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<br />WATER RESOURCES <br />Introduction <br />Information in this report covers the East Rigden site and land <br />east to I-25. Flatiron's long range mining plan includes the <br />entire area, and this study was conducted so that water surface <br />could be minimized and a regional drainage plan could be laid <br />out. The intent is to limit evaporative loss of water. In <br />this water resources section only the information on East Rigden <br />is pertinent to this permit application. <br />Surface Water <br />The Cache la Poudre River is the principle surface water feature <br />in the vicinity of the mining site. The stream originates near <br />the Continental Divide to the west of Fort Collins and drains <br />approximately 1100 square miles above the mining site. The <br />U.S. Geological Survey maintains three stream gauges on the <br />Cache la Poudre River. These are located at the mouth of the <br />canyon near Fort Collins, at Fort Collins and near Greeley. <br />Daily streamflow records are available for the gauge at Fort <br />Collins from April, 1975 through the present time. The maximum <br />discharg•~ measured during the period of record for this site <br />was 5700 cfs on August 1, 1976. The minimum daily flow was 1.8 <br />cfs measured May 12, 1976. Just upstream of the mining site, <br />a stretch of the river is sometimes dried up by diversions of <br />the Fossil Creek Reservoir Inlet and the Boxelder Ditch. The <br />spring and summer runoff results from snow melt in the mountains <br />and comprises approximately 758 of the annual discharge. The <br />G-1 <br />