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i <br />NORDBLOM & ASSOCIATES inc <br />ARCHITECTS <br />^ 12450 WAV2ATA fiOULEVARO <br />MINNETONKA. MN 55343 <br />DONALD O. NORDBLOM A.f.#4-TELEPHONE 612 #546 5573 <br />SURFACE DRAINAGE - PONDDJO AREA CALCULATIONS FOR TOE LOVTT.T, ZITZLOFF <br />BUILDING, OHONO, MINNESOTA <br />June 19, 1979 <br />Maximum conciltlan of design is based on the one hundred year storm, <br />vhich Is six Inches of rain over a twenty four hour period, or a peak <br />hourly rate of four inches. <br />Total site area • 200'xl75' - 35,000 total square feet. <br />35,000 X ■ 17,500 cubic feet of run off water <br />Drainage pond area • 2,961 square feet <br />12 xSffi ■ 5.9 min. ponding area depth to contain run off water from <br />,9ol one hundred year storm. <br />Roof design vlU be such that a limited amount of water will be re­ <br />tained for removal by evaporation. The pond will be approximately <br />71-0" deep average to conqiensate for water already being held. <br />Approx, edge of pond elevation would be 93h'-0". Bottom of pond <br />elevation would be approx. 927'-0" or five foot lower than existing <br />Srade. A chain link fence would be installed around pond for safety. <br />Soil percolation and actual water table elevation, adjacent site <br />drainage, will have to be Investigated before finialising drainage design. <br />y^4u.*Y-*/ ct //| /I7y <br />/ <br />% <br />!