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A - 4 <br />sg <br />n <br />U <br />B. NORTH COLLECTOR DITCH <br />1. Design North Collector Ditch to contain the flows from the <br />entire refuse disposal area. <br />2. Average Slope - 16 ac @ 2:1 slope 8 14 ac @ level <br />(16ac x 50% + 14ac x 09.) / 30ac = 26.677. <br />3. For CN = 85 8 Precipitation <br />4. For A = 30 ac 8 S = 27% Slope <br />5. For Hyd. length = 1530'; Eq. <br />6. For CN = 85 8 Area = 27.6 ac; <br />7. Equivalent discharge = 20cfs/ <br />8. Actual Dischagre = 24.2 cfs x <br />= 2.4" Runoff = <br />Adj.Factor = 1. <br />Area = 27.6 ac <br />Peak discharge <br />in X 1.1" X 1.1 <br />27.6/30 = 22.26 <br />I.10" <br />10 <br />= 20cfs/ir <br />24.2 cfs <br />cfs <br />4100 = 22.26 cfs <br />• <br />1I1. DITCH DESIGN <br />A. SOUTH COLLECTOR DITCH <br />SEGMENT ! - "V" Shaped Ditch with 2:l sideslopes <br />HYDRAULIC DATA <br />Flow Rate 3.88 cfs <br />Manning Number 0.035 <br />Velocity @ Normal Depth 3.43 fps <br />Slope of Channel 7.14 7. <br />Area of Flow 1.13 sgft <br />Normal Depth of Flow 0.75 ft <br />Total Depth of Channel 1.25 ft <br />SEGMENT 2 - "V Shaped Ditch with 2:1 sideslopes <br /> <br />HYDRAULIC DATA <br />Flow Rate <br />Manning Number <br />Velocity @ Normal Depth <br />Slope of Channel <br />Area of Flow <br />Normal Depth of Flow <br />Total Depth of Channel <br />7.70 cfs <br />0.035 <br />4.73 fps <br />15.4 9. <br />1.63 sgft <br />0.90 ft <br />1.40 ft <br />2/16/89 <br />