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<br />SHEEP DRAW HYDROLOGY
<br />WELD COUNTY, COLORADO
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<br />the hydrologic studies UIV BO-4f?D
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<br />1.
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<br />GENERAL.
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<br />This report is a continuation of
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<br />that are being made for the Cache la .Poudre River Companion Flood Plain
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<br />Information Study. Work Element J of the April 1977 Corps of Engineers
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<br />Plan of Study outlines the requirements of the Sheep Draw study. Dis-
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<br />charges for the 2-, 5-, 10-, 50-, 100-, and 500-year floods are required
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<br />for existing and urbanized conditions. The detention pond analysis described
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<br />in the Plan of Study will be performed by the Engineering Department of the
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<br />City of Greeley, Colorado.
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<br />2. BASIN DESCRIPTION. Sheep Draw, a right bank tributary to the Cache la
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<br />Poudre River, has its source near the Highway 34-257 intersection eight miles
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<br />west of Greeley, Colorado. From its source, Sheep Draw flows in a generally
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<br />northeasterly direction to business route #34, then north to its confluence
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<br />with the Cache la Poudre River. The l5-square-mile basin is primarily rural,
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<br />but is expected to urbanize within the next few years. Elevations in,the basin
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<br />range from 4,690 to 5,050 feet above mean sea level. A map of the Sheep Draw basin
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<br />is shown on attachment 1.
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<br />3. EXISTING STRUCTURES. Four reservoirs were considered in the hydrologic
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<br />analysis of the basin. One is on Sheep Draw in section 13, approximately one
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<br />mile upstream from Highway #34. Two others are located on tributaries in
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<br />section 13. Another reservoir is on a tributary in section 4, approximately
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<br />one mile above the mouth of Sheep Draw. During late spring and summer, water
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<br />from these reservoirs is used to irrigate nearby crop land. Although flood
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<br />control is not a specific function of the reservoirs; some residual flood
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<br />control effects are provided downstream. Two canals, Boomerang Ditch and
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