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Drought in Oregon

Learn about different types of droughts, indices like PDSI and SWSI, and government committees addressing water availability. Explore drought definitions and monitoring in Oregon.

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Drought in Oregon

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  1. Drought in Oregon George H. Taylor October, 2007

  2. Detroit Lake, 2001

  3. Definitions of Drought An absolute drought is a period of at least 15 consecutive days to none of which is credited 0.01 inches of rain or more. A partial drought is a period of at least 29 consecutive days, the mean daily rainfall of which does not exceed 0.01 inches. A dry spell is a period of at least 15 consecutive days to none of which is credited 0.04 inches or more.

  4. “Absolute drought”

  5. Drought Indices Drought Indices Palmer Drought Severity Index (PDSI) Surface Water Supply Index (SWSI) Keetch-Byram Drought Index (KBDI) Standardized Precipitation Index ("SPI") Percent of Normal Crop Moisture Index Percentiles Deciles …others

  6. Surface Water Supply Index (SWSI) Designed as an indicator of surface water conditions for areas which are "mountain water dependent," in which mountain snowpack is a major component. Inputs: Precipitation Reservoir storage Snowpack Stream flow 4.0 extremely wet 0 normal -4.0 extremely dry

  7. USDA (Sect. of Ag.) Governor Drought Council Water Availability Committee Counties OWRD SC ODF NRCS NWS USGS

  8. Soil Climate Analysis Network (SCAN)

  9. The End

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