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MID-CONTINENT RESOURCES , INC . <br /> INTEROFFICE CORRESPONDENCE <br /> TO: DIANE DELANEY <br /> SUBJECT: OLD REFUSE PILE 100-YR CLEAN WATER DIVERSION DITCH <br /> FROM: JOHN A. REEVES, JR. <br /> DATE: JULY 19, 1993 <br /> Attached is a map at a scale of 1" = 400 ' showing the route of the <br /> required 100-year 24-hr storm, diversion ditch on the south and <br /> southwest sides of the old refuse pile . <br /> Also attached are calculations regarding the size of this ditch. <br /> These calculations are based on the following : <br /> 100-yr 24-hr precipitation event : 3 . 6 inches <br /> area drained : 7 . 56 acres <br /> runoff coefficient : 0 . 90 <br /> for alluvial silts-colloidal : <br /> VD: 3 . 75 <br /> Manning 's n: 0 . 0250 <br /> The ditch dimensions resulting from subsequent calculations are : <br /> depth: 0 . 0635 ft <br /> width of bed : 4 . 94 ft . <br /> Add 0 . 94 ft of freeboard for safety factor, for total height of 1 . 0 <br /> ft . <br />