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<br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />calculated using the coefficients defined in Table 3-1 of Section <br />3.6 "Runoff," Volume 1 of the USDCM, "Undeveloped Areas - Off-site <br />Flow Analysis.". Credit may be allowed for on-site detention in the <br />off-site area as defined in the associated Master Plan. <br /> <br />Where the off-site area is fully or partially developed, the storm <br />runoff shall be based upon the existing platted land uses and <br />topographic features. Credit may be allowed for on-site detention <br />in the undeveloped off-site area for any design frequency. <br /> <br />4.4.4 <br /> <br />Tributarv Area Not within A Major Drainaaeway Basin <br /> <br />Where the off-site area is undeveloped, storm runoff shall be <br />calculated assuming a fully developed basin as defined by the City. <br />If this information is not available, then the runoff will be <br />calculated as stated in Section 4.4.3, without credit for on-site <br />detention in the off-site area. <br /> <br />Where the off-site area is fully or partially developed, storm <br />runoff for the developed area shall be based on the existing <br />platted land uses and topographic features. Credit may be allowed <br />for on-site detention in the developed off-site areas provided it <br />has been constructed and accepted by the City. Storm runoff for <br />the undeveloped areas shall be calculated assuming full development <br />as defined by the City. No credit will be given for on-site <br />detention in the undeveloped off-site area. <br /> <br />4.5 Channel Routing <br /> <br />Whenever a larger or non-homogeneous watershed is being <br />investigated, it is necessary to segment the watershed into smaller <br />and somewhat homogeneous sub-basins. The storm hydrograph for each <br />sub-basin can then be calculated by the CUHP methodology as <br />explained in the USDCM, Volume 1 "Runoff" . It is up to the <br />engineer to route and combine the individual sub-basin hydro graphs <br />to calculate a storm hydrograph for the entire watershed. There <br />are several methods commonly used in channel routing that include: <br /> <br />· Direct Translation <br />· Convex <br />· Muskingum <br />· Storage-Discharge (Modified PuIs) <br />· Kinematic Wave <br />. Diffusion Wave <br />· Dynamic Wave <br /> <br />4-3 <br />