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Check R using d = 1 . 5 , b = 7 . 0 , z = 2 <br /> bd + Zd2 <br /> R = ------------- R = 1 . 094 , lower than 1 . 27 so <br /> 2xd,r(z2+1 ) design is O. K . <br /> Using Manning ' s equation to check design with inputs of : <br /> b = 7 . 0 <br /> n = . 049 <br /> d = 1 . 50 <br /> S = 0 . 0468 <br /> Z = 2 . 0 <br /> yields an area of 15 ft2 , a velocity of 6 . °8 ft/sec , a flow of <br /> 104 . 78 cfs and a hydraulic radius of 1 . 094 . Therefore, the design <br /> is acceptable . A cross-section of the diversion is shown on Exhibit <br /> 2 . A freeboard of 0 . 3 feet is added to the deign depth . <br /> Initial Bend Around Refuse Pile <br /> From Station 0+90 to Station 1+30 , the diversion makes a sharp turn <br /> near the northern edge of the refuse pile . For the 100 year event , <br /> this bend is critical and must be armored with rip-rap . A D�, of 3. 0 <br /> feet is selected and the outside bank of the channel at this point <br /> will be increased to 4 . 0 feet high . <br /> Also , Exhibit 1 shows a small branch of the Sutey Diversion that <br /> begins at a spring at the northern end of the refuse pile . This <br /> clean water must be channeled into the Diversion on a steady grade <br /> since the spring is approximately 8 feet lower than the diversion . <br /> No design is given for this ditch leading to the main Sutey <br /> Diversion . The spring flows less than 0 . 5 cfs at its peak and the <br /> grade of the branch is very mild , less than 2%. <br /> 13 �3 <br />