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Some of the factors considered in the final design were: <br />wetland and steep slope huffer zones, location and sizing <br />requirements of the detention structures, maintenance <br />requirements, etc. The design ultimately selected <br />represents the most workable solution given the many <br />design constraints presented above. For this project, the <br />site is divided into three major basin; northwest parking <br />area (basin 1), roof drainage from the proposed 40-04 and <br />40-06 buildings (basin 2), and the southwest parking area <br />(basin 3). <br />Detention structures, consisting of two excavated, wet <br />pond type detention basins, are utilized with appropriate <br />f outlet control devices to provide the necessary storage <br />which will attenuate the off site peak discharge rate <br />for the 25-year frequency, 24-hour duration storm event. <br />Drawing Number SK-C2.0 depicts the three basin areas and <br />includes: basin boundaries, flow paths, points of <br />discharge and location of detention structures. <br />Areas within each basin were determined based on land <br />use/cover conditions and categorized as either pervious <br />or impervious areas. The effective widths of each basin <br />area was determined using procedures outlined on Page 102 <br />of the SWMM manual. The information for each basin area <br />is shown in the following summary: <br />11 <br />