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3. ABSORPTION AREA SIZING Note:Mound setbacks are measured from the Absorption Area. A.Calculate Absorption Width:Bed Width (2.B)X Mound Absorption Ratio (1.F)=Absorption Width 1Q.0 ft X 2.0 20.0 it B. For slopes-1%,the Absorption Width is measured downhill from the upslope edge of the Bed. Calculate Downslope Absorption Width:Absorption Width (3.A)-Bed Width (2.8)=it 20.0 ft 10.0 ft = 10.0 ft 4. MOUND SIZING A. Calculate Clean Sand Lfft: 3 feet minus Depth to Limiting Condition (1.C)-Clean Sand Lift (1 it minimum) 3.0 it - 1.2 ft = i.8 ft Design Sand Lift(optional): 1.8 B. Calculate Upslope Height:Clean Sand Lift (4.A)+media depth (1 ft.)+cover (1 ft.)-Upslope Height 1.8 ft + 1.0 ft + 1.0 ft- 3.8 ft D•34:Slone 14ukiplier Table Land Slope 0 1 1 12 .1 3 1 4 5 6 7,18 9 t0 I t 12 13 I4 15 16 17 i8 19 to 21 22 23 24 25 l3pSlnp? 3a 3.0 2.9t 2.d3 Z.?9 2x8 2.Sf i.54 2.48 1.43 2.36tZ.31�236 2.21 2.t1 1.}3 i.CY i.tK 2.03 i.00 LS7 LSi t.S3 19i 1.89 1.87 1.8i BC�t7o�i1ii014:114,6013-11S117013.5"11-15. 3.33.3.23 3.11 3.03 1.94 1.$5 2.78 1.70I,b2 2.55 2.4$ i.41 2.39 2.29 2.23 1.13 2.13 1.08 2.03 1.98 i.93 Land Slope% 0 1 Z. 3 4 5 6 7 8 9 t0 1 t 12 13 14 6 16' 17. 18 19 20 21. ML� 2�4(rfi alstope ):1 3.00 3.oil3,.913.3"3.41 3.53 3.66 3.$0 3.95 4.lt 4.29 4.48 4.6Y 4.95 9.24 5.55 S.88 634 6,63 1.04 7.4T 1.93 $Bwtn R,aliO 4:1 a.a 4t7 4.35 4.5d 4.76 5.a3 5.26 S.%5.88 6.25 6.6?7.14 169 839 841953 1014 1094 1161 iid2'I319 13991 C.Select Upslope Berm Multiptler (based on land slope): 3.33 (figure D-34) D. Calculate Upslope Berm Width:Multiplier (4.C)X Upslope Mound Height (4.B)=Upslope Berm Width 3.33 ft X 3.8 ft = 13.0 ft E. Calculate Drop In Elevation Under Bed.Bed Width (2.6) X Land Slope (1.D)+100=Drop (ft) 10.0 ft X 4.0 % + 100- 0.40 ft F. Calculate Downslope Mound Height:Lipslope Height (4.8)+Drop in Elevation (4.E)=Downslope Height 3.$ ft 0.40 1 ft = 4.2 ft Select Downslope Berm Multiplier G. (based on land slope): 4.76 (figure D-34) H.Calculate Downslope Berm Width:Multiplier (4.G)X Downslope Height (4.F)=Downslope Berm Width 4.76 x 4.2 ft = 20.0 ft 1. Calculate Minimum Berm to Cover Absorption Area:Downslope Absorption Width (3.B or 3.C)+4 ft.=ft 10.0 ft + �� ft - 14.0 ft J. Design Downslope Berm =greater of 4H and 41: 20.0 ft K. Select Endslope Berm Multiplier: 3.00 (usually 3.0 or 4.0) L. Calculate Endslope Berm (4.K)X Downslope Mound Height (4.F)=Endslope Berm Width 3.00 ft X 4.2 ft = 13.0 ft M.Calculate Mound Width:Upslope Berm Width(4.D)+Bed Width (2.6)+Downslope Berm Width (4.J)-ft 13.0 ft + 10.0 ft + 20.0 ft = 43.0 ft N.Calculate Mound Length:Endslope Berm Width (4.1-)+Bed Length (2.C)+Endslope Berm Width (4.1-)=ft 13.0 ft 63.0 ft + 13.0 ft 89.0 ft Comments: