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maximum depth of 2.5 feet and an average depth not exceeding 2.0 feet, is required to <br />be associated with the :reatment cell. <br />The calculation package de[errnines the 6 month, 24-hour hydrogrzph volume (the <br />wetpond design volume) by taking 64% of t}�e 2 year, 24-hour hydrograph volume. <br />This approach is conservative - it is the 6 month precipitation amount that is 64% of <br />the 2 year amount; the 6 month runoff volume is a lesser percentage of the 2 year <br />runoff volume, depending upon a site's [ime of concentration and curve numbers. <br />City standards require a 72 inch catch basin with 4 feet of catch to be located upstream <br />of the wetpond. <br />The pond location and design should be approved by a geotecfmical engineer, <br />especially given its location in a fill area. Unless a geotechnical engineer approves <br />otherwise, the pond must be lined to prevent saturation and possible failure of the fill <br />slope. <br />