| OCR Text |
Show PART V ALTERNATE LEVELS OF DEVELOPMENT Departures from the basic data contained in the regionally inter- preted OBERS plan with regard to irrigation are shown in Table 51 and described below. Table 51 - Departure from regionally interpreted OBERS plan due to States' adjustment in irrigation use (6.5 million-acre-foot level of development in year 2020) ___________________(Unit-1,000 acres and acre-feet)________________ _________________Bydrologic Subregions________________ Upper Main San Juan- Green River Stem Colorado Total Acre- Acre- Acre- Acre- States_____Acres feet_____Acres feet Acres feet Acres feet Arizona Colorado +58.3 +111.6 -39.O -66.7 -12.8 -13.4 +6.5 +31-5 New Mexico Utah +9.0 -k.h +1.7 +.2 -21.2 -23.6 -10.5 -27-8 Wyoming _____2^-.9______________________________ 1/-.Q Total +67.3 +106.3 -37.3 -66.5 -34.0 -37.0 -h.O +2.5 1/ Supplemental water supply reduced. Arizona retained its exact allotment of 50,000 acre-feet per annum; hence, there was no change in use for irrigation. Wyoming revised its irrigation depletions downward 900 acre-feet per" annum to stay exactly within its 1^-percent allotment. This involves no change in irrigated acreage but reduces supplemental water development. Utah revised downward its irrigation acreage (-10,500 acres) to stay within its 23-percent allotment under the compact. Colorado varies from regionally interpreted OBERS as follows for irrigated land acreage and water depletions for the years I98O, 2000, ancl 2020, respectively: 18,000 less acres, depleting 88,000 acre-feet less water; 80,000 more acres, depleting 1^5,000 acre-feet more water; and 6,500 more acres of land, depleting 31,500 acre-feet more water. As a result, it appears that Colorado will deplete its 51-75-percent allotment by the year 2000. In addition, 22,100 acre-feet of irrigation water will- be transferred between the years 2001 and 2020 to meet municipal and in- dustrial requirements. In order to stay within its 11.25 percent of the 6.5-million-acre- foot level of development in 2020, it was necessary to reduce New Mexico's depletion by a net of 9>5OO acre-feet annually. There will be no change j, however, in irrigated acreage or acre-feet of water. 93 |
