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Everett LDS Parking Lot Expansion <br />Storm Drainage Report <br />Conveyance Capacitv Analysis <br />Manning's Equation assuming uniform flow: <br />Pipe (12" diameter pipe a 0.5% minimum allowable design slope): <br />rGiven Input Data: <br />Shape ........................... <br />Circular <br />Solving for ..................... <br />Flowrate <br />Diameter ........................ <br />1.0000 ft <br />Depth ........................... <br />1.0000 ft <br />Slope ........................... <br />0.0050 ft/ft <br />Manning's n ..................... <br />0.0120 <br />Computed Results: <br />Flowrale ........................ 2. 7292 CA <br />Area ............................ <br />0.7854 112 <br />Wetted Area ..................... <br />0.7854 112 <br />Wetted Perimeter ................ <br />3.1416 ft <br />Perimeter ....................... <br />3.1416 ft <br />Velocity ........................ <br />3.4750 fps <br />Hydraulic Radius ................ <br />0.2500 ft <br />Percent Full .................... <br />100.0000 % <br />Full now Flowrate <br />.............. 2.7292 cfs <br />Full flow velocity .............. <br />3.4750 fps <br />Critical Information <br />Critical depth .................. <br />0.8350 ft <br />Critical slope .................. <br />0.0068 ft/ft <br />Critical velocity ............... <br />5.3070 fps <br />Critical area ................... <br />0.7277 112 <br />Critical perimeter .............. <br />2.2407 ft <br />Critical hydraulic radius ....... 0.3247 R <br />Critical top width .............. <br />1.0000 ft <br />Specific energy ................. <br />1.2908 ft <br />Mininmm enorgy .................. <br />1.2525 ft <br />Froude number ................... <br />0.8072 <br />Flow condition .................. Subcritical <br />�Pipc Flow Capacity = 2.71 cfs > 0.78 cfs 100 yr utidetuiued developed I <br />Note that Manning's Flow capacity assumes the minimum 0.5% allowable design slope for pipe. Based <br />on the above analysis and assumptions, all proposed storm systems for the project will have adequate <br />capacity to convey estimated Flows. <br />P:12006.06113 Evamt Los Parking WhToKnstorm Reports 06113 Drainage moon NewseJ 01.10.08.a« Page 24 of 36 <br />