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Revised Surface Water Supply Index (SWSI) for Colorado

Revised Surface Water Supply Index (SWSI) for Colorado. NIDIS Upper Colorado River Basin Meeting Feb. 24, 2011 Mike Gillespie, NRCS. Original Colorado SWSI: 1982 – present Dec – May: Snowpack, Reservoir Storage & Total WY Precipitation

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Revised Surface Water Supply Index (SWSI) for Colorado

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  1. Revised Surface Water Supply Index (SWSI) for Colorado NIDIS Upper Colorado River Basin Meeting Feb. 24, 2011 Mike Gillespie, NRCS

  2. Original Colorado SWSI: 1982 – present • Dec – May: Snowpack, Reservoir Storage & Total WY Precipitation • June – November: Monthly Streamflow, Reservoir Storage, Monthly Precipitation • Weighted sum of nonexeedance probabilities - does not statistically behave like a nonexeedance probability itself, nor does it allow for comparison of basins on an equal probability basis.

  3. Revised SWSI: Developed by David Garen 1993 • Definition: Surface-water supply – The quantity the SWSI is intended to index, is to be the reservoir storage at the beginning of, plus the natural streamflow during, the primary snowmelt and growing season relevant to the region of interest. • Transition from 4 digit to 8 digit HUCs • An increase from 7 SWSI values to ~42 SWSI values per month • Methodology: • For Jan-Jun: SWSI = Streamflow Forecast + Reservoir Storage • For Jul-Sept: SWSI = Reservoir Storage + Obs. Streamflow • For Oct-Dec: SWSI = Reservoir Storage

  4. Schedule: • Colorado Basin (west of Cont. Divide) complete April 15, 2010. • Rio Grande, Arkansas and South Platte completed by April 15, 2011 • Reconstructed historical time series (1982 – Present) and comparison to observed annual water supplies and traditional SWSI values. Provided by Doesken and Wolter, summer 2011.

  5. Existing SWSI Format

  6. 14050003 10190007 14050002 10180001 14050001 10190006 10190012 14010001 14050005 10190005 10190003 10190004 14010003 14010002 14010005 10190002 14010004 10190001 14020005 14020004 14020001 11020001 11020008 14020006 14020003 14030003 14020002 11020002 11020009 13010004 11020005 14030002 13010001 14080104 11020006 14080202 14080107 13010002 14080101 11020010 14080105 13010005 14080102

  7. Colorado SWSI October 2010

  8. Colorado SWSI November 2010

  9. Colorado SWSI December 2010

  10. Colorado SWSI January 2011

  11. Colorado SWSI February 2011

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