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<br />Hydraulic radius, D = A/P = 4.65 ft=/6.25 ft = 0.746 ft <br />The slope of Culvert C-1 is 0.015% <br />Q = (1.486/n) A R "' S "' <br />Q = (1.486/0.026) (4.66 ft') (0.746 ft) ~" (0.015) "Z <br />Q = 27 cfs <br />27 cfs > 13.69 cfs, Q culvert > Q drainage, trial culvert is adequate <br />Ditch D-5 <br />Trial configuration - V-ditch, l-ft-deep, 2:1 side slope, unlined, assumed velocity =4 fps <br />Overland flow time for Areas 5 (0.42 acre) and R-5 (0.14 acre), which contribute to ditch <br />D-5, is 10.50 min. <br />The ditch flow time: <br />t =length/velocity = 233 ft/(5 ft/sec X 60 sec/min) = 0.97 min <br />Total flow time = 10.50 + 0.97 = 11.47 min <br />Rainfall intensity: <br />For Region 6 <br />I =(210)/(11.47+ 26) = 5.25 in/hr <br />For Region 7 <br />I =(77)/(11.47+10) = 3.21 in/hr <br />I average = 4.60 in/hr <br />The discharge for Areas 5 and R-5 using the Rational Formula: <br />Q = (0.50) (4.60 in/hr) (0.42 acre) + (0.95) (4.60 in/hr) (0.14 acre) = 1.58 cfs <br />The rated discharge for the trial ditch using Manning's Equation: <br />The properties of a 1-ft-deep, 2:1 side slope V-ditch: <br />A=2ft' <br />P=4.47ft <br />R = 0.447 ft <br />The slope of Ditch D-5 is 0.0118% <br />Q = (1.486/n) A R Z" S "~ <br />Q = (1.486/0.025) 2ft2 (0.447 ft)"' (0.0118)": <br />Q = 5.7 cfs <br />5.7 cfs > 1.58 cfs, Q ditch > Q drainage, trial ditch is adequate <br />Summary of Kvaemer Calnilations <br />Piceance Site Diversion IXtch System <br />Technical Revision Muting and Reclamation Permit <br />