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USGS - science for a changing world

Annual Water Availability (Precipitation minus Evapotranspiration)


Original Data Basin Creation Date
2012-09-19 15:56:30
Original Data Basin Modified Date
2012-09-19 17:26:10


Available water is calculated by subtracting evapotranspiration from precipitation. This water can be stored in lakes, soil moisture, and underground aquifers, or else it will flow into a river channel and eventually reach the ocean. Our map was built using precipitation data from WorldClim and evapotranspiration data from the MOD16 Global Evapotranspiration Product. Both datasets have one kilometer resolution, but the latter is not valid over urban or barren land, so available water was not calculated for these areas. In order to highlight the central roll topography plays in directing the flow of water, we used the No Alteration of Grayscale or Intensity (NAGI) method to combine this map with an elevation hillshade.


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  • Data Basin



Data source
University of Montana; WorldClim; Esri Mapping Center
Harvested on Fri May 23 09:36:54 MDT 2014 from Data Basin Service

Additional Information


Type Scheme Key
UniqueKey Data Basin 956eb737faaa4f45ae39d3785f5c8a4e

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