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<br />. <br /> <br />I' ') <br />nDn7'O~) <br /> <br />. <br /> <br />PiDneer, and McClure-Murray ditches as summarized in Appendix B. <br /> <br />. <br /> <br />Irrigation Depletion in the Salt Creek Basin <br /> <br /> <br />Water used for itTigation in the Salt Creek basin is derived primarily <br /> <br /> <br />from diversiDns frDm the LDS Pinos River. Diversions and return flDWS in the <br /> <br /> <br />Salt Creek basin DCCur upstream Df the Salt Creek gaging statiDn. Because <br /> <br />of the relatively large vDlume Df impDrted water, in comparisDn with the esti- <br /> <br /> <br />mated native flow, the histDric Salt Creek gage records bear little relationship <br /> <br /> <br />to the virgin flDW of Salt Creek. ND calculatiDns were made to estimate CDnsump- <br /> <br /> <br />tive use Df water in the Salt Creek basin. Instead, histDric flows were cDnsidered <br /> <br /> <br />tD be equal to the extended gage recDrds, as summarized in Part V of this repDrt. <br /> <br /> <br />The virgin flDW of Salt Creek was estimated Dn the basis of runDff calculatiDns <br /> <br /> <br />as described in Part Vll. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Irrigation Depletion in Segment 1 other than in the Salt Creek Basin <br /> <br /> <br />Segment 1 includes areas alDng the FlDrida River downstream Df Salt <br /> <br /> <br />Creek. An adequate water supply has histDrically been available fDr itTigatiDn <br /> <br /> <br />of the 149 acres of irrigated areas in Reach 1, with water primarily cDntributed <br /> <br /> <br />frDm return flDWS from upstream itTigatiDn diversions. Since irrigated areas <br /> <br /> <br />in Reach 1 are lDcated near the stream channel, monthly stream depletion was <br /> <br /> <br />estimated to be approximately equal tD the mDnthly potential cDnsumptive <br /> <br /> <br />use Df itTigation water. <br /> <br />. <br /> <br />. <br /> <br />Reservoir Evaporation <br /> <br /> <br />Net reservDir evapDratiDn from LemDn Reservoir is equivalent tD the <br /> <br /> <br />tDtal evapDratiDn from the water surface less the evapDtranspiratiDn that wDuld <br /> <br />have occurred by natural vegetation at the site in the absense of reservDir devel- <br /> <br /> <br />Dpment. Vallecito ReservDir temperature and precipitatiDn data were used <br /> <br />in esti,mating Lemon Reservoir evapDratiDn. The average annual net evaporation <br /> <br /> <br />rate was calculated tD be 1.8 acre-feet per acre. <br /> <br />. <br /> <br />. <br /> <br />The water surface area was estimated through use Df historic monthly <br /> <br /> <br />stDrage records and the area-capacity curve fDr LemDn ReservDir. Summaries <br /> <br />-14- <br /> <br />. <br /> <br />;E.,;_:..' <br />