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I <br />Page 27 of 29 <br />VIII. Miscellaneous Forms and Worksheets <br />1 CONVEYANCE SYSTEM ANALYSIS AND DESIGN: <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I" <br />I <br />I <br />Flow Frequency Return Periods for Developed Mitigated <br />Return Period <br />Flow(cfs) <br />2 year <br />0.650203 <br />5 year <br />0.935714 <br />10 yaar <br />1.145537 <br />25 year <br />1.434644 <br />50 year <br />1.667723 <br />100 year <br />1.916248 <br />The conveyance system for this project is all 12-inch. The 25-year storm (1.43 cfs) will <br />require approximately 0.3 feet of head to convey. A 12-inch pipe at 0.5% slope can <br />convey 3.5 cfs before headwater is 1.5 feet deep. Therefore, the 12-inch pipe is adequate <br />through out this project. <br />