfall is 29.5 inches, ranging from sixteen in the northwest to forty-seven in the southeast. Soil types along the Brazos vary from sandy loams to deep clay. A variety of natural vegetation ranges from scattered oak mottes and bunch grasses in drier areas to conifers and hardwoods in areas where rain is plentiful. Virtually the entire area of the watershed is suitable for some form of farming or ranching activity. The most important products of the region have been cotton, cattle, and oil.

Many reservoirs were constructed in the Brazos Basin, and they are managed for flood control, water supply, recreation, and other uses. Brazos River Authority (BRA) is the primary entity that manages surface water in the Brazos Basin. BRA has water supply contracts with USACE in all nine USACE reservoirs; Lake Whitney, Aquilla Lake, Waco Lake, Proctor Lake, Belton Lake, Stillhouse Hollow Lake, Georgetown Lake Granger Lake, and Somerville Lake. Additionally BRA operated three large water supply reservoirs that have impacts on USACE Water Management Operations; Possum Kingdom Lake, Lake Granbury, and Lake Limestone.

During non-flood control operation, the USACE reservoirs are operated for water supply requests from BRA. During flood control operations, the USACE reservoirs are operated to multiple downstream USGS gages to provide a balanced system approach of the USACE flood storage and the local water supply reservoir releases. Priority is first given to the local water supply reservoir releases at the downstream USGS gage locations.

The Brazos River supports Dow Chemical, one of the largest manufacturers of chemicals and plastics in the world. Dow has senior water rights on the Brazos to 48 billion gallons of water a year. In recent drought years Dow has requested Texas Commission on Environmental Quality (TCEQ) to suspend the junior rights of farmers, municipalities, and other users upstream to ensure their water demands are met.

ABSTRACT:

See USACE CWMS - Bill Williams River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Roanoke River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Roanoke River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Roanoke River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Roanoke River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Roanoke River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Roanoke River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Roanoke River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Brazos River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Salt River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Little Platte River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chena River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Lake Winnebago Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Lake Winnebago Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Lake Winnebago Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Lake Winnebago Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Lake Winnebago Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Savannah River basin is long and relatively narrow, with the long axis lying in a northwest-southeast direction. The Savannah River, along with some of its tributaries, forms the border between the states of Georgia and South Carolina. The Savannah River drains 5,870 square miles of eastern Georgia, 4,530 square miles of western South Carolina, and 179 square miles of southern North Carolina for a total of 10,579 square miles. Like other basins of large rivers in the Southeast which flow into the Atlantic Ocean, the Savannah River Basin embraces three distinct areas: the mountain section, the Piedmont Province and the Coastal Plain. Elevations in the basin range from sea level at Savannah to approximately 5,030 feet at Little Bald in North Carolina. The Savannah River is formed in the Piedmont region by the confluence of the Seneca and Tugaloo Rivers. This confluence was formerly known as “The Forks”, but is currently inundated beneath Lake Hartwell. The Savannah River crosses the Atlantic Seaboard fall line at Augusta, where it enters the Atlantic Coastal plain. Downstream of Augusta, the river becomes more sinuous and meanders across its flood plain. The lower 50 miles, to just upstream of the confluence with Ebenezer Creek, is tidally influenced. The lower part of the river becomes estuarine before entering the Atlantic Ocean at Tybee Roads.

The river's entire length of 312 miles is regulated by three adjoining Corps of Engineers multipurpose projects, each with appreciable storage. The three lakes, Hartwell, Richard B. Russell and J. Strom Thurmond, form a chain along the Georgia-South Carolina border 120 miles long. Of the 6,144 square mile drainage basin above Thurmond Dam, 3,254 square miles (53%) are between Thurmond and Russell Dams, 802 square miles (13%) are between Russell and Hartwell Dams, and 2,088 square miles (34%) are above Hartwell Dam. Hartwell Dam is at River Mile 305.0, 7 miles east of Hartwell, Georgia. When the lake level is at elevation 660 ft. NGVD, the top of conservation pool, the reservoir extends 49 miles up the Tugaloo River (Georgia), and 45 miles up the Seneca and Keowee Rivers (South Carolina). The shoreline at elevation 660 is about 962 miles long, excluding island areas. The reservoir has a total storage capacity of 2,550,000 acre-feet below elevation 660 ft. Russell Dam is at River Mile 275.2 in Elbert County, Georgia and Abbeville County, South Carolina. The dam is 18 miles southwest of Elberton, Georgia, 4 miles southwest of Calhoun Falls, South Carolina, and 40 miles northeast of Athens, Georgia. At top of conservation pool, elevation 475, the reservoir has a useable storage capacity of 126,800 acre-feet and 1,166,166 acre-feet of total storage at top of flood control pool, elevation 480. Richard B. Russell Dam was the third multiple-purpose project that the Federal Government built in the basin. Operation of the project began in January 1985. Thurmond Dam is at River Mile 237.7, on the Savannah River, 22 miles upstream of Augusta, Georgia. The reservoir at top of the flood control pool, elevation 335, has an area of 78,500 acres. At elevation 330, top of conservation pool, the reservoir extends about 40 miles up the Savannah River and about 30 miles up Little River (Georgia), and has about 1,050 miles of shoreline, excluding island areas. The reservoir has a total storage capacity of 2,510,000 acre-feet below elevation 330. The river is largely inundated between Hartwell Dam and Thurmond Dam, only flowing free for a two mile stretch below Hartwell Dam.

ABSTRACT:

See USACE CWMS - Brazos River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Brazos River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Upper Susquehanna River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Upper Susquehanna River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Upper Susquehanna River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Upper Susquehanna River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Rio Grande Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Rio Grande Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Sacramento River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Sacramento River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Salt River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Little Platte River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Blackstone River Basin is located within the states of Massachusetts and Rhode Island. Of the 547 square miles that make up the basin, 147 square miles, or 27% of the basin, is in Rhode Island. About 400 square miles or 73% of the basin is located in Massachusetts. The basin is heavily urbanized characterized by a hilly terrain comprised of lakes and ponds. Elevations within the Blackstone River Basin range from 1200 feet in the northwest to about 3 feet above mean sea level at the mouth of the Seekonk River.

The coastal location of the Blackstone River basin exposes it to the effects of cyclonic disturbances and coastal storms in the region, resulting in periods of heavy precipitation. On an average, this basin receives approximately 48 inches of rainfall annually. The average annual snowfall in Worcester, MA is about 64 inches, which is representative of the headwaters of the Blackstone River Basin.The average annual snowfall in Providence, RI near the mouth of the Seekonk River is 346 inches.

Blackstone River extends from its headwaters in Worcester MA to its confluence with Abbott Run in Central Falls RI creating the Seekonk River. The Seekonk River discharges into the Providence River eventually draining into the Narragansett Bay. Some of the major tributaries to the Blackstone River include Quinsigamond River, Mumford River, West River, Branch River, Mill River and Peters River
The key inflow gages in the Blackstone River basin include Kettle Brook at Rockland Street near Auburn MA, Quinsigamond River at North Grafton MA, Mumford River at Uxbridge MA, West River below West Hill Dam near Uxbridge MA, Branch River at Forestdale RI, Mill River at Harris PD Outlet at Woonsocket RI, Peters River RT 114 Bridge at Woonsocket RI and Abbott Run at Valley Falls RI.

There are two USACE dams located within the Blackstone River Basin. They include the West Hill Dam on the West River and Woonsocket Falls on the Blackstone River. West Hill Dam is a dry reservoir that is typically run of river. Channel capacity of Mill Creek in this area is 425 cfs. Woonsocket Falls Dam was modified with tainter gates to control reservoir stages. A hydropower facility pulls water from the reservoir and discharges the same flow back into the Blackstone River channel downstream of the Woonsocket Falls gates.

