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• i. PROJECT LOCATION AND DESCRIPTION <br />This analysts was performed on the Loma Prospect for Sheridan <br />Enterprises, Inc.., located in Garfield County, Colorado, to a historic <br />drainage sub-basin which drains to Munger Creek and into East Salt Creek. <br />This sub-basin Is in turn divided into smaller watersheds for calculations. <br />II. METHOD OF ANALYSIS AND PROCEDURE <br />Runoff rates were calculated based upon the methods presented in <br />Technical Manual No. 1, a Manual for Estimating Flood Characteristics <br />of Natural-flow Streams In Colorado. The U.S. Geological Survey prepared <br />this manual in cooperation with the Colorado Water Conservation Board. <br />The Loma Prospect is located on a stream that is not near a Gaged Site <br />with reference to the manual. Therefore regression equations.are explained <br />and derived in the manual. <br />• The site Is located in the Southern Plateau Region, one of four <br />regions Colorado Ts divided into by the manual. The Southern Plateau <br />Region comprises most of Southwestern Colorado and includes the tribu- <br />Caries of the Colorado River up to an elevation of 7,500 feet. <br />The Drainage Aspects drawing shows the watersheds within the entire <br />drainage basin surrounding the Loma site. Runoff was calculated with <br />reference to the manual for each watershed. Size of culverts to pass <br />flow under access road was based upon this runoff quantity. <br />A 10-year flow was used for the design year return period. All <br />calculations are Included In a latter part of this report. <br />u <br />~j_ <br />