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OSTP Mound Design <br /> UNIVERSITY <br /> Minnesota Pollution Worksheet > 1% Slope OF MINNESOTA F' <br /> Control Agency <br /> 1. SYSTEM SIZING: v 11.05.31 <br /> A. Design Flow(Flow a Soil- 1.A) : 450 GPD Table I <br /> MOUND CONTOUR LOADING RATES: <br /> B. Soil Loading Rate(Flow a Soil-3.C): 0.45 GPD/ft2 Measured Texture-derived <br /> Contour <br /> ng <br /> C. Depth to Limiting Condition: 1.5 ft Parc Rate OR mound absorption ratio LRa e: <br /> D. Percent Land Slope: 12.0 % s 60mpi 1.0, 1.3,2.0.2.4,2.6 • :12 <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 61-120 OR 5.0 -12 <br /> • <br /> F. Mound Absorption Ratio(Table IXa): 2.60 •L- 12o mpi' '5.0• • _6* <br /> G. Design Contour Loading Rate: 12.0 GPD/ft 'Systems with these values are not Type I <br /> systems. <br /> (From Table I -same as Linear Loading Rate) Contour Loading Rate is a recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Calculate Required Dispersal Bed Area:Design Flow (1.A):Design Media Loading Rate (1.E)=ft2 <br /> If a larger dispersal media 450 GPD: 1.20 GPD/ft2 = 375 ft2 <br /> area is desired,enter size: ft2 <br /> B. Calculate Dispersal Bed Width: Contour Loading Rate (1.G):Design Media Loading Rate (1.E)=Bed Width <br /> 12.0 ft : 1.2 gpd/ft2 = 10 ft <br /> C. Calculate Dispersal Bed Length: Dispersal Bed Area (2.A) _Bed Width (2.B)=Bed Length <br /> 375 ft2 : 10 ft = 38 ft <br /> D. Select Dispersal Media: 0 Rock <br /> D Other Approved Media <br /> 3. ABSORPTION AREA SIZING <br /> Note:Mound setbacks are measured from the Absorption Area. <br /> A. Calculate Absorption Width:Bed Width (2.B)X Mound Absorption Ratio (1.F)=Absorption Width <br /> 10.0 ft X 2.6 = 26.0 ft <br /> B. For slopes>1%, the Absorption Width is measured downhill from the upslope edge of the Bed. <br /> Calculate Downslope Absorption Width:Absorption Width (3.A)-Bed Width (2.B) =ft <br /> 26.0 ft - 10.0 ft = 16.0 ft <br /> Comments: <br /> Slope, CLR Choice,Material issues <br />