OCR Text |
Show PART IV FUTURE DEMAND Table 26 - Loss of irrigated cropland acreage (1965-2020) _____________ (Unit--1,000 acres)_______________ Inter- state highway Reser- voir. Aban- Hydrologic Subregion Urbanization rights-of-way inundation don-ment Recreation Total Green River Upper Main Stem San Juan-Colorado 11.5 15-5 15.2 2-5 3-4 6.0 13.2 8.5 9.2 1.8 29.9 32.5 24.4 Total 42.2 2.5 30.9 1.8 86.8 Thus to satisfy OBERS requirements for irrigation in the region, a total of 587*^00 acres of potentially irrigable land, including approxi- mately 492,000 acres of existing range and forest land and 95*000 acres presently dry farmed, will need to be developed by 2020. In addition, 421,100 acres of short-supply irrigated lands will need to be provided supplemental water. These acreages are shown by time frames, subregions, and States in Table 27. Table 27 - Projected new irrigation development and presently irrigated land to receive supplemental water (Unit--1,000 acres) Hydrologic Potentially ir/rigable Subregions land±/ Presently irrigated land and States 1980 2000 2020 Total 1980 2000 2020 Total Green River Colorado 15.7 5.3 6.2 27.2 5.9 7.2 6.0 19.1 Utah 8.2 1.0 23.2 32.4 102.6 102.6 Wyoming 3^-9 42.3 14.0 91.2 59.0 26.0 10.0 95.0 Subtotal 58.8 48.6 43.4 150.8 167.5 33.2 16.0 216.7 Upper Main Stem Colorado 60.4 64.1 53.8 178.3 59-2 4o.i 27.2 126.5 Utah 1.0 1.0 2.0 2.0 Subtotal 60.4 64.1 54.8 179.3 59.2 40.1 29.2 128.5 San Juan-Colorado Arizona Colorado 30.0 40.6 15.0 85.6 48.8 5.0 2.0 55.8 New Mexico 53.3 37.9 37.0 128.2 5.5 5.5 Utah 18.7 24.8 53.5 7.0 7.6 14.0 Subtotal 83-3 97.2 76.8 257.3 5^.3 12.0 9.6 75.9 Total 202.5 209.9 175.0 587.4 281.0 85.3 54.8 421.1 1/ Includes 500,600-acre total increase required by OBERS plus an additional 86,800 acres of new land needed to replace presently irri- gated land abandoned or converted to other uses. OBERS projections of total irrigated acreage requirements by 2020 in the region approximate the 1965 level of development plus acreage included |