This USGS Data Release represents Soil-Water Balance (SWB) groundwater infiltration modeling results for the Lower Colorado River Basin (LCRB). The data release was produced in compliance with 'open data' requirements as a way to make the scientific data associated with USGS research efforts and publications available to the public. There are 3 separate groups of datasets associated with this Data Release: 1. SWB model results from simulations run using projected climate data, summarized by month from 1950 through 2099, for the LCRB within the United States 2. SWB model results from simulations run using projected climate data, summarized by month from 1950 through 2099, for the Grand Canyon region 3. SWB model results from simulations run using projected climate data, summarized by month from 1950 through 2099, for the alluvial basins of Arizona.

This USGS Data Release represents Soil-Water Balance (SWB) groundwater recharge modeling results for the Upper Colorado River Basin (UCRB). The data release was produced in compliance with 'open data' requirements as a way to make the scientific products associated with USGS research efforts and publications available to the public. There are 4 separate datasets associated with this Data Release: 1. SWB model results from simulations run using observed climate data, summarized by water year from 1951 through 2010 2. SWB model results from simulations run using projected climate data, summarized by month and UCRB sub-basin from 1950 through 2099 3. SWB model results from simulations run using projected climate data, summarized by water year from 1951 through 2099 4. SWB model results from simulations run on climate data from 1981 through 2014 at ~800m, ~4km, and ~12km spatial scales.

This USGS Data Release represents Soil-Water Balance (SWB) groundwater recharge modeling results for the Upper Colorado River Basin (UCRB). The data release was produced in compliance with 'open data' requirements as a way to make the scientific products associated with USGS research efforts and publications available to the public. There are 4 separate datasets associated with this Data Release: 1. SWB model results from simulations run using observed climate data, summarized by water year from 1951 through 2010 2. SWB model results from simulations run using projected climate data, summarized by month and UCRB sub-basin from 1950 through 2099 3. SWB model results from simulations run using projected climate data, summarized by water year from 1951 through 2099 4. SWB model results from simulations run on climate data from 1981 through 2014 at ~800m, ~4km, and ~12km spatial scales.

The Colorado River and its tributaries supply water to more than 35 million people in the United States and 3 million people in Mexico, irrigating more than 4.5 million acres of farmland, and generating about 12 billion kilowatt hours of hydroelectric power annually. Planning for the sustainable management of the Colorado River in future climates requires an understanding of the Upper Colorado River Basin groundwater system. The Upper Colorado River Basin, encompassing more than 110,000 square miles (mi2), contains the headwaters of the Colorado River and is an important source of snowmelt runoff to the River. Groundwater discharge also is an important source of water in the River and its tributaries, with estimates ranging from 21 to 58 percent of streamflow in the upper basin. A study by Castle and others (2014) using remotely sensed gravity observations from the NASA Gravity Recovery and Climate Experiment (GRACE) mission found that UCRB groundwater was depleted by more than 17 million acre-feet (ft) from December 2004 to November 2013. Understanding groundwater-budget components, including groundwater recharge, is important to sustainably manage both groundwater and surface-water supplies in the Colorado River Basin.

The Colorado River and its tributaries supply water to more than 35 million people in the United States and 3 million people in Mexico, irrigating more than 4.5 million acres of farmland, and generating about 12 billion kilowatt hours of hydroelectric power annually. Planning for the sustainable management of the Colorado River in future climates requires an understanding of the Upper Colorado River Basin groundwater system. The Upper Colorado River Basin, encompassing more than 110,000 square miles (mi2), contains the headwaters of the Colorado River and is an important source of snowmelt runoff to the River. Groundwater discharge also is an important source of water in the River and its tributaries, with estimates ranging from 21 to 58 percent of streamflow in the upper basin. A study by Castle and others (2014) using remotely sensed gravity observations from the NASA Gravity Recovery and Climate Experiment (GRACE) mission found that UCRB groundwater was depleted by more than 17 million acre-feet (ft) from December 2004 to November 2013. Understanding groundwater-budget components, including groundwater recharge, is important to sustainably manage both groundwater and surface-water supplies in the Colorado River Basin.

This model archive contains the Soil-Water-Balance (SWB) model used to simulate potential mean annual recharge in the Grand Canyon region for 1981 through 2016. The simulated results are described in the associated U.S. Geological Survey Scientific Investigations Report 2022-xxxx. The model archive includes all the necessary files to document and run the SWB model and process the results as displayed in the accompanying report. The directories in the archive are presented each as a separate .zip file and include an "ancillary" directory, a "bin" directory, a "georef" directory, a "model directory, an "output" directory, and a "source" directory. There is a README file describing all the files and directories in the archive and information on how to run the model.

