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Based on that assumption, 39.5 acre-feet of water would be <br />' repla~:ed. An augmentation plan will be filed with the State <br />Engineer for approval in water court. The approved plan will be <br />proof that no senior water right owwers will be damaged by the <br />proposed mining operation. <br />As shown on Figure G, there are several wells located near the <br />proposed gravel pit. A study area of one mile in radius was <br />' selected to locate water rights. Water rights located on <br />opposite sides of Boulder Creek or St. Vrain Creek are not shown <br />because the creeks form a hydrologic boundary. The wells shown <br />' appear to be far enough from the pit that the drawdown influenced <br />from clewatering the pit will not materially damage them. <br />Water Rights <br />' The C & H Companies currently holds water rights for the Coffin <br />and Davis Ditch. This ditch has diversion rights on Dry Creek, a <br />' tributary of St. Vrain Creek. This ditch has an appropriation <br />date of June 1, 1866 and was adjudicated by the Water Court on <br />June 2, 1882. The ditch currently serves three property owners, <br />' the Distel farm being one of them. The total diversion allowed <br />is 17.3 cfs with 30.9 of the diversion right belonging to the <br />Distel Farm. <br /> There are only three years of diversion records available for the <br />' Coffin and Davis Ditch. These records are for water years 1985, <br /> 1986 and 1987. The average annual diversion for the three years <br /> of record was 658 acre-feet. A comparison of diversion records <br />' to annual basin yield was performed. The results of this <br /> estimate showed a long term diversion yield of 614 acre-feet. <br /> Based on irrigable acreage, this gave approxi mately 1.90 acre- <br />' feet per acre. <br /> The consumptive use for irrigation water in thi s general area is <br /> 50°s of the total diversion. This would yield 0. <br />acre of irrigated land. There are 104 acres of 95 acre-feet per <br />land irrigated by <br /> the Distel Farm with this ditch. Therefore, a total of 98.8 <br /> acre-feet of water would be available for use on the project. <br /> <br /> A comparison of the amount available to the projected demands <br /> shows that there will be adequate supplies if the above <br /> assumptions are correct. <br />1 <br />1 <br />' G-4 <br /> <br /> <br />