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Home > Technical Resources > Drought Planning Toolbox > DroughtIndices > Revised Surface Water Supply Index (SWSI)  

DroughtIndices: Revised Surface Water Supply Index (SWSI)

Title

Revised Surface Water Supply Index (SWSI) 

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Index Description

The SWSI index was developed by the Office of the State Engineer and the USDA Natural Resources Conservation Service (NRCS). SWSI is an indicator of mountain-based water supply conditions in the major river basins.  SWSI values in January through June is based on reservoir storage and forecasted flow. July through September is based on reservoir storage and actual (native) flow.  October through December is only based on reservoir storage. The resulting scores generally range from +4.16 (abundant water supplies) to -4.16 (extreme drought conditions).

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Created at 11/15/2010 3:33 PM  by System Account 
Last modified at 9/22/2015 11:52 AM  by System Account