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road with Mirafi 600X placed underneath the gravel an a prepared subgrade to <br />stabilize the roadbed for winter and wet weather travel and also to prevent <br />erosion. A short portion (approximately 600 ft.) will be relocated about 10 <br />to 30 feet at the fan site. This relocated portion will be of the same <br />construction as the existing road (gravel and Mirafi 600X). Ta accomplish the <br />relocation only minor grading will be required and a small berm will be <br />constructed along the outside edge of the relocated portion of the road. The <br />existing road will not be widened nor will cut or fill be required. The <br />relocated portion will be constructed to the same width as the existing road <br />(approx. 12 ft.). <br />CALCULATION METHODS <br />• Peak discharges from drainage areas were determined using "Procedures for <br />Determining Peak Flows in Colorado - Includes and Supplements - Technicai <br />Release No. 55, Urban Hydrology for Sma11 Watersheds", Soil Conservation <br />Service, U.S. Department of Agriculture, 1980. <br />Channel designs were carried out using equations and other data contained in <br />"Applied Hydrology and Sedimentology for Disturbed Areas°, Barfield, Warner, <br />and Haan, 1981. <br />Culvert sizes were estimated using Mear's Water Flow Calculator for pipes, <br />ducts, and sewers using the rational formula and Moady's pipe roughness and <br />frictional coefficients for various materials. <br />• Drainage areas were determined by planimeter. <br />(2) <br />