The Blackstone River basin land use is largerly characterized by forest land (52% of the basin area) and residential development (22% of the basin area) with significant industrial development along the Blackstone River in Worcester MA, Woonsocket RI, Pawtucket RI and Central Falls RI. Much of the water-powered industrial development along the rivers in the Blackstone River basin stemmed from the first successful textile mill in America, the Slater Mill in Pawtucket RI constructed in 1793.Less than 2% of the basin’s land use is considered cropland or agricultural.

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Blackstone River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Savannah River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Savannah River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Savannah River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Savannah River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Savannah River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Savannah River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Savannah River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

ABSTRACT:

See USACE CWMS - Okatibbee River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Okatibbee River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Okatibbee River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Okatibbee River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Okatibbee River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Black Warrior-Tombigbee (BWT) River basin drains approximately 21,500 square miles, including a large portion of northeast Mississippi and approximately one third of the state of Alabama. The Black Warrior-Tombigbee drainage basin includes part or all of 29 counties in Alabama and Mississippi, with a combined population of several million. The basin is roughly triangular in shape, and is approximately 290 miles long with a width that varies from about 200 miles near the top of the basin to about 30 miles near the outlet. The Black Warrior River is formed about 20 miles west of Birmingham, Alabama, by the union of the Locust and Mulberry Forks, and from there flows in a generally southwesterly direction to its confluence with the Tombigbee River near Demopolis, Alabama. The Tombigbee River flows to near Calvert, Alabama, where it joins the Alabama River to form the Mobile River. Water resources in the BWT Basin have been managed to serve a variety of purposes including navigation, hydroelectric power, flood risk management, water supply, and water quality.

The Black Warrior River Basin is a 6,274 square mile watershed with headwaters originating in the Cumberland Plateau, just west of Birmingham, Alabama. From the confluence of the Locust and Mulberry Forks, the Black Warrior River flows generally southwest 45 miles to Tuscaloosa and then 130 miles to its confluence with the Tombigbee River at Demopolis. The three main headwater tributaries of the Black Warrior River are the Locust, Mulberry, and Sipsey Forks. The Sipsey Fork flows into the Mulberry fork approximately 44 miles above the confluence of the Mulberry Fork and Locust Fork, which form the Black Warrior River. Other major tributaries are North River and Blackwater, Lost, Village, and Valley creeks. From its headwater tributaries to about Tuscaloosa, Alabama, the Black Warrior River flows through deep narrow valleys and gorges in terrain that ranges from hilly to mountainous. Located entirely in this rugged country, the Locust, Mulberry, and Sipsey Forks have average slopes of approximately 3.5, 2, and 7 feet per mile, respectively. Channel capacities are 15,000 cfs on the Locust Fork at Sayre and 34,000 cfs on the Mulberry Fork at Cordova. From its confluence through this hill country, the Black Warrior River has an average slope of 2.7 feet per mile, relatively high banks, and an average channel width of about 800 feet. Below Tuscaloosa, the river crosses the fall line into the coastal plain, and the topography changes abruptly, resulting in relatively flat slopes, lower banks, and wider flood plains. The average slope of the Black Warrior River below Tuscaloosa to the confluence with the Tombigbee is about 0.5 feet per mile. The channel capacity at Tuscaloosa is about 65,000 cfs.

Along the Black Warrior River below Tuscaloosa, the flood plain averages about 4 miles in width and contains a mixture of agricultural and wooded lands. The primary agricultural use is pasture, but corn, cotton, hay, and many native crops are also grown in the flood plain. In the vicinity of Tuscaloosa and above Tuscaloosa the flood plain is generally 1 mile in width or narrower. The area above Tuscaloosa is also primarily farm land, however in the upper part of the Black Warrior basin there is a highly developed industrial area, concentrated mainly in the Birmingham region. The principal industry in the area is the production of primary metals and related by-products.

ABSTRACT:

See USACE CWMS - Black Warrior Tombigbee Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Black Warrior Tombigbee Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Black Warrior Tombigbee Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Black Warrior Tombigbee Watershed Collection Resource

ABSTRACT:

The study area is an approximate polygon created for the pre-model data set to determine the extents and build the initial depth grid and hillshading raster data sets. The rough study area allows the mapper and modeler alike to visualize an estimated effected area.

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

ABSTRACT:

See USACE CWMS - Red River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Skagit River basin is located in the northwest corner of the State of Washington. The Skagit River basin extends about 110 miles in the north-south direction and about 90 miles in the east-west direction between the crest of the Cascade Range and Puget Sound. The northern end of the basin extends 28 miles into Canada.

The Skagit River originates in a network of narrow, precipitous mountain canyons in Canada and flows west and south into the United States where it continues 135 miles to Skagit Bay. The Skagit River falls rapidly from its source at an elevation of about 8,000 ft to 1,600 ft at the United States-Canadian Border. Within the first 40-miles south of the International Border, the river falls a further 1,100 feet and the remaining 500 feet of fall is distributed along the 95 miles of the lower river. Downstream from Sedro-Woolley, the valley descends to nearly sea level and widens to a flat, fertile floodplain and delta with an east-west width of about 11 miles and a north-south width of about 19 miles. The floodplain and delta joins the Samish River valley to the north, and extends west through Burlington and Mount Vernon to La Conner, and south to the Stillaguamish River. Between Sedro-Woolley and Mount Vernon, a large area of floodplain provides natural storage, primarily in the lower Nookachamps Creek Basin along the left overbank of the Skagit River. For very high river flows, a portion of the Skagit River in this reach can overflow the right bank and escape out of the system through Burlington to Padilla Bay and to Samish Bay. This overflow area is commonly referred to as the “Sterling Spill.”

The Skagit River continues through a broad outwash plain in the lower reach nearest the river mouth and divides between two principal distributaries, the North Fork and the South Fork, which are approximately 7.3 and 8.1 miles long, respectively. About 60 percent of the discharge is carried by the North Fork and the remainder is carried by the South Fork during lower flows, but this split becomes closer to 50-50 for higher flows.

The upper basin is mountainous, largely forested, and sparsely populated. Almost 90 percent of the upper basin is either designated as national forest or national park (Ross Lake National Recreation Area and portions of the North Cascades National Park and the Mt. Baker Snoqualmie National Forest). There are three major tributary rivers to the Skagit: Sauk-Suiattle, Cascade, and Baker. The Sauk-Suiattle and the Cascade Rivers are designated as wild and scenic and their flows are not controlled by dams or other structures. The Upper and Lower Baker Dams (together, the Baker River Hydroelectric Project) located on the Baker River are owned and operated by Puget Sound Energy (PSE), a private power utility. The USACE is authorized to use flood control storage in Upper Baker Dam. Ross Dam is located on the Skagit River and owned by Seattle City Light (SCL), a public power utility. The USACE is authorized to use flood control storage in at Ross Dam.

In the lower basin, the Skagit Valley, the 100,000-acre valley area downstream from the town of Concrete, contains the largest residential and farming developments in the basin. The 32-mile long valley between Concrete and Sedro-Woolley is from 1 to 3 miles wide, with mostly cattle and dairy pasture land and wooded areas. The valley walls in this section are steeply rising timbered hills.

In a large flood, the majority of the potential economic damages and potential threats to life safety would be located in the Skagit River floodplain, downstream of the city of Sedro-Woolley (population 11,000) in the cities of Burlington (population 8,700) and Mount Vernon (population 32,100). Critical infrastructure in Sedro-Woolley includes State Routes (SR) 9 and 20 (critical local access routes), United General Hospital, the Sedro-Woolley wastewater treatment plant, and a Life Care assisted living facility. Critical infrastructure in and around Mount Vernon and Burlington includes Interstate 5, Burlington Northern Santa Fe (BNSF) Railroad, SR 20, SR 9, and SR 536), numerous water and gas pipelines, light industry, and municipal infrastructure. The cities and critical infrastructure in the lower basin are protected by a system of levees and reservoirs along the Skagit River, while in the upper basin, levees are limited to areas surrounding critical locations.

