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DRAFT Preliminary Water Demand Forecasts
<br />• Tabl.e 2 indicates that Projected M&I demands for 2030 are projected to increase in
<br />each of the eight major river basins in Colorado. The Colorado and Dolores/San
<br />Juan/Miguel Basins are projected to have the greatest increase, while the North Platte
<br />and Rio Grande will have the least. Total M&I and self-supplied water demand is
<br />projected to increase by over 700,000 acre-feet (AF) per year by the year 2030, with
<br />ovei• 575,000 AF of this demand in the South Platte and Arkansas Basins.
<br />Table 2 Prelimina S tatewide M&I Dem and Pro'ections*
<br /> Estimated • . - -. Increase
<br /> 000 Self- 2030 Self- . .
<br />Self-
<br /> Estimated .. -. • . - - d .. -. pp -.
<br /> 2000 M&I . 030 M&I . Industrial
<br />
<br />i D- . .
<br />, D- . .
<br />, D- . .
<br />, D- d
<br />, D- . d
<br />,
<br />Bas
<br />n
<br />Arkansas 203,000 58,000 311,000 58,000 108,000
<br />Colorado 72,000 57,000 143,000 62,000 75,000
<br />Dolores/San Juan/ 26,000 11,000 48,000 11,000 22,000
<br />San Mi uel
<br />Gunnison 22,000 430 40,000 670 18,000
<br />North Platte 440 - 550 - 110
<br />Rio Grande 17,000 - 23,000 - 5,700
<br />South Platte 691,000 92,000 1,150,000 103,000 469,000
<br />Yam a/White/Green 15,000 14,000 24,000 14,000 9,800
<br />Total 1,050,000 233,000 1,740,000 250,000 708,000
<br />• `Water demands are gross tliversions and not consumptive use.
<br />Source: SWSI Preliminary Demand Forecast
<br />Agricultural Demands
<br />Water demands for agricultural purposes were determined for current conditions
<br />using estimates of crop irrigation water requirements (irrigated acreage, cropping
<br />patterns, and climatic data), historic water application amounts (surface diversions
<br />and groundwater pumping), and crop consumptive use.
<br />Existing data sets and models from the CDSS are available for the Colorado,
<br />Gunnison, Yampa/White/Green, Dolores/San Juan/San Miguel, and Rio Grande
<br />Basins. Crop irrigation water requirements were estimated for these particular basins
<br />using the irrigated acreage and crop types with the climate data and appropriate
<br />water balance models within the StateCU model. Using CDSS tools, the crop
<br />requirements at diversion structures were summed to calculate a total annual
<br />irrigation water requirement by basin or region. Total crop consumptive use on an
<br />annual basis by basin was determined by summing a supply limited crop
<br />consumptive use amount based upon historic diversions and soil moisture carryover
<br />at ea.ch diversion structure.
<br />A different approach is required for the non-CDSS North Platte, South Platte, and
<br />? Arkansas Basins to estimate crop irrigation water requirements. Existing sources and
<br />studies have been used to compile information on irrigated acreage and cropping
<br />??? ?
<br />S:\MEETINGS\CYVCB BOARD\PRELIMINARV DEMAND SUMMARY MEMO TO CWCB 1-20-04 REV.DOC
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