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<br />t =length/velocity = 527 ft/[(5.5 ft/sec) (60 sec/min)] = 1.6 min <br />Total flow time = 13.3 + 1.6 = 14.90 min <br />Rainfall intensity: <br />For Region 6 <br />I =(210)/(14.90 + 26) = 5.13 in/hr <br />For Region 7 <br />I =(77)/(14.90 +10) = 3.09 in/hr <br />I average = 4.11 in/hr <br />The discharge for Areas 8 and R-8 using the Rational Formula: <br />Q = (0.50) (4.11 in/hr) (0.80 acre) + (0.95) (4.11 in/hr) (0.18 acre) = 2.35 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 ditch: <br />A=2ft~ <br />P=4.47ft <br />R = 0.447 ft <br />The slope of Ditch D-8 is 0.025% <br />Q = (1.486/n) A R Z" S "' <br />Q = (1.486/0.025) (2ft') (0.447 ft)"' (0.025)"' <br />Q = 10.99 cfs <br />10.99 cfs > 2.35 cfs, Q ditch > Q drainage, trial ditch is adequate <br />10 <br />Summary of Kvaemer Calculations <br />Piceance site Diversion Ditch System <br />Technial Revision Mining and Reclamation Permit <br />