ABSTRACT:

See USACE CWMS - Skagit River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Skagit River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Skagit River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Skagit River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Skagit River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The watershed is composed largely of precipitous mountains, and as a whole, is characterized by a highly dissected topography with deep V-shaped valleys, steep slopes, and narrow and sharp top ridges. The topography becomes increasingly rough toward the eastern boundary. The basin above Lucky Peak dam ranges in elevation from 3,000 to 10,500 feet. The mean elevation of the basin is 5,800 feet. The mean annual average precipitation for the basin ranges from 8 inches in the lower basin to 55 inches at the highest elevations; the value at Lucky peak dam is 15 inches.

The principal tributaries of the Boise River and their respective drainage areas are the South Fork, 1,314 square miles; Middle Fork and North Fork, 830 square miles; and Mores Creek, 426 square miles. These four tributaries comprise 97 percent of the drainage area above the Lucky Peak dam.

Major floods are typically categorized as “Winter” or “Spring” floods. Both floods usually have rainfall and snowmelt components. Winter floods are typically less duration and volume than spring floods. During winter the reservoirs are drafted down to allow space for flood events and there are no irrigation demands. In late spring the reservoirs are being filled to meet “refill requirements” for irrigation by following rule curves. Rule curves define required system flood control spaces as functions of date and operations runoff volume forecasts. A large rainfall system in conjunction with final filling of the reservoirs causes the largest risk to flood flows downstream of the reservoir system.

There are three reservoirs in the drainage area above Lucky Peak Dam; namely, Little Camas, Anderson Ranch, and Arrowrock. Little Camas Reservoir is located 22 miles northeast of Mountain Home, Idaho, on Camas Creek, a tributary of South Fork Boise River. The reservoir has a usable capacity of about 22,000 acre-feet, which is used exclusively for irrigation. This reservoir has no value for flood control and is not considered for USACE operations. Therefore, Little Camas Dam will not be modeled in HMS or ResSim. Anderson Ranch Reservoir is about 30 miles northeast of Mountain Home, Idaho, on the South Fork Boise River. The reservoir has a usable capacity of 418,000 acre-feet, which is joint use for flood control and irrigation. Arrowrock Reservoir, built by the U.S. Bureau of Reclamation for irrigation purposes, is about 22 miles east of Boise, Idaho, on the Boise River below the confluence of the South Fork and the main Boise River. The reservoir has a usable capacity of 286,000 acre-feet, which is joint use for flood control and irrigation. Lucky Peak Reservoir is about 10 miles east of Boise, Idaho, on the Boise River below the confluence of Mores Creek and the Boise River. The reservoir has a useable capacity of 264,000 acre-feet, which is joint use for flood control and irrigation.

The Lucky Peak Dam, built by the U.S. Army Corps of Engineers, is a multi-purpose dam located 9 miles southeast of Boise, Idaho, on the Boise River. The spillway is located south of the da, it is 600 feet long, has training wall abutments at each end, is made of reinforced concrete, and has an ogee shape with an apron on the downstream side. The crest of the spillway is at elevation 3063.3. Discharge over the spillway is uncontrolled and travels over the unlined open hillside to the river below the project structures. At a maximum design pool elevation of 3075.3, approximately 93,300 cfs would be passed over the spillway. The spillway is for emergency use only and should never be used for normal operations, since use of the spillway is expected to severely erode the unlined hillside below the spillway. To prevent overtopping the spillway, either accidentally or by wave action, the reservoir pool must be maintained at elevations below 3063.3.

ABSTRACT:

See USACE CWMS - Boise River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Boise River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Boise River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Boise River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Boise River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The James River basin has one of the smallest gradients of any river in the country. This affects the conveyance of water and impacts the hydraulics during high flows.

ABSTRACT:

See USACE CWMS - James River ND Watershed Collection Resource

ABSTRACT:

See USACE CWMS - James River ND Watershed Collection Resource

ABSTRACT:

See USACE CWMS - James River ND Watershed Collection Resource

ABSTRACT:

See USACE CWMS - James River ND Watershed Collection Resource

ABSTRACT:

See USACE CWMS - James River ND Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

ABSTRACT:

See USACE CWMS - Chariton River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chariton River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chariton River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chariton River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chariton River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Iowa River basin is the second largest basin in the state of Iowa, covering approximately 12,640 square miles. The headwaters originate at in Hancock County, IA. Spanning almost the entire state from North to South, the basin generally flows in a southeasterly direction and drains to the Mississippi River, with the outlet located just upstream of the city of New Boston, Illinois. The basin is roughly 360 miles long and has an average width of 55 miles. The Iowa River has a mildly sinuous channel with low banks and a small slope. During times of heavy rains, the valleys in the basin can be subjected to serious flooding as was seen in the 2008 flood of record. The primary land use in the basin is agriculture. The largest urbanized areas in the watershed (population over 10,000), include Iowa City, Coralville, Cedar Rapids, Waterloo, Cedar Falls, Mason City, and Marshalltown. There are also several other small towns located along the banks of the Iowa River and spread throughout the basin.

There is one reservoir constructed and operated by the US Army Corps of Engineers in the watershed: Coralville Lake. The dam is located on the main stem of the Iowa River and is operated by the Rock Island District. The primary purpose of the reservoir is to provide flood damage reduction and low flow augmentation for the lower Iowa River. The secondary benefits of the reservoir include enhancing recreational opportunities, providing fish and wildlife conservation, and improving land use management. There are no Locks located along the Iowa River as there is not sufficient width or depth for a navigation channel.

ABSTRACT:

See USACE CWMS - Iowa River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Iowa River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Iowa River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Iowa River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Iowa River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Des Moines River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The White River Basin contains 27,818 square miles: about 38 percent is in Missouri and 62 percent is in Arkansas. The fan-shaped basin is about 250 miles long in a northerly direction and varies in width from 210 miles near the Missouri-Arkansas State line to about 50 miles near the mouth of the river. Approximately three-fourths of the basin is in the Ozark highlands where the topography consists of rough dissected plateaus rugged hills, and rolling woodland. The eastern escarpment of the Ozark Mountains extends southwestward across the basin from the vicinity of Poplar Bluff, MO; along the west side of the Black River to Batesville, AR, on the White River; and thence to the vicinity of Searcy, AR, in the little Red River Basin. East of the escarpment, the basin lies in the flat terrain of the Gulf Coastal Plain. The eastern watershed divide between the White and St. Francis Rivers is formed by Crowley’s’ Ridge, which extends in a north-south direction and rises about 150 feet above the floodplain.

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Kentucky River is formed in eastern Kentucky at Beattyville, in Lee County, by the confluence of the North, Middle and South Forks at about 670 feet (200 m) elevation, and flows generally northwest, in a highly meandering course through the mountains, through the Daniel Boone National Forest, then past Irvine and Boonesborough, then southwest, passing south of Lexington, then north through Frankfort. It joins the Ohio at Carrollton.

The North Fork Kentucky River is approximately 168 miles (270 km) long. It rises on the western side of Pine Mountain, in the Appalachians of extreme southeastern Kentucky, in eastern Letcher County near the Virginia state line in Payne Gap, near the intersection of US 23 and US 119. It flows generally northwest, in a winding course through the mountainous Cumberland Plateau, past Whitesburg, Hazard and Jackson. It receives Rockhouse Creek at Blackey near its source. Approximately 8 miles (13 km) southeast of Hazard, it receives the Carr Fork. It receives Troublesome Creek at Haddix, southeast of Jackson. Three miles upstream from its confluence with the South Fork, it receives the Middle Fork. It joins the South Fork to form the Kentucky at Beattyville.

The Middle Fork Kentucky River is a tributary of the North Fork Kentucky River, approximately 105 miles (169 km) long, in southeastern Kentucky. It rises in the Appalachian Mountains in southernmost Leslie County, approximately 16 miles (26 km) from the Virginia state line, and flows north through the Cumberland Plateau past Hyden. At Buckhorn, it is impounded to form the Buckhorn Lake reservoir. North of the reservoir it flows generally northwest and joins the North Fork in Lee County, approximately 5 miles (8 km) east of the confluence of the North and South forks at Beattyville.