This model archive makes available the calibrated Soil-Water-Balance (SWB) model used to simulate potential recharge for the State of Maine for 1991 to 2015. The model was calibrated using annual values of runoff, evapotranspiration, and recharge for 32 watersheds in the State. The simulations were used to create 25-year statistical grids of annual potential recharge (mean, median, minimum, and maximum), and the uncertainty around these grids. The calibrated SWB model and its use is described in the associated U.S. Geological Survey Scientific Investigations Report 2019–5125. The Maine SWB model was used to create output at two different scales: 250-meter and 500-meter grid cells. The calibration and uncertainty analysis were carried out at the 500-m grid size, and the final model runs were done at the 250-m grid size. The model archive includes all the files used in the calibration and uncertainty runs, which are described in the accompanying Scientific Investigations Report 2019–5125. The directory structure of the model archive contains all the files needed to document and run the model. The directories in the archive are presented each as a separate .zip file and include an "ancillary" directory, a "bin" directory, a "georef" directory, a "model directory, an "output" directory, and a "source" directory. There is a README file describing all the files and directories in the archive and information on how to run the model. Each primary folder also contains a README file describing the contents.

The Colorado River and its tributaries supply water to more than 35 million people in the United States and 3 million people in Mexico (Bureau of Reclamation, 2011), irrigating more than 4.5 million acres of farmland, and generating about 12 billion kilowatt hours of hydroelectric power annually (Colorado River Basin Salinity Control Forum, 2011). Planning for the sustainable management of the Colorado River in future climates requires an understanding of the Lower Colorado River Basin groundwater system. This data release contains summarized output from Soil-Water Balance groundwater infiltration model simulations for the Lower Colorado River Basin. Model output available in this release includes groundwater infiltration, potential evapotranspiration (PET), actual evapotranspiration (AET), precipitation, and temperature.

The Colorado River and its tributaries supply water to more than 35 million people in the United States and 3 million people in Mexico (Bureau of Reclamation, 2011), irrigating more than 4.5 million acres of farmland, and generating about 12 billion kilowatt hours of hydroelectric power annually (Colorado River Basin Salinity Control Forum, 2011). Planning for the sustainable management of the Colorado River in future climates requires an understanding of the Lower Colorado River Basin groundwater system. This data release contains summarized output from Soil-Water Balance groundwater infiltration model simulations for the Lower Colorado River Basin. Model output available in this release includes groundwater infiltration, potential evapotranspiration (PET), actual evapotranspiration (AET), precipitation, and temperature.

This USGS Data Release represents Soil-Water Balance (SWB) groundwater recharge modeling results for the Upper Colorado River Basin (UCRB). The data release was produced in compliance with 'open data' requirements as a way to make the scientific products associated with USGS research efforts and publications available to the public. This dataset comprises SWB model results from runs using historical climate data over the 1981-2014 time period, for spatial scales of 800m, 4km, and 12km, and for time steps of daily or monthly stress periods. There are 10 separate datafiles associated with this Data Release: 1. SWB model results for the original 4km DAILY PRISM climate data, summarized by month from 1981 through 2014 2. SWB model results for 800m DAILY climate data that were downscaled from the original 4km DAILY PRISM climate data, summarized by month from 1981 through 2014 3. SWB model results for 4km DAILY climate data that were aggregated from the downscaled 800m DAILY climate data, summarized by month from 1981 through 2014 4. SWB model results for 12km DAILY climate data that were aggregated from the original 4km DAILY PRISM climate data, summarized by month from 1981 through 2014 5. SWB model results for 4km DAILY climate data that were downscaled from aggregated 12km DAILY climate data, summarized by month from 1981 through 2014 6. SWB model results for 4km MONTHLY climate data that were summarized from the original 4km DAILY PRISM climate data, summarized by month from 1981 through 2014 7. SWB model results for 800m MONTHLY climate data that were summarized from the 4km_800m DAILY climate data, summarized by month from 1981 through 2014 8. SWB model results for 4km MONTHLY climate data that were summarized from the 800m_4km DAILY climate data, summarized by month from 1981 through 2014 9. SWB model results for 12km MONTHLY climate data that were summarized from the 4km_12km DAILY climate data, summarized by month from 1981 through 2014 10. SWB model results for 4km MONTHLY climate data that were summarized from the 12km_4km DAILY climate data, summarized by month from 1981 through 2014