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. . CHAPTER IV WATER . Water Reauirements The potential consumptive use (CU) of water for crops In the Julesburg area was calculated using the mocmied Blaney-Criddle method, and long-term temperature and precipnation data for the Julesburg weather station Oisted in Table 1), The precipnation which is effective for meeting a portion of crop potential CU requirements was determined using techniques described in SCS Technical Release No, 21, The monthly recorded and effective precipitation values for the Julesburg area are listed In Table 6. . . The average potential consumptive use requirement for the crop distribution shown In Table 5 is 2,08 acre-feet per acre per year, The consumptive use requirement for irrigation water was determined by subtracting the effective precipitation from the potential CU of water on a month by month basis for each crop during its respective growing period, The average annual CU requirement for irrigation water for the weighted crop distribution is 1.41 acre-feet per acre. On 18,751 acres, the annual CU requirement would be 26,439 acre-feet per year, Monthly CU values are also listed in Table 6, . . Generally, the project water is delivered to the field using flood irrigation methods, Under flood irrigation, field irrigation efficiencies are estimated to be about 60 percent. Assuming the 60 percent efficiency, the total farm head gate requirement would be 44,066 acre-feet per year for the 18,751 irrigated acres, with the assumed crop distribution listed in Table 5. The monthly farm headgate requirements are summarized in the last column of Table 6, . . Surface Water SUDDlv The water supply for Julesburg Reservoir is delivered through the Harmony Ditch No, 1 which diverts from the South Platte River in the vicinity of Crook, Colorado. The diversion point is located about halfway between the South Platte River at the Balzac stream gaging station (upstream) and the South Platte River at Julesburg stream gaging station (downstream), Historic monthly streamflow data as recorded at the two gages are presented in Appendix E for a 20-year study period which extends from 1970 through 1989, Streamflow along the Platte River in the . 8 .