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4. . MOUND SIZING <br /> A. Calculate Clean Sand Lift: 3 feet minus Depth to Limiting Condition (1.C)=Clean Sand Lift (1 ft minimum) <br /> 3.0 ft - 1.0 ft = 2.0 ft <br /> B. Calculate Upslope Height:Clean Sand Lift (4.A)+media depth (1 ft.)+cover (1 ft.)=Upslope Height <br /> 2.0 ft + 1.0 ft + 1.0 ft= 4.0 ft <br /> C. Select Upslope Berm Multiplier 3.23 (figure D-34) <br /> (based on land slope): <br /> D. Calculate Upslope Berm Width:Multiplier (4.C)X Upslope Mound Height (4.B) =Upslope Berm Width <br /> 3.23 x 4.0 ft = 13.0 ft <br /> E. Calculate Drop in Elevation Under Bed:Bed Width (2.B) X Land Slope (1.D)+ 100=Drop (ft) <br /> 10.0 x 6.0 % + 100= 0.6 ft <br /> F. Calculate Downslope Mound Height: Upslope Height (4.B)+Drop in Elevation (4.E)=Downslope Height <br /> 4.0 ft + 0.6 ft = 4.6 ft <br /> Select Downslope Berm Multiplier <br /> G. (based on land slope): 3.66 (figure D-34) <br /> H. Calculate Downslope Berm Width:Multiplier (4.G)X Downslope Height (4.F) =Downslope Berm Width <br /> 3.66` x 4.6 ft = 20.0 ft <br /> I. Calculate Minimum Berm to Cover Absorption Area:Downslope Absorption Width (3.B or 3.C)+4 ft. =ft <br /> 10.0' ft + 4 ft = 14.0 ft <br /> J. Design Downslope Berm =greater of 4H and 41: 20.0 ft <br /> K. Select Endslope Berm Multiplier: 3.00 (usually 3.0 or 4.0) <br /> L. Calculate Endslope Berm (4.K)X Downslope Mound Height (4.F)=Endslope Berm Width <br /> 3.00 x 4.6 ft = 14.0 ft <br /> M.Calculate Mound Width: Upslope Berm Width(4.D)+Bed Width (2.B)+Downslope Berm Width (4.J)=ft <br /> 13.0` ft + 10.0 ft + 20.0 ft = 43.0 ft <br /> N. Calculate Mound Length:Endslope Berm Width (4.L)+Bed Length (2.C)+Endslope Berm Width (4.L)=ft <br /> 14.0 ft + 50.0 ft + 14.0 ft = 78.0 ft <br /> D-34:Slope Multiplier Table <br /> Land;510pf% 0 1 2 3 4 5 '6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 <br /> UpSlOpe 3:1 3.00 2.91 2.83 2.75 2.68 2.61 2.54 2.48 2.42 2.36 2.31 2.26 2.21 2.17 2.13 2.09 2.06 2.03 2.00. 1.97 1.95 1.93 1.91 1.89 1.87 1.85 <br /> Benn Ratio 4:1 4.00 3.85 3.70 3.57 3.45 3.33 3.23 3.12 3.03 2.94 2.86 2.78 2.70 2.62 2.55 2.48`-2.41 2.35 2.29 '2.23 2.18 2.13 2.08 2.03 1.98 1.93 <br /> Land lSlope% =0 1 2 3 `'4 5 "6 7 '8 9 10 11 t2 13 14 15 "16 17 18 19 20 21 22 23 24 25 <br /> Downstope 3:1 3.00 3.09 3.19 3.30 3.41 3.53 3.66 3.80 3.95 4.11 4.29 4.48 4.69 4.95 5.24 5.55 5.88 6.24 6.63 7.04 7.47 7.93 8.42 8.93 9.46 10.02 <br /> Berm Ratio 4:1 4.00 4.17 4.35 4.54 4.76 5.00 5.76 5.56 5.88 6.25 6:67 7.14 7.69 8.29 8.92 9.57 10.24 10.94 11.67 12.42 13.19 13.99 14.82 15.67 16:54 17.44 <br /> 5. ORGANIC LOADING: (Optional) <br /> A. Organic Loading = Design Flow X Estimated CBOD in mg/L in the effluent X 8.35+ 1,000,000(See Table III) <br /> gpd X mg/L X 8.35+ 1,000,000 = lbs CBOD/day <br /> B. Calculate System Organic Loading: lbs. CBOD (5.A) +Bed Area (2.A) =lbs/day/ft2 <br /> lbs/day + ft-2 = lbs/day/ft2 <br /> Table III (7083.4030) <br /> Treatment CBOD(mg/L) <br /> LevelA 15 <br /> Level B 25 <br /> Level C 125 <br />