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1.'nrvrusirror.11�sn�c5urn . <br /> � . At-Grade � <br /> Minnesota Pvilution Design Worksheet � <br /> Control A enc <br /> 1. DISPERSAL MEDIA SIZING: <br /> A. Design Flow (F(ow&soi( �.a) 450 GPD <br /> B. Soi(Loading Rate (Flow&Soil 3.C) 0.60 GPD/ftz <br /> C. Land 5(ope 15.0 % <br /> D. Contour Loading Rate 6 GPD/ft <br /> (From Tabte I - Same as Linear Loading Rate) <br /> E. Absorption Bed Width = Contour LoQding Rate (1.D) : Soi(Loading Rate (1.6) <br /> (round up to nearest who(e number) <br /> 6 GPD/ftz : 0.60 GPD/ft = 10.0 ft <br /> F. Absorption Bed Length = Design Flow (1.A) : Contour Looding Rate (1.D) <br /> 450 GPD : 6 GPD/ft = 75 ft <br /> G. Required Absorption Bed Area = Design Ftow (1.A) : Soil Loading Rate (1.6) <br /> 450 gpd : 0.60 GPD/ftz = 750 ft2 <br /> 2. BERM SIZING: <br /> A. Determine System Height = media height + 12" cover, divide by 12 inches per foot to convert to feet <br /> 24 inches : 12 inches/ft = 2.0 ft <br /> B. Upslope Mu(itiplier based on percent slope (see Table II) <br /> 2.48 <br /> C. Upslope Width = Upslope Multip(ier (2.B) X System Height (2.A) <br /> 2.48 X 2.0 ft = 5.0 ft <br /> D. Downs(ope Mulitiplier based on percent stope (see Table II) <br /> 9.565 <br /> E. 4 to 1 Downslope Berm Width = Downslope Multip(ier (2.D)X System Height (2.A) <br /> 9.b X 2.0 ft = 19.0 ft <br /> F. Minimum Downs(ope Berm to cover media by 5 ft =Absorption Bed Width (1.E) + 5 ft <br /> 10.0 ft + 5 ft = 15.0 ft <br /> G. Design Downslope Berm: Use the greater of the 4 to 1 berm (2.E) and the Minimum Downslope berm (2.F) <br /> 19.0 ft <br /> H. Endslope Mu(itiplier (usuatly 4.0) <br /> 4.00 <br /> I. Endslope Width = Ends(ope Mu(tip(ier (2.H) X System Height (2.A) <br /> 4.00 X 2.�ft = 8.0 ft <br /> J. System Width =The sum of the Ups(ope Width (2.C) + Downs(ope Width(2.G) _ <br /> �� ft + �9.0 ft = 24.0 ft <br /> K. System Length = Sum of the Ends(ope Width (2.1) +Absorption Bed Length (1.F) + Ends(ope Width (2.1) <br /> C8.0 ft + 75.0 ft + 8.0 ft = 91.0 ft <br />