APP: The Rapid Forcing Retrieval (RFR) Web Application Tool
Project Period: June 11 ñ October 3rd, 2022
Developers/Authors: Kenneth Ekpetere | Xingong Li | Jonathan Frame | 
APP Url: https://cartoviews.users.earthengine.app/view/rapid-forcings-retrieval 
Funder: This Project received no grant/funds at the time of development.
Support: The RFR was developed at the 2022 Summer Institute organized by the Consortium of Universities for the Advancement of Hydrological Science Incorporated (OCUAHSI) and NOAAís Office of Water Prediction (OWP).
Key Words: Forcings, Hydrologic, NLDAS, Flow_predictions, Watersheds, Gages, Rapid_Forcing_Retrieval.

Contact: Kenneth.ekpetere@gmail.com | Kennethekpetere@ku.edu 

App Description:
The Rapid Forcings Retrieval (RFR) tool gets the hourly Forcings in a CSV and GeoTIFF formats for small and large-scale areas to drive hydrological models. The CSV is the main output for driving dynamic hydrologic process, while the GeoTIFF is an average of the selected period. The RFR retrieves Forcings for specific United States Geological Survey (USGS) Hydrologic Units watersheds, CAMELS (Catchment Attributes and Meteorology for Large-sample Studies) basins, and points (gauged and ungauged locations). RFR relies on the North American Land Data Assimilation System (NLDAS) hosted on Google Earth Engine. NLDAS Forcings (Precipitation, Evapotranspiration, Temperature, Specific Humidity, Surface Pressure, Convective Fraction, wind, Potential Energy, Long and Shortwave Radiation) are vital model inputs for discharge prediction. Users can quickly select a specific date range and area of interest to subset Forcings which are then served into a model for streamflow predictions. RFR allows users to export specific Forcings at a time, keeping the interface clean while preventing crowding of panel. The RFR intends to support current Forcings source for the NOAA Office of Water Prediction (OWP) and does not act as a replacement for the current source. RFR will be useful to Hydrologists, Environmental Resource Managers, and other scientists using Forcings. Currently, RFR can help support the ongoing Next Generation (NEXTGEN) Framework hydrological models testing and validations. A use case begins with (1) visualizing watersheds scales, (2) digitizing specific watershed boundary, (3) selecting specific date range, (4) choosing forcing variables to output, and (5) exporting forcings as desired by user. Users must note that all output datasets begin from 00:00 UTC at start date and ends at 23:00 UTC at the entered end date. 

Citation: Ekpetere, K. O., X. Li, J. Frame (2022). The Rapid Forcing Retrieval (RFR), HydroShare, http://www.hydroshare.org/resource/adc37a792a6144c9a1d45e05621e4230