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TIME OF CONCENTRATION <br />PERVIOUS AREAS <br />Sheet Flow (Appllcable to Tc only) <br />Surface Description <br />Manning's Roughness Coefficient, nsheet <br />Flow Length (L<=300'), Lsheet <br />2-Year, 24-Hour Rainfall, P2 <br />Land Slope, Ssheet <br />Tt Sheet <br />Tt Sheet <br />Shallow Concentrated Flow (See DUE SWM <br />Surface Description <br />Flow Length, Lshallow <br />Watercourse Slope, So <br />Time of Concentration Velocity Factor, k <br />Average Velocity, Vshallow = k x So^0.5 <br />Tt Shallow <br />Tt Shallow <br />Channel Flow (See DOE SWM Manual, <br />Type of Channel <br />Fiow Length, Lchannel <br />Watercourse Slope, So <br />Time of Concentration Velocity Factor, kc <br />Average Velocity, Vchannel = k x So^0.5 <br />Tt Channel <br />Tt Channel __ <br />Results: Watenhed or Subarea Tc or Tt <br />Total Tc or Tt <br />Total Tc or Tt _ <br />Minimum Tc Used in Basin File ___ <br />5.066 <br />houn <br />Storm Drain <br />82 ft - <br />0.0610 fUft <br />42.00 <br />10.37 fps <br />0.00 hours <br />0.13 min. <br />Note: <br />1. Wurksheet based on time equations irom Stormwater Management Manual for the <br />Puget Sound Dasin, Chapter III <br />Lawn <br />0.150 <br />20 feet <br />1.�0 inches <br />0.0200 ft/ft <br />0.07 hours <br />3.95 min. <br />Grass <br />45fl <br />0.0100 ft/ft <br />27.00 <br />2.70 fps <br />0.00 hours <br />0.28 min. <br />torm Drain <br />76 ft <br />0170 fUft <br />4P fps <br />01 hours <br />84 min. <br />Maplewoo.lDet('elc xls 9 B/9/ID07 <br />