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' 3: ABSORPTION AREA SIZING Note:Mound setbacks are meosured from the Absorption Area. A. Calculate Absorption Width:Bed Width (2.B)X Mound Absorption Ratio (1.F)=Absorption Width 10.0 ft X 2.0 = 20.0 ft B. For slopes>1%, the Absorption Width is measured downhill from the upstope edge of the Bed. Calculate Downslope Absorption Width:Absorption Width (3.A)-Bed Width (2.6)=ft 20.0 ft - 10.0 ft = 10.0 ft 4• MOUND SIZING A. Calculate Cleon Sand Lift: 3 feet minus Depth to Limiting Condition (1.C)=C(ean Sand Lift (1 ft minimum) 3.0 ft - 1.7 ft = 1,3 ft Design Sand Lift(optional): ��1.3 B. Calculate Ups(ope Height:Clean Sand Lift (4.A)+media depth (1 ft.)+cover (1 ft.)=Ups(ope Height 1.3 ft + 1.0 ft + 1.0 ft= 3.3 ft [��3d�.iir,ce:!uiSi6lier Iabl� Land Siope': 0 1 t 3 d 5 ' 6 7 8 9 Ip f I it' I;i Id 15 (b 17 1$ 19 20 21 i2 23 24 25 � � Up5(4p? I::t 3.p� ?.4ti2.83�i-?` i.�iE i.�112.5=�2.� t.�t: 2.i612.31�?.2��2.21i2.'?�L'3j:A4 2.� Lkli�i.l"�7 I.Yl I.ii l.y's 1.y: j LE4 i.9? I.�i ' R�rrn Ra;o i�:� a.� 3.d5 3JQ 3,57 i.d5 3.3i :.23 3.12 J.0? 2,va t.ES 1.78 2.70�.b� t.55 L� 2..1 1.35 L29 ?.23 2.i8 2.t3 2.08 2.63 i58 i.93� LandSiOpe�o Q i ' 2 3 a 5 4 1 8 9 11� il I2 li I� I5 I6 i7 Ifi I9 2� ti 11 t3 24 15 � ��O��IISIG� i3:1 ?.�: ?.Gi 1.'7�'..i0 :.a1�;.51 i.65�3.EC 3.Si �1.11 .1.29 ;.J3 ..55 :.45�5�'[�!�).i5 5.6? 5.?-! �.6i 7.Qd ?,.I; ?."vy d.a'1 9.9i �.� 10.02 ; 6�I�fitRd:�r, la:i 3.a; 4.'1 :.;5 :.SS d.76 5.00 5."t6 5.5h 5.68 6,25 6.61 7.IJ 7.b9 8.29 8.92 9.57 Il�.2J 1U.9a 11.h7 12�T t3.19 13.94 1�{.82 l5.61 16.5� i'.J�i � Select Ups(ope Berm Multiplier (based on land slope): 2.94 (figure D-34) D. Calculate Ups(ope Berm Width:Multiplier (4:C)X Upslope Mound Height (4.6)=Ups(ope Berm Width 2.94 ft x 3.3 ft = 10.0 ft E. Calculate Drop in Elevation Under Bed:Bed Width (2.6) X Land Slope (1.D):100=Drop (ft) 10.0 ft X 8.0 % : 100= 0.80 ft F. Calculate Downslope Mound Height:Upslope Height (4.6)+Drop in E(evation (4.E)=Downslope Height 3.3 ft + 0.80 ft = 4.1 ft Select Downslope Berm Multiplier �' (based on land slope): 4.88 (figure D-34) H. Calculate Downslope Berm Width:Multiplier (4.G)X Downslope Height (4_F)=Downs[ope Berm Width 4.88 x 4.1 ft = 20.0 ft I. 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 Ends(ope Berm Multip/ier: 3.00 (usuatly 3.0 or 4.0) L. Calculate Ends(ope Berm (4.K)X Downs(ope Mound Height (4.F)=Endstope Berm Width 3.00 ft x 4.1 ft = 12.0 ft M.Calculdte Mound Width: Upstope Berm Width(4.D)+Bed Width (2.6)+Downsfope Berm Width (4.J)=ft 10.0 ft + 10.0 ft + 20.0 ft = 40.0 ft N. Calculate Mound length:Ends(ope Berm Width (4.L)+Bed Length (2.C)+Endslope Berm Width (4.L)=ft 12.0 ft + 63.0 ft + 12.0 ft = 87.0 tt Comments: