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Figure 2 <br />Irrigation Water Requirements and Water Supply-Limited CU <br />1800000 <br />1600000 <br />1400000 <br />1200000 <br />r <br />'~ 1000000 <br />L <br />V <br />:~ 800000 <br />U <br />600000 <br />400000 <br />200000 <br />1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 <br />®WaterSupply-Limited CU OShortage -Irrigation Water Requirement <br />The use of ground water to meet irrigation water requirements has been common practice <br />during the study period. Based on the 1998 well to irrigated parcel associations discussed <br />in Appendix A, approximately 52 percent of the irrigated acreage in the basin has the <br />ability to either meet their entire demand, or help reduce surface water shortages, with <br />ground water. The average annual consumptive use of surface water from 1950 through <br />2002 was approximately 394,475 acre-feet while the average annual consumptive use of <br />ground water was approximately 364,570 acre-feet. Figure 3 demonstrates that the <br />supply from ground water has generally increased from 1950 to 2002 as new wells were <br />developed. Also, the supply from ground water increases when surface water supplies <br />decrease. Note that 1963, 1977, 2000, 2001 and 2002 had high pumping estimates, <br />corresponding to years of reduced surface water availability. In recent years, 1993 and <br />1995 had low pumping estimates, corresponding to wet hydrologic years. <br />cureport_6-2004.doc 4 of 48 June, 2004 <br />