Laserfiche WebLink
OSTP Mound Design <br /> UNIVERSITY . <br /> Minnesota Pollution Worksheet > 1% Slope OFe OF MINNE • <br /> SControl Agency <br /> 1. SYSTEM SIZING: v 11.05.31 <br /> A. Design Flow(Flow& Soil- 1.A) : 750 GPD Table I <br /> MOUND CONTOUR LOADING RATES: <br /> B. Soil Loading Rate(Flow& Soil-3.C): 0.60 GPD/ft2 measuredToxture-derived <br /> contour <br /> Parc Rate OR mound absorption ratio Loading <br /> C. Depth to Limiting Condition: 2.0 ft Rata: <br /> D. Percent Land Slope: 10.0 % =60mpi 1.0. 1.3.2.0.2.4.2.6 • _12 <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 61.120 mpi OR 5.0 112 <br /> F. Mound Absorption Ratio(Table IXa): 2.00 : 120 mpi' .5.0' • t6' <br /> G. Design Contour Loading Rate: 12.0 GPD/ft <br /> *Systems with these values are not Type I 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 750 GPD÷, 1.20 GPD/ft2 = 625 ft2 <br /> area is desired,enter size: 630 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 /> 630 ft2 + 10 ft = 63 ft <br /> D. Select Dispersal Media: L,Rock <br /> 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 2.0 = 20.0 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 /> 20.0 ft - 10.0 ft = 10.0 ft <br /> Comments: <br /> Slope, CLR Choice,Material issues <br />