The South Fork Kentucky River is approximately 45 miles (72 km) long. It is formed in Clay County, at the town of Oneida in the Daniel Boone National Forest, approximately 10 miles (16 km) northeast of Manchester, by the confluence of Goose Creek and the Red Bird River. It flows generally north in a highly meandering course through the mountainous Cumberland Plateau region. It joins the North Fork to form the Kentucky at Beattyville.

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Kansas River watershed rises in eastern Colorado with portions of the Republican and Smoky Hill River drainages in that state. The Smoky Hill and Republican Rivers along with their tributaries flow generally eastward across western Kansas to Junction City, KS where they join to form the Kansas River. From Junction City, the Kansas River flows eastward until it joins the Missouri River at Kansas City. Other major tributaries to the Kansas River include the Big Blue, Delaware, and Wakarusa Rivers. Average annual precipitation in the basin varies from less than 16 inches in eastern Colorado to 39 inches at Kansas City. Floods generally occur due to convective storms in the spring and summer months, however large floods can be caused by extended wet periods.

the Smoky Hill River below Kanopolis Dam. Junction City sits at the confluence that forms the Kansas River. Fort Riley, a prominent army post is located near Junction City, and three levee systems protect portions of the post from flooding from the Republican and Kansas Rivers. Downstream, large communities along the Kansas include Manhattan, Topeka, the state capital, Lawrence and Kansas City. Each of these cities contain areas protected by major levees.

ABSTRACT:

See USACE CWMS - Kentucky River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kentucky River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kentucky River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kentucky River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kentucky River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kansas River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kansas River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kansas River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kansas River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kansas River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Kansas River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Minnesota River is approximately 332 miles long, and it drains a basin of about 14,751 square miles in size. The Minnesota River flows over a mantle of glacial drift from an elevation of 960 feet in the headwaters near the South Dakota border, to the confluence with the Mississippi River at an elevation of about 690 feet at Minneapolis/St. Paul. The Minnesota River is a remnant from melting glaciers after the last ice age. Originally the valley drained north; however, glacial deposits and refreezing of the area over time formed a southern outlet into what is now the Minnesota and Mississippi Rivers. Several diversion channels exist within the Minnesota River Valley and some of them are utilized in the Lac Qui Parle project as the Chippewa Diversion and Watson Sag (Minnesota NRCS November 2014).

The soil across the basin is rich in nutrients, so that 90% of land use is used for some form of agricultural production. The fertile, black, fine-grained soils and landscape are conducive to agriculture. The principal crops are wheat, barley, soybeans, sunflowers, corn, and hay. Pasture, forest, open water, and wetlands comprise most of the remaining land area.

After a long winter, temperatures typically rise above freezing across the southern basin, resulting in snowmelt and eventual runoff into the river system. As the swollen river flows north, it encounters less slope, greater amounts of snow and ice due to a colder air mass, and delayed seasonal melting. Ice jams commonly result from these factors and in turn, impedes flow and holds back excessive water. Since the river channel itself is shallow and no more than a few hundred yards at its widest point, water quickly spreads out across the surrounding landscape. The severity of spring flooding depends on several hydrometerological factors, including: freeze/melt cycle; early spring rains or late spring snow storms; snow pack depth and liquid water equivalency; frost depth; soil moisture content; river baseflows and ice conditions; and liquid precipitation from the previous year.

ABSTRACT:

See USACE CWMS - Minnesota River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Minnesota River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Minnesota River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Gila River Basin has a drainage area totaling 57,807 square miles. It includes most of southern Arizona and also extends into New Mexico, Mexico, and California. Principle tributaries to the Gila River Basin include the Gila River, Salt River, Verde River, Agua Fria River, Santa Rosa Wash, and Santa Cruz River. Queen Creek is also included to account for the Corps project along this channel.

The counties which are affected and directly benefit by the operation of the reservoirs within the Gila Basin include a small part of Maricopa County along the Gila River, a major part of Yuma County along the Lower Gila River and Colorado River, and a part of Imperial County in California west of the Colorado River. The properties encompassed in these areas include residential developments, agricultural farmlands, industrial operations, commercial outfits, irrigation and drainage works, transportation facilities (roads, highways and railroads), and important defense installations. In addition to the Yuma Metropolitan area, other cities and towns protected by Painted Rock Dam include Tacna, Wellton, Gadsden, Somerton, San Luis, Winterhaven, and Andrade. Much of the northern part of the Gila River Basin is irregular and rugged, with the boundary elevations ranging from about 7,000 feet, NAVD to more than 12,000 feet, NAVD. This part of the basin is mostly drained by the Salt River, which joins the Gila River at river mile 198 near Phoenix. The southeastern part of the basin consists largely of long desert valleys lying between north-south ranges of rugged mountains; the elevations are generally lower but in places are above 10,000 feet, NAVD. The southwestern third of the basin consists essentially of broad, flat, low-lying desert valleys and isolated mountains of relatively low relief; comparatively few localities are more than 4,000 feet, NAVD in elevation, and a large part is below 1,000 feet, NAVD; the elevation of the river mouth near Yuma is approximately 130 feet, NAVD. The Painted Rock Dam site is in the lower part of the basin at river mile 126, with its invert elevation at 530.0 feet, NAVD.

Soils and vegetative types vary widely throughout the basin. In general, the mountains in the Gila River basin are of igneous rock, mostly granitic, schistose, or volcanic. The valleys along the Gila River and its tributaries are alluvial fills of varying depths. The soil in the valleys is fertile, and where water without a high saline content is available for irrigation, the crop yields are high. The type, density, and distribution of vegetation in the Gila River basin reflect the differences in elevation, temperature, and precipitation. The desert vegetation is sparse and composed principally of cacti, creosote bush, and sagebrush. Mesquite, salt cedar, and arrow-weed grow in dense thickets in stream bottoms and other areas where the water table is near the ground surface. Grasses interspersed with desert and semidesert shrubs grow at elevations ranging from 3,000 to 8,000 feet, NAVD. Chaparral, oak, pinion, and juniper grow at elevations ranging from 4,000 to 7,000 feet, NAVD. Aspen and conifers, such as fir, spruce, and pine are common above elevations of 6,000 feet, NAVD.

ABSTRACT:

See USACE CWMS - Gila River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Canadian River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Canadian River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Canadian River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Canadian River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Big Muddy River basin is located in Southern Illinois, covering approximately 2,360 square miles. The headwaters are located within Marion County near the town of Kell, Illinois. The basin flows in a southwestern direction towards the outlet at the confluence with the Mississippi River in Jackson County, approximately 4 miles south of the town of Grand Tower, Illinois. The topography of the basin is characterized by hilly upland terrain and broad, almost flat lowlands along the principal streams. Maximum topographic relief varies from approximately 620 feet near the headwaters to 350 feet at the confluence with the Mississippi River. The major tributaries to Rend Lake are Casey Fork, Rayse Creek, and the Big Muddy River. Downstream of the dam, the major tributaries are the Middle Fork of the Big Muddy River, Little Muddy River, Crab Orchard Creek, and Beaucoup Creek. Soils in the basin were predominantly deposited by the succession of continental glaciers that advanced and retreated across the area during the Great Ice Age. These sediments fall into three major categories: till, lacustrine deposits, and outwash sediments. Loess soils can also be found within the basin. In general, the soils in the basin are rich in organic matter and help explain the major land use categories: agriculture and forested areas. The climate for the basin is considered moderate and is characterized by hot summers and cool winters. The basin lies within the transitional zone between the humid continental climate type and the humid subtropical climate type, and the area experiences four distinct seasons. Average annual rainfall is approximately 45 inches across the basin, and typically the maximum precipitation occurs in the spring (April, May, and June) and again in late November.

