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After the minimum storage volumes were determined, the <br />requirements for permanent storage in the wet cells was <br />addressed. In both the north and south ponds, the volume <br />requirements for permanent storage in the wet cells <br />could not be met using the pond volumes in the "Extran" <br />routing program. Therefore, the size of the ponds were <br />increased to meet the minimum permanent storage volume <br />requirements. <br />A. NORTH DETENTION POND <br />The north detention pond is designed to provide storage <br />and peak runoff control for storm water runoff occurring <br />on the northwest parking area and roof drainage from the <br />proposed 40-04 and 40-06 buildings. The runoff will enter <br />the basin as shown on SK-C2.0. The results of the peak <br />rate inflow hydrographs for the 25-year, 24-hour storm (p <br />events for each of the basin areas are given in Table 4 IhP Id <br />r5 m a� �S <br />and Table 5 of this report. ,The r rirr ce used ��, � pu <br />for the north -basin -is an orifice controlled stand-pipee <br />A 7-5/32 inch diameter orifice is used as the primary 0 <br />control device. This orifice is located on the bottom of to <br />the standpipe with an effective design head of 3.0 feet. <br />21 <br />