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<br /> <br />References <br />1. Merritt, Frederick, Standard Handbook for Civil Engineers <br />2. Seelye, Elwyn, Data Book for Civil Engineers <br />3. Yamell, Engineering Manual of the War Department, December 1945 <br />Rational Formula - Q = C I A <br />Where: <br />Q =peak discharge (flow), cfs <br />C =runoff coefficient <br />I =rainfall intensity, in/hr <br />A =drainage area, acres <br />Manning's Equation - Q = (1.486/n) A R"' S"' <br />Where: <br />Q =discharge (flow), cfs <br />1.486 =unit conversion <br />n =roughness coefficient <br />A =area, ft' <br />R =hydraulic radius, ft <br />S =slope <br />Steel Formula - I = K/ (t + b) <br />Where: <br />I =rainfall intensity, in/hr <br />t =duration of storm, min <br />K and b are values dependent on the storm frequency and the U.S. region <br />where the site is located <br />Rainfall intensity is determined using Seelye Table 21-17 (page 21-84) and the Steel <br />Formula. The Piceance Site is located between geographical areas 6 and 7. Therefore the <br />rainfall intensity would be the average of the intensities for Areas 6 and 7. <br />For Region 6 k = 210, b = 26 <br />For Region 7 k = 77, b = 10 <br />Overland flow times for drainage areas are determined using the Yamell Figure H, <br />Overland Flow Time. Input data are the length of flow path, character of the ground <br />surface, and percent slope. <br />2 <br />Summary of Kvaemer Calculations <br />Piceance Site Diversion Ditch System <br />Technical Revision Mining and Reclamation Permit <br />