ABSTRACT:

See USACE CWMS - Big Muddy River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Big Muddy River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

Genesee River rises in the Allegheny Mountains in Potter County, PA, and flows generally north for about 157 river miles to empty into Lake Ontario at Rochester Harbor, NY. The basin is about 100 miles long and has a maximum width of about 40 miles. The total basin area is 2,466 square miles, of which 1,080 square miles is above the dam. The topography of the southern portion of the basin, above the dam, is steep and rugged, while the lower portion of the basin is gently rolling. Damaging floods on the Genesee Basin have occurred in all months of the year except August. Summer floods are generally localized, and are usually the result of unstable air conditions. Winter and spring floods are usually the result of frontal precipitation on saturated or frozen ground, or on melting snow cover, although floods have been caused from melting snow cover alone. Prevailing winds at various stations range from south to northwest. Average annual precipitation on the basin varies from approximately 25 to 40 inches, with sharp differences between the western rim and the central part of the valley.

Mt. Morris Dam was authorized in 1944 and completed in 1951, and first used for flood regulation on November 24, 1951. Mt Morris Dam is located approximately 67 river miles above the mouth of the Genesee River in Livingston County, NY, and about 4 miles west of the village of Mt. Morris. Mt. Morris Dam is a concrete gravity dam whose primary purpose is reduction of flood damage in the lower
Genesee River. The overall length of the dam is 1,028 feet, with a top width of 20 feet, bottom width of 212.8 feet, and maximum height above the streambed of 215 feet. The uncontrolled ogee overflow
spillway is 550 feet long and located in the center of the dam with a crest elevation of 760.0 feet (NAVD 29). Nine rectangular outlet conduits, each with a 5 foot wide by 7 foot high minimum cross section, are located at the base of the spillway section.

Mt. Morris Reservoir is contained entirely in the deep and narrow valley of the Genesee River between Mt. Morris and the lower Portage Falls. Below the falls, the river flows through a constricted valley for 1.5 miles then through a narrow canyon over 500 feet deep and 3 miles long known as the Portage High Banks. The next 5 miles are through the narrow St. Helena Valley and then through another gorge section, known as Mt. Morris Canyon, for 7 miles to the Mt. Morris Dam. At the top of flood control pool, elevation 760.0 feet (NAVD 29), the reservoir has a total length of approximately 17 miles and a maximum width of about ½ mile. The total storage at top of flood control pool is 337, 400 acre-feet. The area at full pool is 3,300 acres. The reservoir area is rugged and undeveloped, and approximately 50 percent wooded.

ABSTRACT:

See USACE CWMS - Genesee River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Genesee River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Genesee River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Genesee River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Chemung River Basin is located within the states ofPennsylvania and New York. Of the 2,595 square miles that make up the basin, approximately 1,742
square miles or 67% of the basin is in New York with the remaining 853 square miles or 33% within Pennsylvania. The basin is characterized by rolling to flat-topped uplands with steep alluvial valleys.

The Chemung River extends for 46 miles from its headwaters near Painted Post in Steuben County, NY where it is formed by the confluence of the Cohocton and Tioga Rivers, to its confluence with the Susquehanna River in Pennsylvania. Besides the Tioga and Cohocton Rivers, its major tributaries include Canisteo and Cowanesque Rivers.

According to the 2010 census, the population of the Chemung River basin is approximately 223,450, which is about 5.4% of the total Susquehanna River Watershed population. Majority of the population (about 81%) resides in the portion of the watershed that lies within New York. The major population centers in New York include the cities of Hornell, Corning and Elmira. There are several levee systems within the Chemung River basin – Avoca, Addison, Bath, Corning, Painted Post, Gang Mills, Canisteo, and Elmira in New York and Athens, Elkland, Lawrenceville, and
Tioga in Pennsylvania – providing protection to population centers such as the Village of Addison, City of Hornell, Village of Bath, Gang Mills in the Town of Erwin, City of Elmira, Village of Avoca, City of Corning, Villages of Painted Post, Riverside, South Corning, Village of Canisteo in New York, and Cities of
Elkland, Lawrenceville, and Tioga in Pennsylvania.

There are five USACE dams in the Chemung River basin - Almond Dam located on Canacadea Creek, Arkport Dam located on Canisteo River, Cowanesque Dam located on the Cowanesque River, Tioga Dam located on the Tioga River, and Hammond Dam located on Crooked Creek.

ABSTRACT:

See USACE CWMS - Chemung River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chemung River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chemung River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chemung River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Chemung River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Juniata River Watershed is located entirely within the state of Pennsylvania. The watershed is predominately rural, characterized by a heavily wooded, hilly terrain. Elevations within the Juniata River Basin range from 3,000 feet above sea level in the Allegheny Mountains to about 340 feet above sea level at the Juniata River’s confluence with the Susquehanna River.
On an average, this basin receives approximately 41 inches of rainfall annually. The average annual snowfall is about 25 inches. The average high and low temperatures in the watershed are along the lines of 84 and 20 degrees, Fahrenheit.

The Juniata River extends from its headwaters on the eastern slopes of the Allegheny Front, part of the Continental Divide, through the Ridge and Valley Province for 150 miles eventually draining into the Susquehanna River. The three main tributaries to the Juniata River are the Little Juniata, Frankstown Branch Juniata, and Raystown Branch Juniata Rivers.
The key streamgages in the Juniata River watershed include Juniata River at Huntingdon PA (USGS 01559000), Raystown Branch Juniata River Below Raystown Dam near Huntingdon PA (USGS 01563200), Kishacoquillas Creek at Reedsville PA (USGS 01565000), Tuscarora Creek near Port Royal PA (USGS 01566000), Juniata River at Mapleton Depot PA (USGS 01563500), Juniata River at Lewistown PA (USGS 01564895), and Juniata River at Newport PA (USGS 01567000).

Raystown Dam is the only USACE dam located within the Juniata River Watershed. It is located on the Raystown Branch Juniata River approximately 5.5 miles upstream of the confluence with the Juniata River and 97 miles upstream of the confluence of the Juniata and Susquehanna Rivers. The primary purpose of Raystown Dam is to provide flood control downstream. The dam’s secondary purposes include water quality control and low flow augmentation for warm weather fisheries, recreation, and non-Federal hydropower.

The Juniata River basin land use is largely characterized by forest land (70% of the watershed area) and agricultural land (20% of the watershed area). Approximately 1% of the basin area is considered urban developed.

ABSTRACT:

See USACE CWMS - Juniata River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Juniata River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Juniata River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Juniata River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Juniata River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Bighorn River is a right bank tributary of the Yellowstone River with its headwaters located near Dubois, Wyoming in the Wind River Mountain range. The Bighorn River Watershed originates on the eastern slope of the Continental Divide and starts out as the Wind River. It flows in a generally southeasterly direction towards Riverton, WY, then turns north where it flows into Boysen Reservoir.
Approximately 14 miles downstream from Boysen Dam, at the Wedding of the Rivers, Wind River becomes the Bighorn River and continues to flow north towards its confluence with the Yellowstone River northeast of Billings, MT, passing through Yellowtail Dam in the lower reach.

The drainage basin of the Bighorn River encompasses an area of about 22,900 square miles. Boysen Reservoir on the Wind River has a drainage area of approximately 7,700 square miles. The downstream Bighorn Lake formed by Yellowtail Dam has a drainage area of approximately 19,600 square miles. The topography of the basin varies greatly; ranging from mountainous terrain with peak elevations in the Wind River Range over 13,800 feet to rolling foothills and high plains with elevations near 2,700 feet at the confluence with the Yellowstone River.

