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OSTP Mound Design <br /> UNIVERSITY <br /> Minnesata Pollution Worksheet > 1 % S[ope OF MINNESOTA - �; <br /> Control Agency ����J <br /> 1. SYSTEM SIZING: <br /> A. Design Flow(Flow& Soi(- 1.A) : 75O GPD Table I <br /> MOUND CONTOUR LOADING RATES: <br /> B. Soi(loading Rate(Flow& Soil-3.C): 0.78 GPD/ft2 �.,4a�ur4� ' Texture-derivad concour <br /> =erC Rate ��R mound absorption ratio Loadin <br /> C. Depth to limiting Condition: 2.2 ft , Ratc:� <br /> D. Percent Land 5(ope: 6.0 � `��m�; i.o, i.3,Z.o,z..�, z.s _�z <br /> E. Design Media Looding Rote: 1.2 GPDift2 5t-t20 mpi oR s.0 <_iz <br /> F. Mound Absorption Ratio(1.E=1.6): 1.54 � 120 mpi' ��.o• 15� <br /> G. Design Contour Looding 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 vatue. <br /> 2. DISPERSAL MEDIA SIZING <br /> A• Calcutate Required Dispersa!Bed Area: Design F(ow (1.A) :Design Medio Looding Rate (1.E) =ftZ <br /> If a targer dispersal media 750 GPD : 1.20 GPD/ftZ = 625.0 ft� <br /> area is desired, enter size: 630 ft2 <br /> B. Calculate Dispersa(Bed Width: Contour Loading Rate (1.G) :Design Media Loading Rate (1.E) =Bed Width <br /> 12.0 ft : 1.2 gpd/ft2 = 10.0 ft <br /> C. Catcutate Dispersa!Bed Length: Dispersat Sed Area (2.A) :Bed Width (2.B) =Bed Length <br /> 630.0 ftZ : 10.0 ft = 63.0 ft <br /> D. Select Dispersa(Media: ❑ROCk <br /> �Other Approved Media �- <br /> 3• ABSORPTION AREA SIZING <br /> Note:Mound settwcks 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 1.5 = 15.4 ft <br /> B. For slopes>1%, the Absorption Width is measured downhilt from the upslope edge of the Bed. <br /> Calculate Downstope Absorption Width: Absorption Width (3.A) - Bed Width (2.B) =ft <br /> 15.4 ft - 10.0 ft = 5.4 ft <br /> Comments: <br /> Slope, CLR Choice, Material issues <br />