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<br />Culvert C-2 <br />Trial configuration -18-in-diameter CSP, which has a rated flow, Q = 5.70 cfs <br />5.70 cfs > 1.58 cfs, Q culvert > Q drainage, trial culvert is adequate <br />Ditch D-6 <br />Trial configuration - V-ditch, 2-ft-deep, 2:1 side slope, unlined, assumed velocity = 3 fps <br />Overland flow time for Area 6 (0.46 acre), which contributes to Ditch D-6, is 16 min <br />The ditch flow time: <br />t =length/velocity = 136 ft/(3 ft/sec X 60 sec/min) = 0.76 min <br />Total flow time = 16 + 0.76 = 16.76 min <br />Rainfall intensity: <br />For Region 6 <br />I =(210)/(16.76+ 26) = 4.91 in/hr <br />For Region 7 <br />I =(77)/(16.76+10) = 2.88 in/hr <br />I average = 3.90 in/hr <br />The discharge for Area D-6 using the Rational Formula: <br />Q = (0.50) (3.90 in/hr) (0.46 acre) = 0.90 cfs <br />The rated discharge for the trial ditch using Manning's Equation: <br />The properties of a 2-ft-deep, 2:1 side slope ditch: <br />A=bh=(2ft)(oft)=8ft~ <br />P=2(2Z+4')05=8.94ft <br />R=A/P=Sft'/8.94ft=0.89ft <br />The slope of Ditch D-1 is 0.007% <br />Q = (1.486/n) A R ~" S "Z <br />Q = (1.486/0.025) 8 ft' (0.89 ft)"' (0.007)"2 <br />1.19 cfs <br />.19 fs > 0.90 cfs, Q ditch > Q drainage, trial ditch is adequate <br />-~~.gr <br />Culvert C-3 <br />~(~ <br />f <br /> <br />~~~Eo <br />~~ ~ <br /> <br />~~(a~~. <br /> <br />f~,~~~/' <br />Trial configuration -18-in-diameter CSP, which has a rated flow, Q = 5.70 cfs <br />5.70 cfs > 0.90 cfs, Q culvert > Q drainage, trial culvert is adequate <br />Summary of Kvaemer Calailadore ~~ <br />Piteance Site Diversion Ditch System <br />Teclutial Revision Mining and Reclamation Pemtit <br />~~i~ ~ <br />Q ~' <br />