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~~, <br />itw~rw unuuwrs ceasusuars, wc. <br /> <br />• <br />• <br />PROJECT: JOB NO: SHEET~OF~ <br />Arequa VLF 1125 <br />FEATURE: 8Y: DATE: <br />High Volume Solution Collection Pipe ALD 1/9/08 <br />DETAILS: CHKD BY: DATE: <br />Tertiary Pipe Size and Spacing DTW 1/26/08 <br />Pipe size and spacing will depend on the slope of the lined surface. There are five distinct areas with <br />varying slopes that are to be considered. <br />• Criteria: <br />1) For tertiary pipes, assume 0% slope as the worst case -closest pipe spacing. This adds conservatism in <br />design to account for varying slopes and material properties. <br />2) Mnixmum tertiary pipe length based on the minimum slope of each separate urea. Steeper <br />slopes give shorter pipe lengths. <br />• Arwlysis: <br />Tertiary pipe spacing = [(h,~,XZ-hm;,,2p'(4K/W))°'s <br />h,,,,,, = 2 feet <br />K = 0.0036 ft/sec <br />W = 6.68x10 cfs/ftz <br />Terary pipe spacing = [(22)*((4.0.0036)/(6.68x10~))]°' = 92.9 feet = 95 feet <br />Maximum tertiary pipe length = [Design Flow (cfs) /Solution Application (cfs/ft2))*[i/pipe spacing (ft)] <br />Section Al: <br />Al avg. slope = 25 <br />n = 0.015 <br />Full flow 4" pipe (at 25%) = 0.8 <br />Factor of safety of 1.5, Q = (0.8/1.5) = 0.53 cfs <br />Max, pipe length = [0.53 cfs/6.68x10-6 cfs/ftZ]"[1/95 feet] = 835 feet <br />Pipe flow rate per foot = 0.53 cfs / 835 ft = 6.35x10 cfs/ft <br />Section A2: <br />A2 avg. slope = 31% <br />n = 0.015 <br />Full flow 4" pipe (ot 11%) = 0.6 <br />Factor of safety of 1.5, Q = (0.6/1.5) = 0.40 cfs <br />Max. pipe length = [0.40 cfs/6.68x10-6 cfs/ft2]'[i/95 feet] = 630 feet <br />Pipe flow rate per foot = 0.40 cfs / 630 ft = 6.35x10" cfs/ft <br />Area Average Sbpe <br />Al 25% <br />A2 11% <br />B 30% <br />C 27% <br />D 25% <br />