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OSTP At-Grade Design Worksheet UNIVERSITY �,, <br /> Mjnnesata Pallutivn UF MINNESOTA ~.�_��.,- <br /> Corttrol A enc -� <br /> 1. DISPERSAL MEDIA SIZING: Project ID: v 12.08.06 <br /> A. Design Ftow: 75�GPD C. 9�Land Slope: 1.0 % <br /> B. Soil Looding Rate: �50 GPD/ftZ D. Contour Loading Rare: ��GPDlft <br /> E. Absorption Bed Width = Contour Loading Rate (1.D) : Soil Loading Rate (1.B) Cannot exceed 15 feet <br /> 6 GPD/ft2: 0.50 GPD/ft = 12.0 ft <br /> F. Absorption Bed Length = Design F(ow {1.A1 = Contour Loading Rate (1.D) <br /> 750 GPD : 6 GPD/ft = 125 �ft <br /> G. Required Absorption Bed Area = Design Ftow (1.A} = Soil Laading Rate(1.B) <br /> 750 gpd = 0.50 GPDlftZ = 1500 ftZ <br /> 2. BERM SIZING: <br /> A. Determine System Height = media height+ 12" cover, divide by 12 inthes per foot to convert to feet <br /> � 1 ft + ( 12 �in : 12 in/ft ) = 2.O�ft <br /> Stapel�Iti�er TaD#e�#:1 <br /> i.and Slope� t� 1 � 3 i 5 b 1 B 9 f4 1i 9� <br /> Up:l�kd� i�.� 3.8� 1.7G 3.5? a.�; 3.33 3.:.3 d.3` I.v+ :.9� �.8t� ..78 �.70 <br /> D�rmlopeR,��ia �.00 �."`r �.3� �.'� �.re 4.�� �,2b 5.� ;.8� b.?5 �s.67 i.t! 7,�� <br /> B. Determine Upslope Berm Width <br /> 1. Upslape Mu(tiplier based on percent slope (see Slope Muttipler Table) 3.8� <br /> Z. On 5/apes >?%Ups(ope Width = llpsfope Multip(ier (2.6)X System Herght (2.A) <br /> 3.85 X 2.0 ft = 7.7 ft <br /> 3. On Slopes <1%, Upslope Width= (0.5 X Absorption Bed Width (1.E)) +5 ft <br /> (0.5 X 12.0 ft ) + 5ft = 11.0 ft <br /> 4. Choose 6.2 or B.3 depending on slope � 7.7 ft <br /> C. Determine Downslope Berm Width <br /> 1. powns(ope Muttiplier based on percent stope (see Tabte): 4.17 � <br /> 2• Downtsope Width = Downslope Muttiplier X System Height <br /> 4.17 X 2.0 ft = 8.3 ft <br /> 3• Absorption Bed Width + 5 feet = <br /> 12.0 ft + 5 = 17.0 �ft <br /> �., <br /> ^� <br /> , <br /> f ' � <br />