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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />... <br /> <br />SCS TR-SS Methodolooy <br />Q = (P-0,2S)'/(P+0.8S) <br />S=(1000/CN)-10 <br />qp = Q,AQ <br /> <br />HYdrolooy Calculations <br />Town of Granby <br />Basin BS <br /> <br />where: <br />Q = runoff depth (inches) <br />S = potential abstraction <br />CN = SCS Curve Number <br />A = drainage area (acres) <br />P = rainfall depth (inches) <br />Q u = Unit Peak Discharge (cfs/sm/in) <br /> <br />Catchment Data <br />Location I Western Colorado (II) <br />Catchment 10 = <br />Basin Area, A = <br />NRCS Soil Type = <br />Oyerland Flow Type <br />Runoff Depths <br />Storm <br />Rainfall Frequency (years) <br />Rainfall Duration (hours) <br />Rainfall Depth, P (inches) <br /> <br />Weighted Curve Numbers, CN <br />Sub-Area <br />1 <br />2 <br />3 <br />4 <br />Sum <br /> <br />Total Runoff <br /> <br /> <br />Description <br />Residential <br />Commercial <br />Open Space <br />Roads <br /> <br /> <br />Percent <br />55% <br />30% <br />10% <br />5% <br />100% <br /> <br />Storm Syr-24hr 10yr-24hr SOyr-24hr 100yr - 24 hr <br />Potential Abstralion. S 1.62 1.82 1.62 1,62 <br />Runoff Depth, Q (inches) 0.43 0.S6 1.17 1.33 <br /> <br />Time of Concentration <br />Overland Flow <br />From Figure 3-1, TR-SS <br /> <br />Basin Ca/culallon <br /> <br />Reach <br />A <br />B <br />C <br />o <br />Total <br /> <br />Peak Dlscharae <br /> <br />Channel Flow <br />T" = U(I.49/n)R2/3 S 112 <br />where: <br />R = Hydraulic Radius n = Roughness Coeff. <br />S = Channel Slope L = Length of Flow <br />Tee = Time of Concentration, Channel Flow <br /> <br />Flow <br />Type <br />oyerland <br />. .channel <br />::Ch"ah1'1el <br /> <br /> <br />V <br />(ftIs) <br />1.2 <br />8.9 <br />18.S <br />9.1 <br />7.9 <br /> <br />Teoor T cc <br />(min) <br />3.3 <br />2.2 <br />0,9 <br />9.4 <br />1S,8 <br /> <br /> <br />Unit Peak Discharge (cfs/sm/inch) <br />Area 8m <br /> <br />8/20/02 <br />TRS5-hydrology,xls <br />