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<br />. <br /> <br />flfJ07S1 <br /> <br />. <br /> <br />. <br /> <br />A pDrtion of the precipitatiDn Dccurring during the irrigation seaSDn <br /> <br /> <br />was estimated tD be effective in reducing irrigatiDn requirements, based Dn <br /> <br /> <br />use Df the mDdified Blaney-Criddle procedure fDr calculating effective precipita- <br /> <br /> <br />tiDn. Using these data, the average annual potential cDnsumptive use of irriga- <br /> <br />tiDn water was estimated to be 2.10 acre-feet per acre for the mix of crDps <br /> <br /> <br />irrigated in the FIDrida River basin, prDvided that the irrigation water supply <br /> <br /> <br />is sufficient in time and quantity. Since the irrigated area in the Florida River <br /> <br /> <br />basin is about 22,000 acres, the tDtal pDtentia1 consumptive use requirement <br /> <br /> <br />fDr full irrigatiDn is abDut 46,000 acre-feet. <br /> <br />. <br /> <br />. <br /> <br />Irri2ation Depletion Upstream of Florida Farmers Ditch <br /> <br /> <br />Irrigation diversiDns upstream of the FlDrida Farmers Ditch include diver- <br /> <br /> <br />siDns fDr irrigatiDn Df small areas located near the stream channel and diversiDns <br /> <br />by the FIDrida. Canal for irrigatiDn Dn the Florida Mesa. The analysis Df depletiDns <br /> <br /> <br />assDciated with diversiDns tD the FlDrida Mesa is described in the fDllDwing <br /> <br /> <br />paragraph. GrDundwater and surface water return flDws were estimated tD <br /> <br /> <br />return tD the river within Dne mDnth, resulting in a negligible return flDws lag. <br /> <br /> <br />Thus, stream depletiDn assDciated with irrigatiDn was estimated tD be apprDxi- <br /> <br /> <br />mately equal tD the mDnthly cDnsumptive use values. The water supply fDr <br /> <br /> <br />irrigation upstream Df the FlDrida Farmers Ditch is generally always sufficient <br /> <br /> <br />tD meet the potential crop cDnsumptive use requirement. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Irri2ation Depletion on the Florida Mesa <br /> <br /> <br />The water supply fDr irrigatiDn Dn the Florida Mesa is prDvided by diver- <br /> <br /> <br />siDns thrDugh the FIDrida Canal and FIDrida Farmers Ditch. A listing Df monthly <br /> <br /> <br />diversiDns is presented in Appendix B. The irrigated area includes 16,814 acres. <br /> <br /> <br />The Dverall irrigatiDn efficiency Dn the FIDrida Mesa is increased by the reuse <br /> <br /> <br />Df return flows, resulting in an estimated 80 percent maximum irrigatiDn efficien- <br /> <br /> <br />cy. At times when the system is water shDrt, cDnsumptive use Df the irrigatiDn <br /> <br /> <br />water is limited by the maximum irrigatiDn efficiency. At times when a full <br /> <br />. <br /> <br />. <br /> <br />-12- <br /> <br />. <br /> <br />J; ., <br />