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1111111:1!, s ourees for Net Irrination Requirements and Harvested Irriaated Acreaoe T.hl_ 1 T.hl_ , Table 2 Table 3 NRCS Net Irrigation Harvested Irrigated Harvested Irrigated Acreage Crops with calculated Net Data Acreage from the from the 1992 Ag Census Irrigation Requirements CASS 1996 Alfalfa Alfalfa Hay Alfalfa Hay_ Corn (grain) Corn (grain) Corn (grain) Pasture GrasslTurf Sod Turf Potatoes Potatoes Potatoes Sorghum (grain) Sorghum (grain) Sorghum (grain) Dry Beans Dry Beans Dry Beans Sugar Beats Sugar Beels Sugar Beats Avg of Orchards w/o Orchards Orchards cover_and wI Cover - Sunflowers Sunflowers Sunflowers Melons/Canta/oups Combined Melons and Melons/Cantaloups Cantaloups Corn {sweet} Sweet Corn Sweet Corn T amatoes Tomatoes Tomatoes Small_V_egetables Dry Onions Dry Onions SmalLVegetables Lettuce Lettuce Small Vegetables Spinach Spinach Sum of small vegetables less Small Vegetables dry onions, sweat corn, Small Vegetables lettuce. spinach, and snap beans Snap Beans Snap Beans Snap Beans Corn (silage) Corn (silage) Corn (silage) Soybeans Soybeans Soybeans I/VinterVv'heat (fall) WmterVv'heat Winter Vv'heat I/Vinter Vv'heate (spring) Spring Vv'heat Spring VVheat Spring Grain Oats Oals Spring Grain Barley Barley - Pasture GrasslTurf Pastureland and Other Land Pasture and Other Land Pasture GrassfTurf Other Hav Other Hav Other Hav Future Refinements and Considerations I. Use this method to estimate irrigation r~quirements tor )Q85 and I QQO and compare the results with published USGS consumptive use estimates for the same) ears. 2. Use this method to estimate irrigation requirements for each basin and sub. basin in Colorado, ], Investigate the relationship oct\\eell estimates of net irrigation requirements and consumptive use. 4. Use this method \\ith dl}"-instead of nonnal-) ear precipitation data to eSlimate irrigation requirements under drought conditions. As defined by Ihe NRCS a dry year is a )'ear in which the growing: season efTectiw precipitation will be equaled or exceeded 8 out 10 years. 5. Refine this method by including. non.hancsted as "ell as han-esled irrigated cropland. Non.han'ested irrigated acreage ma) occur because of hail damage. for example. 6. Combine net irrigation requirement data "ith economic data to estimate gross sales and profitability in dollars per acre. foot for all crops. Use linear programming techniques to generale scenarios for maintaining current levels of agricuhural sales and protitabilil) \\ith reduced levels of \\'ater for agricultural use.