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• <br />Mrs. Judy Sappington <br />State Engineer's Office <br />August 25, 1992 <br />Page 5 <br />C~ <br />Table No. 2 is a list of the headgate diversions for the 15 year <br />period of 1976 to 1990 for the Boyd and Freeman Ditch as reported <br />by the State Engineer's Office. The fifteen year average annual <br />diversion for the subject period is 1,106 acre-feet. The pro-rated <br />average annual diversion for the 240 shares equates to 267 acre- <br />feet. <br />It has been assumed the ditch seepage and evaporation losses are <br />108 of the total headgate diversions. It has also been assumed the <br />2`.arm efficiency has been 558. Therefore, the total overall <br />efficiency, the quantity of headgate diversions that are consumed <br />by evapotranspiration, is 508. <br />The average water supply to the subject farm during the study <br />period is 133.7 acre-feet of consumptive use. <br />A Blaney Griddle analysis was performed for the period 1976-1990 <br />for the site to determine the potential crop consumptive use. The <br />primary crop grown on the site for many years is pasture grass. <br />The results of the analysis are listed on Table No. 3. The average <br />annual consumptive use for pasture grass for the site is 24.51 <br />during the study period. <br />Approximately H5 acres are irrigated on the subject site. <br />Therefore, the average demand of water during the study period is <br />173.6 acre-feet. <br />Table No. 4 lists the available replacement water from the 240 <br />shares of the Boyd and Freeman Ditch. The monthly historic <br />consumptive use, available replacement water, is equal to the water <br />demand or the water supply whichever is less for each month. The <br />annual consumptive use is 133.6 acre-feet or 1.57 acre-feet per <br />acre. <br />2. Method of Replncemeat <br />A minimum of ten acres of pasture grass will be dried up and <br />monumented to the satisfaction of the local Water Commissioner. <br />Ten acres equates to 15.7 acre-feet of consumptive use. <br />water not used due to the dry up of the ten acres of pasture grass <br />will be passed through the ditch and will be diverted back to the <br />Cache La Poudre River. The ditch ends at 35th Avenue and any <br />excess water in the ditch is carried in a large stormwater ditch <br />which runs on the east aide of 35th Avenue. The waste ditch flows <br />directly north until it reaches the river, <br />