Comparison between MODIS and Landsat-based annual ET in relation to a base map using the Operational Simplified Surface Energy Balance (SSEBop) model.
The WaterSMART (Water for Sustainable Management of America’s Resources for Tomorrow) project of the U.S. Department of the Interior (DOI) / U.S. Geological Survey (USGS) aims to quantify the year-to-year variability of vegetation water use (consumptive use), with a focus on irrigated lands, in a cost-effective and timely manner, i.e., previous year consumptive use estimates need to be available before the next irrigation season starts. We improve upon existing hydrologic models to estimate and validate evapotranspiration (ET) from irrigated lands and the general landscape using a combination of satellite data and weather datasets.
The USGS EROS approach to ET estimation will allow the quantification of ET at two important scales: (1) field and (2) hydrologic basin. Field-scale ET will be used for water use estimation to understand and quantify where, by whom, and how much water is being used in the landscape. On the other hand, basin-scale ET will assist in understanding basin water balance and water availability. Quantifying water use and water availability is a critical component of the WaterSMART objectives. Irrigation water use information is used for the planning and implementation of water resources allocation and curtailment guidelines. Similarly, ET information is critical in understanding groundwater withdrawal and recharge rates, as well as for drought monitoring. The primary users of this product are State water engineers and hydrologists, and USGS water scientists.
Principal Investigator: Gabriel Senay, email@example.com, and Jim Verdin, verdin@usgs, EROS Center, Sioux Falls, SD
Project Team: Jim Rowland, Stefanie Bohms, Ramesh Singh, and Manohar Velpuri