ABSTRACT:

See USACE CWMS - Bighorn River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

ABSTRACT:

See USACE CWMS - Big Sandy River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Big Sandy River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Big Sandy River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Big Sandy River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Big Sandy River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Main Stem Susquehanna River Watershed combines what is commonly referred to as the Middle and Lower Susquehanna watersheds and is located almost entirely
within the state of Pennsylvania with a small southern portion extending into Maryland. Elevations within the Main Stem Susquehanna River Basin study area range from 2,700 feet above sea level in the northern portion of the watershed to about 220 feet above sea level just downstream of the Marietta stream gage on the Susquehanna River.

In the northern portion of the watershed, the Susquehanna River flows southeast through steep-sided valleys separated by high, flat-topped plateaus. The Susquehanna River then confluences with the Lackawanna River flowing south through Sunbury, PA and on through the middle portion of the watershed characterized by northeast-southwest trending ridges and valleys. The downstream portion of
the watershed, starting along the Susquehanna River near Harrisburg, PA, is characterized by a narrow river valley.

On an average, this basin receives approximately 42 inches of rainfall annually. The average high and low temperatures in the watershed are along the lines of 63 and 44 degrees, Fahrenheit. There are three USACE reservoirs in the Main Stem Susquehanna study area: Stillwater Lake, Aylesworth Creek Lake, and York Indian Rock Dam. Stillwater Lake is located on the Lackawanna River approximately 4 miles upstream of Forest City, PA and 30 miles upstream of Scranton, PA. The primary purpose of Stillwater Lake is to reduce flood damages on the Lackawanna River and Main Stem Susquehanna River to the confluence of West Branch Susquehanna River at Sunbury, PA. A secondary purpose is water supply. Aylesworth Creek Lake is located on Aylesworth Creek approximately 1 mile from the confluence with the Lackawanna River in Jermyn, PA. The purposes of this project are flood risk reduction and water quality.

York Indian Rock Dam is located on Codorus Creek 700 feet upstream of its confluence with South Branch Codorus Creek. It is located about 2.5 miles upstream of York, PA. The primary purpose of York Indian Rock Dam is to reduce flood damages along Codorus Creek downstream of the dam and, to the maximum possible extent, along the Susquehanna River downstream of Marietta. The Main Stem Susquehanna River study area land use is largely characterized by forest land (47% of the watershed area) and agricultural land (36% of the watershed area). Approximately 15% of the basin area is considered urban developed and 2% of the area is considered wetland.

ABSTRACT:

See USACE CWMS - Susquehanna River (Main Stem) Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Susquehanna River (Main Stem) Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Susquehanna River (Main Stem) Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Susquehanna River (Main Stem) Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Susquehanna River (Main Stem) Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Red River watershed originates in the high plains of eastern New Mexico. Flowing southeast across Texas and Louisiana to a point northwest of Baton Rouge, where it enters the Atchafalaya River, which flows south to Atchafalaya Bay and the Gulf of Mexico. The Red River drains an area of some 93,000 square miles (241,000 square km) and has a length of 1,290 miles (2,080 km). The banks of the Red River are highly erosive causing frequent changes to the river channel characteristics as bank caving and sediment deposits occur from each flow event.

The main stem of the Red River flows through two USACE Districts, Tulsa District (SWT) in Southwestern Division (SWD) and Vicksburg District (MVK) in Mississippi Valley Division (MVD). Two other SWD Districts regulate reservoir outflows on tributaries which empty into the Red River. These are Little Rock (SWL) and Fort Worth (SWF) Districts.

The Tulsa District Corps of Engineers operates a total of 14 multi-purpose reservoirs in the Red River watershed from the upper extent of the drainage basin in the high plains of New Mexico through the Texas panhandle along southern Oklahoma and northern Texas to the last Tulsa District Red River regulation point at Fulton, AR. Some of these purposes included flood risk reduction, hydropower, and flood control. Denison Dam (Lake Texoma) is the only reservoir on the main stem of the Red River. There are seven reservoirs in the Red River Basin owned by others which have been built in part with Federal funds to provide flood risk management purposes. Six are U.S. Bureau of Reclamation (USBRA) reservoirs. The legislation authorizing USACE to prescribe the use of storage allocated for flood risk is described in Section 7 of 1944 Flood Control Act. Please refer to Table 2.2.1 for a listing of all reservoirs in the Tulsa District Red River watershed.

ABSTRACT:

See USACE CWMS - Red River Watershed (MVK) Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed (MVK) Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed (MVK) Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed (MVK) Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed (MVK) Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

About 1,100 air miles north of the Gulf of Mexico at an elevation of 1,465 feet above sea level, the outlet of Lake Itaska in north central Minnesota is the origin of the Mississippi River, and the river flows almost 2,400 twisting and turning miles to the Gulf. The Mississippi River starts its journey flowing north, then east, and then in a great sweeping arc turns back to the southwest to Brainerd, Minnesota where the river begins flowing to the south and southeast. The headwaters of the Mississippi River is a region of dense forests, great swamps, and thousands of lakes. Below the Twin Cities, where the Mississippi River is joined by its largest tributary in the St. Paul District, the Minnesota River, the flow is through a valley from one to three miles wide between bluffs which are 200 to 600 feet high. A short distance below St. Paul, the Mississippi River is joined by another large tributary, the St. Croix River. Below Red Wing, Minnesota, the river enters Lake Pepin which was formed by the delta of the Chippewa River, and near the southern limit of the St. Paul District, the Wisconsin River empties into the Mississippi River.

In the St. Paul District, the Mississippi River and its tributaries drain an area of almost 80,000 square miles, of which 45,000 square miles are in Minnesota, 32,000 square miles are in Wisconsin, and the remainder are in South Dakota and Iowa. In this district, the Mississippi River drops almost 60% of its total fall. In the northwestern portion of the State of Minnesota, channels of streams have flat gradients and meander through shallow valleys. In north central Minnesota with its heavy forest cover, flat land slopes, and large storage capacity in lakes, swamps, and reservoirs, there is no serious flood problem. However, in the southeastern part of the State, the tributaries, flowing from the prairies to the main stream, have cut deep gorges through the soft limestones and sandstones which form the bedrock in this area. The relatively high rainfall, averaging up to 32 inches per year combined with the steep gradient of the channels, cause these streams to have occasional flash floods. Soil erosion, silting, large discharges, and high velocity may cause serious problems.

The portion of the watershed modeled by this effort extends from the Twin Cities (Minneapolis – St. Paul metropolitan area) to Guttenberg, IA near Lock and Dam 10. This includes the St. Croix River, Chippewa River, and Wisconsin River. Modeling of the Minnesota River is being completed under a separate CWMS basin modeling effort in FY16.

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVP Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVP Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVP Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVP Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVP Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Mississippi River Basin is the largest river system in the United States, covering approximately 1.15 million square miles, or over 40% of the area of the Continental U.S. Several large tributary rivers flow into the Mississippi, including the Missouri, Ohio, and Arkansas Rivers. Maximum topographic relief varies from approximately 1,475 feet near the headwaters at Lake Itasca to 0 feet at the Gulf of Mexico.
The scope of this project focuses on the Upper Mississippi River (UMR) and delineation of the watershed will be the responsibility of MVP, MVR, and MVS respectively. For the most part, the modeling extents will be divided along district boundaries. However due to hydraulic complications, flood fight activities, and general operations, the area between L/D22 and L/D 24 on the Mississippi and around La Grange L/D on the Illinois will be modeled by both MVS and MVR. The Common Computation Points (CCP’s) for data hand off between districts will be L/D 10 for MVP to MVR and L/D 22 and La Grange L/D for MVR to MVS.

In the Rock Island District, the Mississippi River and its tributaries drain an area of almost 84,500 square miles, however only about 28,900 square miles will be modeled for this project. The remaining areas of the watershed (the Des Moines River basin, the Iowa and Cedar River basin, and the Illinois Waterway) have already been modeled, are in the process of being modeled, or are scheduled to be modeled next year. Most of the watershed is located within Iowa and Illinois with additional contribution areas from Minnesota, Wisconsin, and Missouri. Throughout a majority of the district, the typical floodway ranges between ½ mile to about 1½ miles and is flanked on either side by vast floodplains (up to 10 miles wide) extending to the bluffs. In most areas, a majority of the floodplain has been constricted with agricultural levees and urban development. A prime example of this constriction is located in the Quad Cities downstream of L/D 15 and another one is located just upstream of Hannibal, MO. The extensive system of levees and floodwalls in this section of the Mississippi River will make modeling difficult, especially when the full scope of flood fight activities of this region are taken into account.

