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Irrigation Requirements and Water Supplies Sources of Data There are several studies which include estimates of irrigation require- ments in the general vicinity of the Florida project. Among these studies are: (1) Appendix B of the Record of the Upper Colorado River Basin Compact Commission; (2) ConstUllptive Use and Irrigation Water Requirements of Crops in Colorado, by Harry F. Blaney and Wayne D. Criddle; and 0) ConstUllptive Use of Water in the Irrigated Areas of the Upper Colorado River Basin, by Blaney and Criddle. Addi tional related information is contained in the Water Supply Papers of the U.S. Geological Survey, Climatological Data by the U.S. Weather Bureau, Colorado Heat and Moisture Indexes for Use in Land Capability Classification by the Soil Conservation Service, and other publications. These and other available related reports were carefully reviewed for the purpose of this study. In addi tion, information was supplied by techni cians of the Colorado State Universi ty, Colorado Agri- cultural Experiment Station, Colorado Cooperative Extension Service, Colorado State Engineer, Agricultural Research Service, U.S. Bureau of Reclamation, U.S. Soil Cbnservation Service, and others familiar with the area. Analysis of Data ConstUllptive use requirements for the principal crops in the area were estimated by the Blaney-Criddle procedures (table 4). The various irriga- tion water losses expected wi thin the project were estimated by considering soil characteristics and site locations. Total farm water requirements were estimated by adding on-farm losses to the basic constUllptive use estimates weighted by projected crop acreage distribution (table 5). Table 4. - Estimate of constUllptive use requirements for major crops, Florida project . . Alfalfa Pasture Corn SIlall grain : : Frost-free period Consumpti ve use coeffi cient .85 .75 .75 .75 Consumptive use factor 22.74 22.74 22.74 19.04 ConstUllptive use, ac. ins./ac. 19.32 17.05 17.05 14.28 Nonfrost-free period Consumptive use coefficient .70 .60 ----- ----- Consumptive use factor 8.44 8.44 ----- ----- Consumptive use, ac. ins./ac. 5.90 5.06 ----- ----- Total constUllptive use, ac. ins./ac. 25.22 22.11 17.05 14.28 Effective seasonal precipitation, ins. 5.88 5.88 4.30 3.38 Net constUllpti ve use requirements, ac. ins./ac. 19.34 16.23 12.75 10.90 - 13 -