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in the SEDCAD+ User's Manual (Schwab and Warner, 1981, page 113), the time <br />• of concentration restriction of 0.125 hours is somewhat mandated due to a <br />combination of array size restrictions, minimum internal convolution <br />interval, and the user-specified time increment for saving convoluted <br />values. <br />.Drainage Basin Area <br />The drainage areas are determined by direct measurement by planimetering <br />from a 1"=200' scale map. Areas were measured on a subwatershed basis for <br />the North and South refuse collection ditches. An individual ditch <br />section receives runoff from its corresponding sub-basins, and runoff <br />contributed from the up-slope ditch sections. Sedimentation Pond No. 4 <br />receives runoff contributed by all the refuse collection ditches, a small <br />area surrounding the pond, and precipitation on the pond itself. Magpie <br />Creek Diversion receives runoff from two (2) subwatersheds. The <br />cumulative basin areas draining to each ditch and diversion section and <br />Sedimentation Pond No. 4 are as follows: <br />• <br />Drainage Structure <br />Permanent Diversion No. 1 <br />West Refuse Collection Ditch <br />*North Refuse Collection Ditch <br />South Refuse Collection Ditch <br />Sedimentation Pond No. 1 <br />**Sedimentation Pond No. 4 <br />Sedimentation Pond No. 5 <br />Magpie Creek Diversion <br />Section Drainage Area (acres) <br />A, B, C 51.48 <br />A, B, C 6.06 <br />A 10.51 <br />B 14.68 <br />C 20.32 <br />A 9.18 <br />B 9.95 <br />C 12.11 <br />D 19.81 <br /> 9.98 <br /> 42.85 <br /> 32.00 <br />Upper 885.20 <br />Lower 1336.10 <br />• * Areas include the 6.06 acres contributed by the west refuse collection <br />ditch. <br />7 R Revised - December, 1991 <br />