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Twelve-digit hydrologic unit actual evapotranspiration and snowpack water equivalent storage from the National Hydrologic Model Infrastructure with the Precipitation-Runoff Modeling System 1980-2016

July 24, 2020

This dataset is part of the National Water Census Water Budget Estimation and Evaluation Project's ongoing development of best estimates of daily historical water budgets for over 100,000 hydrologic units across the United States. In this release, estimates of actual evapotranspiration and snowpack water equivalent storage are added to the already released estimates of soil moisture, recharge, streamflow, and precipitation. All these estimates are made available per twelve-digit hydrologic unit code watershed as contained in the NHDPlus v2.1 dataset. As this project progresses, it is expected that a complete closed water budget generated from the same water budget model will succeed this data release. For background on source data and generation of these water budget variables, see nhru_pkwater_equiv.csv and nhru_hru_actet.csv from: Hay, L.E., 2019, Application of the National Hydrologic Model Infrastructure with the Precipitation-Runoff Modeling System (NHM-PRMS), by HRU Calibrated Version: U.S. Geological Survey data release, https://doi.org/10.5066/P9NM8K8W The water budget variables were converted to a HUC12 basis using area-weighted spatial interpolation. All code used for conversions are included as an attachment to this data release. Summary of files included: 1) hu12_ids.csv - twelve digit hydrologic unit (HUC12) code identifiers used in all files 2) timesteps.csv - timesteps used in all files. 3) nhm_eta.nc - NetCDF version of actual evapotranspiration data 4) nhm_eta_grid.csv - One timestep per row version of actual evapotranspiration data 5) nhm_eta_timeseries.csv - One HUC12 per row version of actual evapotranspiration data 6) nhm_snowpack.nc - NetCDF version of snowpack water equivalent data 7) nhm_snowpack_grid.csv - One timestep per row version of snowpack water equivalent data 8) nhm_snowpack_timeseries.csv - One HUC12 per row version of snowpack water equivalent data 9) scripts.zip - A reproducible R workflow to create outputs implemented with the drake package This data release compliments the following related data releases. Soil moisture and recharge: Blodgett, D.L., 2019, Twelve digit hydrologic unit soil moisture and recharge from the National Hydrologic Model Infrastructure with the Precipitation-Runoff Modeling System: U.S. Geological Survey data release, https://doi.org/10.5066/P9ZZAWK4. Streamflow: Russell, A.M., Over, T.M., and Farmer, W.H., 2018, Statistical daily streamflow estimates at HUC12 outlets in the conterminous United States, Water Years 1981-2017: U.S. Geological Survey data release, https://doi.org/10.5066/P9DPSY6G. Precipitation: https://www.sciencebase.gov/catalog/item/52a7bed0e4b0de1a6d2dd0fd

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