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I I I I I I I I I I I I I I I I I I I the Amity. Temperature and precipitation data for Lamar and Holly (1950-94, NOAA) and water supply records (1990, Boyle and 1986-94, Amity) were used. Canal and lateral losses were 27 percent and 9 percent, respectively, and minimum on-farm deep percolation and tail water losses were 20 percent and 5 percent, respectively, of the farm delivery. As shown in Table 12 the historical consumptive use averaged 43,865 acre-feet annually and ranged from 8,824 acre- feet in 1964 to 68,749 acre-feet in 1971. Following is a summary of the historical consumptive use per share and per irrigated acre: 1950-94 Average Maximum Minimum Acre-feet oer share 1.27 1.98 0.25 Acre-feet oer acre 1.13 1.76 0.23 1980-94 Average Maximum Minimum 1.50 1.86 1.08 1.33 1.65 0.96 Use as Replacement Supplies. Two shareholders have stated they are interested in selling their shares to LAWMA. To use this water, LAWMA would establish headgates on the Amity Canal at or near the headgates used by these shareholders. LAWMA's pro rata interest would be delivered from LAWMA's headgates through naturally flowing streams to the Arkansas River. The historical consumptive use portion of such deliveries would be credited to LAWMA's replacement obligation. Previously Described Replacement Supplies In addition to its Highland Canal and Fort Bent Ditch interests described earlier, LAWMA has several sources of replacement water. These sources were described in detail in the earlier feasibility report (Helton, 1995). Following is a brief description of each source. Frvinapan-Arkansas Proiect The Southeastern Colorado Water Conservancy District (SECWCD) sells water from the Fryingpan-Arkansas Project for irrigation and municipal purposes. It also sells the irrigation return flows from this water to the well associations. SECWCD includes land under the Fort Lyon Canal and Keesee Ditch. LAWMA will purchase about 2,000 to 3,000 acre-feet annually of return flows to replace depletions caused by its members' irrigation wells within the SECWCD. Page 11