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n~~I~~O ~) 1.1 ~) ~J '~. . . . C. Reach 3 - Just downstream from Lemon Reservoir to the Florida River below the Florida Farmers Ditch gage. The reach includes runoff contributions from the following areas: lJ-V Drainage Area (square miles) 6.9 7.7 24.6 Average Annual Runoff per sq. mile 350 320 130 ,~ Location Shearer Creek Red Creek Misce II aneous Y: \~ /\ ( \ \0' V. Inigated Areas \ Reach 1 - 149 acres (mainstem) - 3,102 acres (Salt Creek) Reach 2 - 1,413 acres Reach 3 - 476 acres (in area between Lemon Reservoir and the Florida Canal) - 16,814 acres (Florida Mesa) - City of Durango municipal diversions A detailed listing of inigated areas is included in Tables 2 through 6. VI. Stream Depletion A. City of Durango diversions All diversions by Durango to result in a depletion to the Florida River. A discussion of Durango diversions are presented in the "Summary of Animas River Model." Monthly estimated diversions are presented herein as Table 7. B. Consumptive use of inigation water The potential consumptive use of irrigation water in the Florida River basin and in the Florida Mesa area was estimated through the calibrated use of the modified Blaney-Criddle method. The crop mixture used in the calculations included pasture grass-alfalfa (95 percent), corn (2.5 percent), and wheat (2.5 percent). Listings of potential consumptive use for the crop mixture and the individual crops are included in Tables 8 through 11. C. Inigated areas upstream of Florida Canal Irrigated areas along the Florida River and its tributaries are located near the stream channel. Groundwater and surface water return flows were estimated to return to the river within one month, resulting in a negligible return flow lag. Thus, stream depletion associated with irrigation was estimated to be approximately equivalent to the monthly consumptive use values. The water supply for irrigation ;.,