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3. ABSORPTION AREA SIZING <br /> Note:Mound setbacks are measured from the Absorption Area. <br /> A. Calculate Absorption Width:Bed Width (2.B)X Mound Absorption Ratio (1.F)-Absorption Width <br /> 10.0 lit x 2.0 = 20.0 it <br /> B. For slopes>1%,the Absorption Width is measured downhill from the upslope edge of the Bed. <br /> Calculate Downslope Absorption Width:Absorption Width (3.A)-Bed Width (2.6)=ft <br /> 20.0 lit - 10.0 ft 10.0 ft <br /> 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 - 2.0 ft = 1.0 ft Design Sand Lift(optional): -�1.0 <br /> B. Calculate Upslope Height:Clean Sand Lift (4.A)+media depth (1 ft.)+cover (1 ft.)=Upslope Height <br /> 1.0 ft + 1.0 ft + 1.0 ft= 3.0 ft <br /> D•34:Slope Multlplier Table <br /> Land Slope% 0 1 2 3 4 5 6 7 8 9 10 I I 12 13 14 15t35LO209 <br /> 19 20 21 11 23 24 25 <br /> Upslope 3:1 3,00 2.91 2.83 2.75 2.68 2.61 2.54 2.4812.4212.3612-31 2.26 1.21 2.17 2.13 E2499WZ <br /> 1.97 1.95 1.93 1.91 1.89 1.87 1.85 <br /> Berm Ratio 4:14.00 3.85 3.10 3.57 3.45 3.33 3.23 3.12 3.03 2.94 2.86 2.78 2.10 2.62 1.55 2.23 2.18 2.ti 2.08 2.03 1.y8 1.93 <br /> Ladd Slope% 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 I2 23 24 25 <br /> DOvmSlOpe 3:1 3.0C 3.09 3.1913-3013.4113.51 3.66 3-8013-9514,1114114.4814.6914,9515.24 5.55 5.88 6.24 6.63 7.04 7.47 7.93 8.42 8.93 9.46 10.02 <br /> Bem3 Ratio 4:1 4.00 4.17 4.35 4.54 4.76 5.00 5.26 5.%15.016.2516,67 7.1417.6918-2918.12 9.51 10.24110.94111-67112.42 13.19 13.99 114.82 15.61 116.54 117.44 <br /> Select Upslope Berm Multiplier <br /> C. (based on land slope): 1 3.23 (figure D-34) <br /> D. Calculate Upslope Berm Width:Multiplier (4.C)X Upslope Mound Height (4.6)=Upslope Berm Width <br /> 3.23 ft X 3.0 ft = 10.0 ft <br /> E. Calculate Drop in Elevation Under Bed:Bed Width (2.8) X Land Slope (1.D)=100=Drop (ft) <br /> 10.0 ft x 6.0 % f 100= 0.60 ft <br /> F. Calculate Downslope Mound Height:Upslope Height (4.6)+Drop in Elevation (4.E)=Downslope Height <br /> 3.0 ft + 0.60 ft = 3.6 ft <br /> G.Select Downslope Berm Multiplier <br /> (based on land slope): 5.26 (figure D-34) <br /> H.Calculate Downslope Berm Width:Multiplier (4.G)X Downslope Height (4.F)=Downslope Berm Width <br /> 5.26 1 x 3.6 ft = 19.0 ft <br /> 1. Calculate Minimum Berm to Cover Absorption Area:Downslope Absorption Width (3.B or 3.C)+4 ft.=ft <br /> 10.0 ft + ft = 14.0 ft <br /> J. Design Downslope Berm =greater of 4H and 41: 19.0 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 ft x 3.6 ft = 11.0 ft <br /> M.Calculate Mound Width:Upslope Berm Width(4.D)+Bed Width (2.B)+Downslope Berm Width (4.J)=ft <br /> 10.0 1 ft + 10.0 ft + 19.0 ft = 39.0 ft <br /> N. Calculate Mound Length:Endslope Berm Width (4.L)+Bed Length (2.C)+Endslope Berm Width (4.L)-ft <br /> 11.0 ft + 63.0 ft + F 1-1-.0--1 ft = 85.0 ft <br /> Comments: <br />