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OSTP Mound Design UNIVERSITY Minnesota Pollution Worksheet OF MINNESOTA Control Agency 1. SYSTEM SIZING: A. Design Flow(Design Summary 1A): 600 GPD Table I MOUND CONTOUR LOADING RATES: B. Soil Loading Rate (Design Sum.2D): 0.60 GPD/ft2 Contour measured • Texture-derived tGzdin; C. Depth to Limiting Condition: 2.2 ft Porc Rate OR mound absorption ratio Rato: D. Percent Land Slope (Design Sum. 28): 4.0 % .50rnp- 1.0, 1.3.2.0.2.4,2.6 - -r2 E. Design Media Loading Rate: 1.2 GPD/ft2 61-120 OR 5.0 _12 F. Mound Absorption Ratio: 2.0 z 120 nip, 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 Dispersal Bed Area: Design Flow (1.A)_Design Media Loading Rate (1.E)=ft2 If a larger dispersal media 600 GPD_ 1.2 GPD/ft2 = 500.0 ft2 area is desired,enter size: ft2 B. Calculate Dispersal Bed Width: Contour Loading Rate (1.G):Design Media Loading Rate (1.E)=Bed Width 12 ft _ 1.2 gpd/ft2 = 10.0 C. Calculate Dispersal Bed Length: Dispersal Bed Area (2.A)_Bed Width (2.B)=Bed Length 500.0 ft2 : 10.0 ft = 50.0 ft D. Select Dispersal Media: 3. ABSORPTION AREA SIZING Note:Mound setbacks are measured from the Absorption Area. A. Calculate Absorption Width:Bed Width (2.B)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 equally in both directions. Calculate Absorption Width Beyond the Bed:Absorption Width (3.A) -Bed Width (2.B)=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 upslope edge of the Bed. Calculate Downslope Absorption Width:Absorption Width (3.A) - Bed Width (2.B)=ft 20.0 ft - 10.0 ft = 10.0 ft Comments: Slope, CLR Choice, Material issues