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SHAW CREEK CONDOMINIUh"3 <br />TIME OF CONCENTRATION <br />PRE DEVELOPED CONDITIOMS <br />BASIN NO. 1 <br />Sheet Flow (Applfcable to Tc <br />Surface Uescription <br />_ -- - <br />Manning's Roughness CoeKcient nsheet <br />Flow Length (L<=300'�, Lsheet_ _ _ <br />2-Year, 24-Hour Rainfall, P2 <br />__ _--.. _ __ <br />Land Slope, Ssheet <br />Tt Sheet <br />Tt Sheet <br />Lawn <br />--- -�0.170 _ _ . <br />__�100 feet <br />!1.55inches <br />-- - <br />--- - 0.023 fUR <br />- -- -.— - - <br />0.25 hours <br />14.84 minutes <br />Shallow Concentrated Flow (Per Everett SWM Manual, <br />ce Description <br />Length, Lshallow _ ____ <br />�course Slope, So __. <br />of ConceMration Velocity Factor, k _ <br />�ge Velocity, Vshallow = k x So^0.5 <br />Tt Shallow <br />Tt Shallow <br />Channel Flow (PerEverett SWM Manual, Pa9e1•5-4) <br />Type of Channel <br />Flow Length, Lchannel _ _ _ <br />Watercourse Slope, So _ _ <br />Time of Concentration Velocity Factor, kc <br />Average Velocity, Vchannel = k x So^0.5 <br />Channel <br />Channel <br />Results: Watershed or Su6area Tc or Tt <br />Total Tc or Tt 0.36 hours <br />Tolal Tc or Tt 21.72 minutes <br />Light Woods <br />0.130 <br />100 feet <br />1.55 inches <br />0.090 fl/ft <br />0.11 hours <br />6.88 minutas <br />Paved <br />0 ft <br />0.000 fUR <br />27 00 <br />0.00 fps <br />0.00 hours <br />0.00 minutes <br />0fl <br />0.000 fUR <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 />\1'c6bJUc�Calc�l� 30 IR7/:000 ��� <br />x� <br />