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<br />3022 <br /> <br />3.5 Historical Diversions and Water Supply <br /> <br />Boyle Engineering with the assistance of Duane Helton compiled the historical diversions and water <br />supply yield for the FI. Lyon Canal Company as a part of the Kansas vs. Colorado litigation. Their <br />summaries which were developed for the Arkansas Basin utilized four stream reaches. The FI. Lyon <br />Canal and its irrigated land lie within Reach 3 (Pueblo Dam to John Martin Dam) and Reach 4 <br />(John Martin Dam to the Colorado-Kansas stateline) of the Boyle study area. The data are <br />summarized for the entire Ft. Lyon system. As described previously FI. Lyon Canal Company <br />receives water from the Arkansas River, Horse Creek Reservoir, Adobe Creek Reservoir and Queen <br />Reservoir. The average annual yield of these diversions for the years 1950-1985 from the Boyle <br />study are presented in Table 3.5. <br /> <br />Table 3.5 Fort Lyon Canal Company Historical Diversions <br /> Average Annual Diversions <br /> Acre-Feet <br />Source 1950-1985 <br />Arkansas River direct flow rights 190,991 <br />Horse Creek Reservoir I 7,573 <br />Adobe Creek Reservoir I 11,443 <br />Queen Reservoir I 1,590 <br />TOTAL ALL SOURCES 211,597 <br /> <br />I Delivety to Fort Lyon Canal <br /> <br />Monthly tabulations of the water supply for the Ft. Lyon Company system from the Arkansas River, <br />Horse Creek Reservoir, Adobe Creek Reservoir, and Queen Reservoir are presented in Table A3.3 <br />of Appendix 3. Fryingpan-Arkansas project water allocation as well as any minor sources of supply <br />such as annual leases are included in the direct flow water right tabulation. An annual summary of <br />water supplies available by source is shown in Table 3.6. The average system yield in Table 3.4 is <br />211,597 acre-feet and the total surface supply ranges from 94,145 to 383,056 acre feet annually over <br />the 1950 to 1985 period. <br /> <br />For the purpose of determining yield, data in the surface column of Table 3.6 is analyzed in an <br />empirical distribution with 36 data points. The result is presented in Figure 3.2. The probability, <br />also termed reliability, of divertable yield is determined. For example, the ninety percent (P = 1.0 - <br />.90 = 0.1) reliable annual flow is about 110,000 af per year; Le., a minimum flow of 110,000 af <br />annually should be available 90 percent of the time. <br /> <br />3-8 <br />