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OSTP Mound Design 1JNIVERSITY - Minnesota Pollution OF MINNESOTA � `�` Control Agenty Worksheet ��,,: 1. SYSTEM SIZING: A. Design Flow(Design Summary tA): 750 GPD Table I h10UN0 CONTOUR LOADING RATES: B. Soi(Loading Rate (Design Sum.1D): 0.60 GPDlftZ . contour hteazurod UR Texture-derivcd Loading Peic Rate mound abiorption rat'to C. Depth to Limiting Condition: 1.2 ft . Face: D. Percent Land Slope (Design Sum. 16): 2.0 % `eon,p; 7.0. t.3.2.G.2.-1. Z.6 c 72 E. Design Media Loading Rnte: 1.2 GPD/ft2 6t-i20 mpi oR s.o :i2 F. Mound Absorption Ratio: 2.O - t20 mpi' :5.0• -�s• G. Design Contour Loading Rate: 12 GPD/ft 'Systems with these values are not Type I systems. (From Design Summary 2E-same as Linear Loading Rate) Contour Loading Rate is a recommended value. 2. DISPERSAL MEDIA SIZING A. Calculate Required Dispersn(Bed Area:Design F(ow (1.A)=Design Media Loeding Rate (1.E)=ftz if a targer dispersal media 750 GPD: 1.2 GPD/ftZ = 625.0 ftZ area is desired,enter size: 630 ft2 B. Calculate Dispersa!Bed Width:Contour Loading Rnte (1.G)=Design Media Loading Rate (1.E)=Bed Width 12 ft = 1.2 gpd/ftZ = 10.0 C. Calculate Dispersat Bed Length: Dispersal Bed Area (2.A):Bed Width (2.6)=Bed Length 630.0 ft2 : 10.0 ft = 63.0 ft D. Select Dispersal Media: 3. ABSORPTION AREA SIZING Note:Mound setbacks ore measured from the Absorption Area. A. Calculate Absorption Width:Bed Width (2.6)X Mound Absorption Ratio (1.F)=Absorption Width 10.0 ft X 2.00 = 20.0 ft B. For slopes from 0 to 1%, the Absorption Width is measured from the bed equalty in both directions. Calculate Absorption�dth Beyond the Bed:Absorption Width (3.A)-Bed�dth (2.6)-2= Width beyond Bed ( N/A ft - N/A ft) = N/A = N/A ft C. For slopes>1%,the Absorption Width is measured downhill from the upstope edge of the Bed. Calculate Downslope Absorption Width:Absorption�dth (3.A) -Bed Width (2.6)=ft 20.0 ft - 10.0 ft = 10.0 ft Comments: Slope, CLR Choice,Material issues