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• Design Calculations <br />The Magpie Creek drainage basin was divided into two (2) <br />subwatersheds for design purposes (Subwatershed No. 1 and <br />Subwatershed No. 2). Subwatershed No. 1 is the larger drainage <br />basin which empties into the diversion at its upper end. <br />Subwatershed No. 2 contains the tributary which empties into the <br />diversion at Station M as shown on the Magpie Creek Diversion As- <br />Built Drawing, (Map 25). Peak discharge values were calculated <br />for both subwatersheds using the SEDCAD+ computer model. The <br />methodology used and assumptions made are outlined in the <br />Methodology and Assumptions section of this exhibit. The upper <br />reach of the diversion is designed to pass the peak flow from <br />Subwatershed No. 1 and the lower reach is designed to pass the <br />peak discharge from both subwatersheds. The 100 year storm was <br />modeled using the most current version of SEDCAD (SEDCAD 4). <br />Subwatershed No. 1 <br />Hvdroloav InDlltS <br />Watershed Area: 885.2 acres <br />Time of Concentration (Tc) <br />Tc = 0.85 (refer to the SEDCAD Printouts on Table 19) <br />I~ <br />U <br />TR-32 l41 Revised 8/OL <br />