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BCCZO -- Well Water Levels -- GGU_Slug_Test -- Gordon Gulch Upper -- (2016-2016)


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Created: Nov 19, 2019 at 7:34 a.m.
Last updated: Dec 24, 2019 at 12:19 a.m.
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Abstract

A series of slug tests were performed at groundwater monitoring wells in upper Gordon Gulch. The spefic wells tested were GGU_GW1, GGU_GW2, GGU_GW3, GGU_GW4, GGU_GW5, and GGU_GW6. Slug tests were perfomed by Steven Henning, a master's candidate at CU Boulder. Tests were performed on 8/6-7/2015 and 9/12-13/015. The tests were perfomed to determine the hydraulic conductivity of the aquifer material around the monitoring wells.

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Gordon Gulch, Gordon Gulch Upper
North Latitude
40.0210°
East Longitude
-105.4766°
South Latitude
40.0188°
West Longitude
-105.4768°

Temporal

Start Date:
End Date:

Content

ReadMe.md

BCCZO -- Well Water Levels -- GGU_Slug_Test -- Gordon Gulch Upper -- (2016)


OVERVIEW

Description/Abstract

A series of slug tests were performed at groundwater monitoring wells in upper Gordon Gulch. The spefic wells tested were GGU_GW1, GGU_GW2, GGU_GW3, GGU_GW4, GGU_GW5, and GGU_GW6. Slug tests were perfomed by Steven Henning, a master's candidate at CU Boulder. Tests were performed on 8/6-7/2015 and 9/12-13/015. The tests were perfomed to determine the hydraulic conductivity of the aquifer material around the monitoring wells.

Creator/Author

Steven Henning

CZOs

Boulder

Contact

Steven Henning (steven.henning@colorado.edu)

Subtitle

GGU_GW_1, GGU_GW_2, GGU_GW_6




SUBJECTS

Disciplines

Hydrology

Topics

Well Water Levels

Subtopic

GGU_Slug_Test

Keywords

None

Variables

None

Variables ODM2

Groundwater Depth




TEMPORAL

Date Start

2016-01-01

Date End

2016-01-02




SPATIAL

Field Areas

Gordon Gulch

Location

Gordon Gulch Upper

North latitude

40.020990999999995

South latitude

40.018815999999994

West longitude

-105.476828

East longitude

-105.476603




REFERENCE

CZO ID

6541




COMMENTS

Comments

Slug testes were performed fl]ollowing ASTM D4041 and ASTM D4044 standards. Materials used include 3 weighted slugs of various volumes, electric tape, an In-Situ Level Troll 700 pressure transducer, and An In-Situ RuggerReader field computer.

To initate a falling head slug test, depth to water in each well was first checked with an electric tape. Then the pressure transducer was lowered into the well to a depth below the estimated elevation of the bottom of the slug that was to be dropped. Then the depth to water was remeasured witht the electric tape and entered into the RuggedReader to calibrate the depth to water with the transducer. After calibrating the pressure transducer, active logging of the depth to water was started to get a steady baseline recorded. After approximately 30 seconds of background recording, the slug was rapidly lowered intothe well to create an instantaneous rise in water level and head within the well. Initial displacement was noted and the water level was allowed to begin recovering. After the change in head had be reduced to 10% of the inital change, the test and water level recoding was stopped. This process is repeated for a rising head test, with the exception of the slug being rapidly withdrawn from the well rather than being lowered into it. In some cases the testing of the well was stopped before the water level recoved to within 10% of its starting value to to time constraints or inclement weather.

The data gathered from the pressure transducers has not been edited, but at least 2 of the 26 tests performed (Well4, Falling Test 2; Well6, Rising Test 3) show instrument error that should be accounted for in some way before using the data.

Additional Metadata

Name Value
czos Boulder
czo_id 6541
comments Slug testes were performed fl]ollowing ASTM D4041 and ASTM D4044 standards. Materials used include 3 weighted slugs of various volumes, electric tape, an In-Situ Level Troll 700 pressure transducer, and An In-Situ RuggerReader field computer. To initate a falling head slug test, depth to water in each well was first checked with an electric tape. Then the pressure transducer was lowered into the well to a depth below the estimated elevation of the bottom of the slug that was to be dropped. Then the depth to water was remeasured witht the electric tape and entered into the RuggedReader to calibrate the depth to water with the transducer. After calibrating the pressure transducer, active logging of the depth to water was started to get a steady baseline recorded. After approximately 30 seconds of background recording, the slug was rapidly lowered intothe well to create an instantaneous rise in water level and head within the well. Initial displacement was noted and the water level was allowed to begin recovering. After the change in head had be reduced to 10% of the inital change, the test and water level recoding was stopped. This process is repeated for a rising head test, with the exception of the slug being rapidly withdrawn from the well rather than being lowered into it. In some cases the testing of the well was stopped before the water level recoved to within 10% of its starting value to to time constraints or inclement weather. The data gathered from the pressure transducers has not been edited, but at least 2 of the 26 tests performed (Well4, Falling Test 2; Well6, Rising Test 3) show instrument error that should be accounted for in some way before using the data.
subtitle GGU_GW_1, GGU_GW_2, GGU_GW_6
variables
disciplines Hydrology

How to Cite

Henning, S. (2019). BCCZO -- Well Water Levels -- GGU_Slug_Test -- Gordon Gulch Upper -- (2016-2016), HydroShare, http://www.hydroshare.org/resource/5b9a322c650a44b68666c3e7a45fbdf9

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
CC-BY

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