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SHAW CREEK CONDOMINIUMS <br />TIME OF CONCENTRATION <br />POST DEVELOPED CONDITIONS <br />BASIN NO. 1 <br />Sheet Flow (Appllcab/e to Te on/y) <br />Surface Description <br />Manning's Roughness Coefficient, nsheet <br />_ _. ----- ---- - <br />Flow Length (L<=300'), Lsheet <br />-- — - __ - -- -- — <br />2-Year, 24-Hour Rainfall, P2 <br />_ _ _ ---- ---- <br />Land Slope, Ssheet <br />Tt Sheet - - - - ----- - - - - --- <br />Tt Sheet <br />Shallow Concontreted F/ow (Per Evereft SWM Manual, Page 1-5•4) <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 (Per Everett SWM Manual, Page1•5-4J <br />Type of Channel <br />Flow Length,Lchannel <br />Watercourse Slope, So _ , _ <br />Time of Concentretion Velocity Factor, kc <br />Average Velocity, Vchannel = k x So^0.5 . <br />Tt Channel <br />Tt Channel <br />Resu/ts: Watershed or Subarea Te or Tt <br />Total Tc or Tt 0.18 hours <br />Total Tc or Tt �70.67 minutes <br />Lawn <br />0.170 . <br />30 feet <br />�- ------ <br />7.55 inches <br />•0.010 ft/R <br />0.13 hours <br />7.84 minutes <br />Paved <br />325 ft <br />0.005 ft/R <br />27.00 <br />1.91 fps <br />0.05 hours <br />2.84 minutes <br />Oft <br />- -- - --- -- <br />0.000 ft/R <br />---- <br />24.00 <br />- - 0.00 fps <br />0.00 hours <br />0.00 minutes <br />Note: <br />1 Worksheet based on time equations from Everett Stormwater Management Manual, <br />Chapter 1 <br />N�chhJUaCalc �I, 3 � IR7ROOU � <br />� <br />