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• 3. ABSORPTION AREA SIZING , Note:Mound setbacks are measured from the Absorption Area. A. Calculate Absorption Width:Bed Width (2.6j 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 upslope 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 C(ean Sand Lift: 3 feet minus Depth to Limitrng Condition (1.C)=Clean Sand Lift (1 ft minimum) 3.0 ft - 1.3 ft = 1 J ft Design Sand Lift (optional): �1.7 B. Calcutate Upslope Height:Clean Sond Lift (4.A)+media depth (1 ft.)+cover (1 ft.)=Upslope Height 1.7 ft + 1.0 f[ + 1.0 ft= 3.7 ft :'?��IvprhlU:7pll2f�dbl2 � LandSlope�'� Q i t i a 5 � o ' l 8 9 � �o i1 �1 i3 Ta i5 ib i7 19 �9 ; 20 ti i2 t3 ie � ts i � IJ_ylr�Na .;:I i.C� 2'dl�;.d3 �'S :.6R�i.�1�1.5�'2.d9 2.a: i.75�L:1�?.26�i.21�i.'?�i.'3�iJ�5 2.U6 i0i :.1�: I.i?�1.ii l.yi I.y', I.°Y� 1.8? I.T.+i I ; E�,liil 4.3;'r� �.:1 1�'v;d5�3.,'; 3.57 ;.JS i.3i 3.23 3.iT 3.03 ?�4d 2.85 2J6 2.i0 L52 "t.55?.� 2:d1 :.?5 L29 3.2's 2.18 LI'i :.'J8 i t.Q� t 59 I.y_�� � Ler1d$IOp2`; 0 I � t i 4 5 6 � 7 8 9 i0 11 12 13 id 15 ib 17 18 19 2� 21 21 t3 24 25 � i [ friiG _ ::I ?.U, 'Ci��'i i.�? i.11�i5? i56�3.E0 3.Si J.il',13 J.1S �1.h5�,.i','ita�i.i5lc.g3 6,71 6.F; ..- '.-I' 7.r:. ?.�ti�?.9i�i.1�' � _ ' E�Itln,'._ !:�1.1 �4.t70 �.i7 a.ys a.i.�aJ6 5.�� i.26 i.5b S.B.i 625�5.67 ?.14 1.ti9 8.'t9�3.9Z�?i' lUia 10.9-! 1L5� 1?.�2�ti.l't ?1.99 'a,F.i�1c.E%11E.S. I�.�S; � Select Upslope Berm Multip(ier (based on land slope): 2.83 (figure D-34) D. Calculate Upslope Berm Width:Multiplier (4.C)X Upsfope Mound Height (4.6)=Upslope Berm Width 2.83 ft x 3.7 ft = 11.0 ft E. Calculate Drop tn Elevotion Under Bed:Bed Width (2.6) X Lond S(ope (1.D):100=Drop (ft) 10.0 ft X 2.0 % : 100= 0.20 ft F. Calculate Downslope Mound Height:Ups(ope Height (4.6)+Drop in Elevotion (4.E)=Downslope Height 3.7 tt * 0.20 ft = 3.9 ft Select Downslope Serm Multiplier �' (based on land slope): 4.35 (figure D-34) H. Calculate Downs(ope Berm Width:Mu(tip(ier (4.G)X Downs(ope Height (4.F)=Downslope Berm Width 4.35 x 3.9 ft = 17.0 ft I. Calculate Minimum Berm to Cover A6sorption Areo:Downslope A6sorption Width (3.6 or 3.C)+4 ft. =ft 10.0 ft + � ft = 14.0 ft J. Design Downs(ope Berm =greater of 4H and 41: 17.0 ft K. Select Ends(ope Berm Muftiplier: 3.00 (usually 3.0 or 4.0) L. Calculate Endslope Berm (4.K)X Downslope Mound Height (4.F)=Endslope Serm Width 3.00 ft X 3.9 ft = 11.0 ft M.Calculate Mound Width: Ups(ope Berm Width(4.D)+Bed Width (2.6)+Downslope Berm Width (4.J)=ft 11.0 ft + 10.0 ft + 17.0 ft = 38.0 ft N. Calculate Mound Length:Endslope Berm Width (4.L)+Bed Length (2.C)+Endslope Berm Width (4.L)=ft 11.0 ft + 50.0 ft + 11.0 ft = 72.0 ft Comments: