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' OSTP At-Grade Design Worksheet UNIVERSITY �����r::�- <br /> Minnesota PoUutian OF MINNESOTA <br /> Contro!Agency +t1'°.- <br /> 1. DISPERSAL MEDIA SIZING: Project ID: y��,pg,z2 <br /> A.Design Flow �Design Summary 7A): 750 GPD <br /> B. Soil Loading Race(Desiqn Sum.10�: 0.60 GPD/ft� <br /> C. %Land S(ope�Design Sum.18): 14.0 % <br /> D. Contour Loading Ra[e ��GPD/ft Cannot exceed 12 GPD/ft <br /> (From Design Summary 2E-same as Linear Loading Rate) <br /> E. Absorption Bed Width =Contour Loading Rate (t.D)�Soi(Loading Rate (1.B) <br /> (round up to nearest whole number) Canno[exceed 15 feet <br /> ��GPD/ft�= 0.60 GPD/ft= 8.3 ft <br /> F.Absorption 9ed Length =Design Flow (1.A):Contour Loading Rate (1.D) <br /> 750 GPD : ��GPD/ft= 150 ft <br /> G.Required Absorp[ion Bed Area=Design Flow(t.A)a Soil Loading Ra[e(1.B) <br /> 750 gpd= 0.60 GPD/ft'= 1250 ft' <br /> 2. BERM SIZING: <br /> A. Determine System Height=media height+�2"cover,divide by 12 inches per foot[o convert to feet <br /> �� f� t ( 12 inches =12 inches/ft = 1 2.0 ft <br /> B. De[ermine Upslope Berm Wid[h <br /> 1. Upslope Multiplier based on percent slope(see Table II) 2.62 <br /> 2. On 5(opes>1%Upslope Width =Upslope Multiplier (2.B)X System Height (2.A) <br /> 2.62 X 2.0 ft = 5.2 ft <br /> 3. On Stopes<t%,Upstope Width=(0.5 X Absorption Bed Width(1.E))+5 ft <br /> (0.5 x 8.3 ft)+ 5ft = 9.2 ft <br /> 4. Choose B.2 or B.3 depending on slope 5,Z f� <br /> C. Determine Downslope Berm Width <br /> 1. Downslope Multiplier based on percent slope(see Table II) $,29 <br /> 2. Downlsope Width=Downstope Muttiplier X System Height 8.29 X 2.0 ft = 16.6 ft <br /> 3• Absorption Bed Width+5 feet = 8.3 ft + 5 - 13.3 ft <br /> 4• On slopes>1%,Downslope Berm Wid[h equals greater of C.2 and C.3 = 16.6 ft <br /> 5. On slopes<1%,Downslope Berm Width equats 0.5 X Absorption Bed Wid[h+5 fee[ <br /> ( 0.5 x 8.3 ft + 5 ft = 9,2 ft <br /> 6� Choose C.4 or C.5 depending on slope: 16.6 {t <br /> H.fndslope Muldplier (uwatty 4.0) 4.00 <br /> I. Endslope Width =Ends(ope Multip(ier (2.H)X System Height (2.A) 4.00 X 2.0 ft = 8.0 ft <br /> J. System Width =The sum of the Upslope Width (2.C)+pownslope Width(2.G) (Minimum of 6 feet) <br /> 5.2 ft + 16.6 ft = 21,8 ft <br /> K.System Length=Sum of[he Endslope Width (2.I)+qbsorption Bed Leng[h (t.F)+Endslope Width (2.1) <br /> 8.0 ft + 150.0 ft + 8.0 ft = 166.0 ft <br /> Slt�pe M4tltipief Tdbie-4:1 <br /> Land Slope� 0 1 2 3 4 i 5 7 8 9 4a !1 12 <br /> 41p.lespE katia 4.l70 3.65 3.70 3.b7� 3.�i5 3.33� 3.23 3_t2 3.t83 24i 2_86 2.7ffi T.70 <br /> Dow�lape Ratia �.Lt7 �.i7 i_35 �_54 i_7S �_tK� 5.26 ,.�E � 5_86 5.25 6.87 7.1� 7.d4 <br /> L. If using a registered product,enter the Component Length: ��in a 12 ��ft <br /> M.If using a registered product,enter the Componen[Width: ��in : 12 ��ft <br /> N.Number of Components per Row=Bed Length (t.F)divided by Componen[Length (2.L)(Round up) <br /> � ft> � ft = �-�components/row <br /> �J <br /> 0.Number of Rows=Bed Width (1.E)divided by Component Width (2.M)�Round up) <br /> Adjust Contour Loading Rate on Design Summary page until this number is a whole number <br /> �� ft + �� ft = �� rows <br /> p. Total Number of Components=Number oj Components per Row X Number of Rows <br /> � x C� _ �_�components <br /> lt3 c,� ��,� <br />