From the district boundaries, the basin is roughly 315 miles long and has a maximum width of about 400 miles. The Mississippi River has a mildly sinuous channel with low banks and a small slope. During times of heavy rains, the valleys in the basin can be subjected to serious flooding as was seen in the 1993 and 2008 floods of record. The primary land use in the basin is agriculture. The largest urbanized areas in the watershed (population over 10,000), include Dubuque (IA), Clinton (IA), the Quad Cities Metro Area (IA-IL), Muscatine (IA), Burlington (IA), Fort Madison (IA), Keokuk (IA), Quincy (IL), and Hannibal (MO). There are also several other small towns located along the banks of the Mississippi River and spread along its tributaries throughout the basin.

There are 12 navigation dams located within this section of river that are operated by the Rock Island District. The primary purpose of these locks and dams is to facilitate travel and trade along the river and throughout the Midwest. The dams are primarily used to controlling the water levels during low flow conditions and have a negligible impact in providing flood damage reduction.

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVR Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVR Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVR Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVR Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVR Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Mississippi River Basin is the largest river system in the United States, covering approximately 1.15 million square miles, or over 40% of the area of the Continental U.S. Several large tributary rivers flow into the Mississippi, including the Missouri, Ohio, and Arkansas Rivers. Maximum topographic relief varies from approximately 1,475 feet near the headwaters at Lake Itaska to 0 feet at the Gulf of Mexico. The portion of the Mississippi River Basin that is covered in this CWMS project drains approximately 15,475 square miles.

The Mississippi River in the St. Louis District covers a centerline distance of about 300 miles, flowing generally from the northwest to southeast, from Lock and Dam #22 in Saverton, MO to the mouth of the Ohio River near Cairo, IL. The topography of the basin is characterized by hilly upland terrain and broad, flat floodplain area near the main stem of the river, although there are some areas with steep bluffs above the channel banks. The Mississippi River channel invert ranges in elevation (within the St. Louis District) from about 430 feet at Lock and Dam 22 to about 250 feet at the confluence with the Ohio River. The typical estimated Mississippi River channel invert slope in the District is 0.5 feet per mile. Within the St. Louis District, the main tributaries are the Salt, Cuivre, Illinois, Missouri, Meramec, Kaskaskia, Big Muddy, Castor, and Cache Rivers.

Soils in the basin were predominantly deposited by the succession of continental glaciers that advanced and retreated across the area during the Great Ice Age. These sediments fall into three major categories: till, lacustrine deposits, and outwash sediments. Loess soils can also be found within the basin. In general, the soils in the basin are rich in organic matter and help explain the major land use categories: agriculture and forested areas. The climate for the basin is considered moderate and is characterized by hot summers and cool winters. The basin lies within the humid continental climate, and the area experiences four distinct seasons. Average annual rainfall is approximately 45 inches across the basin, and typically the maximum precipitation occurs in the spring (April, May, and June) and again in late November.

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVS Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVS Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVS Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVS Collection Resource

ABSTRACT:

See USACE CWMS - Mississippi River Watershed MVS Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

Little River rises in the mountainous country of Le Flore County in southeast Oklahoma and is about 217 miles long. It flows in a westerly direction from its source through Le Flore and Pushmataha Counties, Oklahoma, to the McCurtain County line, thence easterly through McCurtain County, Oklahoma, and Sevier County, Arkansas, to a point near Horatio, Arkansas, then it turns southeast to join the Red River near Fulton, Arkansas. The drainage basin is fan-shaped, with a total area of about 4,260 square miles. Five large tributaries join Little River from the north. They are: Glover Creek, drainage area 338 square miles, entering 127.9 miles above the mouth; Mountain Fork River (Broken Bow Lake), drainage area 842 square miles, entering 87.1 miles above the mouth; Rolling Fork River (DeQueen Lake), drainage area 354 square miles, entering 72.9 miles above the mouth; Cossatot River (Gillham Lake), drainage area 530 square miles, entering 43.5 miles above the mouth; and the Saline River (Dierks Lake), drainage area 552 square miles, entering 22.8 miles above themouth. These streams are left bank tributaries, Each of these tributaries and the head waters of Little River flow out of the mountainous area in southeast Oklahoma and southwest Arkansas to the main Little River bottoms, paralleling the Red River in southern Oklahoma and southwestern Arkansas. Nearly 75 percent of the total drainage area is mountainous country covered with a heavy growth of timber. The remaining 25 percent of the drainage area is timbered overflow area and rolling hill country. The elevation of the headwaters of Little River and its tributaries is in excess of 1,000 feet msl. The elevation of the land at the mouth of Little River near Fulton, Arkansas, is about 235 feet msl. There is considerable overflow area on Little River and in the lower reach of each of the five main tributaries. The channel slope varies

ABSTRACT:

See USACE CWMS - Little River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Little River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Little River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Little River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Little River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Red River watershed originates in the high plains of eastern New Mexico. Flowing southeast across Texas and Louisiana to a point northwest of Baton Rouge, where it enters the Atchafalaya River, which
flows south to Atchafalaya Bay and the Gulf of Mexico. The Red River drains an area of some 93,000 square miles (241,000 square km) and has a length of 1,290 miles (2,080 km). The banks of the Red River are highly erosive causing frequent changes to the river channel characteristics as bank caving and sediment deposits occur from each flow event.

The main stem of the Red River flows through two USACE Districts, Tulsa District (SWT) in Southwestern Division (SWD) and Vicksburg District (MVK) in Mississippi Valley Division (MVD). Two other SWD Districts regulate reservoir outflows on tributaries which empty into the Red River. These are Little Rock (SWL) and Fort Worth (SWF) Districts.

The Fort Worth District operates three multi-purpose reservoirs on two tributaries of the Red River. Cooper and Wright Patman Dams are located on Sulphur River with Cooper being the most upstream dam. Farrell’s Bridge Dam, which impounds Lake O’ the Pines, is located on the Cypress River. Both rivers flow into the Red River between Fulton, AR and Shreveport, LA. Some of the authorized purposes
for these projects include flood control, water supply, recreation and environmental releases.

Cooper Dam located on the South Sulphur River at river mile 23.2, upstream of Wright Patman Dam. The lake lies within Delta and Hopkins Counties, about 4 miles south of Cooper, Texas and 15 miles north of Sulphur Springs, Texas. The total drainage area above Cooper Dam is 476 square miles. That area has two principle drainage systems: the Middle Sulphur River and the South Sulphur River. These two rivers have a combined drainage area of 341 square miles above their confluence, with 135 square miles between their confluence and the dam site.

ABSTRACT:

See USACE CWMS - Red River Watershed (SWF) Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed (SWF) Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed (SWF) Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed (SWF) Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed (SWF) Collection Resource

ABSTRACT:

See USACE CWMS - Red River Watershed (SWF) Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Salt River’s drainage area is dominated by steep shallow valleys that are subject to flash flooding. The upper drainage area is mostly rural with several small towns. Downstream of Taylorsville reservoir the basin takes on a more urban character draining parts of the Louisville metro area.

ABSTRACT:

See USACE CWMS - Salt River Watershed (LRL) Collection Resource

ABSTRACT:

See USACE CWMS - Salt River Watershed (LRL) Collection Resource

ABSTRACT:

See USACE CWMS - Salt River Watershed (LRL) Collection Resource

ABSTRACT:

See USACE CWMS - Salt River Watershed (LRL) Collection Resource

ABSTRACT:

See USACE CWMS - Salt River Watershed (LRL) Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

Within the Rogue River watershed, Lost Creek and Applegate Lakes are operated by the USACE’s Portland District. The primary purposes of the Lost Creek Project are flood control, fisheries enhancement, irrigation and municipal and industrial water supply. In addition to these purposes, there are secondary objectives of providing hydropower production, wildlife enhancement, recreation, and water quality control. Lost Creek Lake provides drainage control for 28% of the Rogue River Basin above Grant Pass. The primary purposes of Applegate Lake are flood control, fisheries enhancement, and irrigation. Secondary purposes are recreation, wildlife enhancement and water quality control. However, storage is not allocated specifically for these secondary purposes. A third project, Emigrant Lake, is operated by the US Bureau of Reclamation for flood control. Portland District oversees flood control operations at Emigrant Lake under Section 7 of the Flood Control Act of 1944. Four diversion dams upstream of Lost Creek Lake divert water from Rogue River for power production. Murphy Dam and Mckee Dam downstream of Applegate Lake on Applegate River divert water from Applegate River for irrigation use (for more information see the Lost Creek Lake, Applegate Lake, and Emigrant Lake Water Control Manuals).

Within the Rogue River watershed, there are four geologic provinces: the High Cascades, Western Cascades, Klamath Mountains, and Coast Range. The headwaters of the Rogue River Basin reside primarily within the High Cascades and Western Cascades provinces. The High Cascades geologic province is characterized by highly permeable Pliocene and Quaternary lava flows that typically generate low rates of surface water runoff. The Western Cascades geologic province is characterized by Tertiary volcanic and volcanoclastic rocks that are generally weathered and highly dissected and, thus, generate relatively high rates of runoff. Most of the Rogue River watershed, including its largest tributaries, the Illinois and Applegate Rivers, reside within the Klamath Mountains geologic province. This province is underlain by an amalgamation of Paleozoic and Mesozoic terranes. A small section of the watershed near the confluence of Illinois River and Rogue River is within the Coast Range geologic province. This province consists of Eocene-age marine sedimentary rocks deposited on top of the thrust-faulted metamorphosed rocks of the Klamath Mountains geologic province (USGS, 2016).

ABSTRACT:

See USACE CWMS - Rogue River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Rogue River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Rogue River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - White River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - White River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - White River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - White River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - White River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Pearl River watershed originates at the confluence of the Nanawaya and Tallahaga Creeks in Neshoba County, Mississippi. Flowing southwest across Mississippi and Louisiana to a point near the Gulf of Mexico, where it enters the Rigolets via the West Pearl River and Lake Borgne via the East Pearl River. The Pearl River drains an area of some 8,760 square miles (22,700 square km) and has a length of 444 miles (715 km). The banks of the Pearl River are erosive causing active meandering of the river channel as bank caving and sediment deposits occur from each flow event.

The main stem of the Pearl River flows through one USACE Districts, Vicksburg District (MVK) in the Mississippi Valley Division (MVD). The Vicksburg District operates no reservoirs in the Pearl River watershed. There is one reservoir in the Pearl River Basin managed by the Pearl River Valley Water Supply District. The reservoir impounds 52 square miles in Rankin and Madison Counties, Mississippi and is used for water supply and recreation. Flood control is not an authorized purpose for this Project.

The Corps of Engineers owns three locks along the lower Pearl River Navigation Channel. This project was authorized by congress in 1939 and included the channelization of the West Pearl River, construction of 2 low head sills, a spillway, a 20 mile parallel canal and 3 navigation locks. The project was completed in 1957. . These include Pearl River Lock 1 and spillway (LA 00089) at River Mile 28.5, Bogue Chitto Sill and Pearl River Lock 2 (LA 00088) near River Mile 44, and Pools Bluff Sill and Pearl River Lock 3 (LA 00086) near River Mile 48.7

The Pearl River locks were placed in caretaker status in 1990 due to lack of use. In 2003 the project exceeded its 50 year project life and was considered for de-authorization. However, funding to initiate necessary studies was never approved.

ABSTRACT:

See USACE CWMS - Pearl River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Pearl River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Pearl River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Pearl River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Pearl River Watershed Collection Resource

ABSTRACT:

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Delaware River is the longest un-dammed river east of the Mississippi River, extending 330 miles from the Catskill Mountains in New York to the mouth of the Delaware Bay where it flows into the Atlantic Ocean. The river is fed by 216 substantial tributaries, the largest of which are the Schuylkill and Lehigh Rivers in Pennsylvania. The watershed drains four-tenths of one percent of the total continental U.S. land area. In all, the basin contains 13,539 square miles draining the four states of New York, Pennsylvania, New Jersey, and Delaware.

Parts of five physiographic provinces lie within the Delaware River Basin. These are the Coastal Plain, Piedmont, New England, Valley and Ridge, and Appalachian Plateaus. Topography varies from the relatively flat Coastal Plain, which consists of unconsolidated sediments, to rolling lowlands and a series of broad uplands in the Piedmont. North of the Piedmont Province, the New England and the Valley and Ridge Provinces consist of rock layers that have been deformed into a series of steep ridges and parallel folds that trend northeast-southwest. The Appalachian Plateaus occupy the upper one-third of the basin and are characterized by rugged hills with intricately dissected plateaus and broad ridges. Altitude in the basin increases from sea level in the south to more than 4,000 feet in the north. During the last major glacial advance, the Appalachian Plateaus and parts of the Valley and Ridge and the New England Provinces were glaciated. North of the line of glaciation, valleys typically are underlain by thick layers of stratified drift and till.

Average annual precipitation ranges from 42 inches in southern New Jersey to about 50 inches in the Catskill Mountains of southern New York; annual snowfall ranges from 13 inches in southern New Jersey to about 80 inches in the Catskill Mountains. Generally, precipitation is evenly distributed throughout the year. Annual average temperatures range from 56 degrees Fahrenheit in Southern New Jersey to 45 degrees Fahrenheit in Southern New York.

Approximately five percent of the nation’s population (15 million people) relies on the waters of the Delaware River Basin for drinking and industrial use. The Catskill Mountain Region in the upper basin provides New York City (NYC) with a high quality source of water from three basin reservoirs, Cannonsville, Pepacton, and Neversink. Nearly half of its municipal water supply comes from these reservoirs that is diverted from the Delaware River Watershed. Within the basin, the river supplies drinking water to much of the Philadelphia metropolitan area and major portions of New Jersey, both within and outside of the basin.

From the Delaware River’s headwater in New York to the Delaware Estuary and Bay, the river also serves as an ecological and recreational resource. Over the past half century, as a result of the maintenance of minimum flow targets at Montague and Trenton, NJ, cold-water fisheries have been established in the East Branch Delaware, West Branch Delaware, Nerversink River and the upper main-stem Delaware River. Most of the main-stem upstream of Trenton, NJ has been designated by Congress as part of the Federal Wild and Scenic River System.

There are numerous economic benefits from the river. The Delaware River Port Complex (including docking facilities in Pennsylvania, New Jersey, and Delaware) is the largest freshwater port in the world. According to testimony submitted to a U.S. House of Representatives subcommittee in 2005, the port complex generates $19 billion in annual economic activity. It is one of only 14 strategic ports in the nation transporting military supplies and equipment by vessel to support troops overseas. The Delaware River and Bay is home to the third largest petrochemical port, as well as five of the largest east coast refineries. Nearly 42 million gallons of crude oil are moved on the Delaware River on a daily basis. There are approximately 3,000 deep draft vessel arrivals each year and it is the largest receiving port in the United States for Very Large Crude Carriers (tank ships greater than 125,000 deadweight tons). It is the largest North American port for steel, paper, and meat imports as well as the largest importer of cocoa beans and fruit on the east coast.

ABSTRACT:

See USACE CWMS - Delaware River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Delaware River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Delaware River Watershed Collection Resource

ABSTRACT:

See USACE CWMS - Delaware River Watershed Collection Resource