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I <br /> Stormwater Management Report Everett, WA <br /> I <br /> Conveyance <br /> IOn-site conveyance calculation: <br /> On-site stormwater conveyance has been calculated through gravity flow analysis of the <br /> I piping network. Based on a 100-year storm event, peak runoff of 2.249 cfs was routed <br /> through the system and determined to be adequate. The minimum slope of 0.5% was <br /> I used to check the capacity of the system. This ensures that a 12" pipe will be capable of <br /> conveying the peak runoff rate at any slope greater than 0.5%. The see the figure below <br /> for conveyance calculations using the hydrology function in AutoCAD 2007: <br /> p <br /> IManningski <br /> ISolve For Depth of Flow v <br /> Flowrate ci: 2.2490 Pipe Shape: Circular <br /> Slope tt/It 0.0050 I Select <br /> (_______a__ <br /> I Manning's n 0.0110 I Select <br /> Depth of Flow in <br /> Diameter in 12.0000 I Select <br /> l Plot _--1 <br /> 1 Velocity Area fps <br /> ft2 4.1662 <br /> 0.7854 <br /> Output <br /> _ <br /> Perimeter in 37.6991 Critical j <br /> IWetted Area ft2 0.5398 Rating <br /> Wetted Perimeter in 22.4902 L OK <br /> IHydraulic Radius in 3.4564 Cancel <br /> Percent Full % 64.9377 I Help <br /> I <br /> I <br /> I <br /> I <br /> IIPACLAND Job # 50108001 Page 19 <br />