Laserfiche WebLink
'.I t <br /> _ OSTP Mound Design <br /> UNIVERSITY <br /> Minnesota Pollution Worksheet >1% Sloepr n ` <br /> Control Agency OF MINNESOTA <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> A. Design Flow: 750 GPD TABLE IXa <br /> B. Soil Loading Rate: 0.45 GPD/ft2 LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> j AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> Treatment:level C Treatment Level A,A-2,B. <br /> C. Depth to Limiting Condition: 1.8 ft <br /> Absorption Percolation Rate Area Loading Mound Area LongMDUnd <br /> D. Percent Land Slope: 3.0 % (MPQ Rate A6sorPtion Rate Absorption <br /> i (Wd,) Ratio (WdW) Ratio <br /> E. Design Media Loading Rate: 1.2 GPD/ft2 <br /> F. Mound Absorption Ratio: 2.60 0.,to 5 1.2 1 1.6 1 <br /> 0.1 to 5(fine sand 0.6 2 1 1.6 <br /> Table I and ba rine sand <br /> i <br /> MOUND CONTOUR LOADING RATES: 6 to 15 0.78 1.5 1 1.6 <br /> Contour 16 to 30 0.6 2 0.78 2 <br /> Measured Texture-derived <br /> Porc Rata OR mound absorption ratio Loading 31 to 45 0.6 2.a 0.78 2 <br /> Rate: 46 to 60 0.46 2.6 0.6 2.6 <br /> S 60mpi 1.0, 1.3.2.0,2.4. 2-6 _12 61 to 120 5 0.3 6.3 <br /> >120 - _ <br /> 61-120 mpi OR 5.0 <_12 <br /> *Systems with these values are not Type I systems. <br /> > 12o mpi' ;s.o• _6. Contour Loading Rate (linear loading rate)is a <br /> recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Calculate Dispersal Bed Area: Design Flow=Design Media Loading Rate=ft2 <br /> I <br /> 750 GPD = 1.2 GPD/ft2 = 625 ft2 <br /> If a larger dispersal media area is desired, enter size: 630 ft2 <br /> B. Enter Dispersal Bed Width: 10.0 ft Can not exceed 10 feet <br /> C. Calculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> 10 ft2 X 1.2 GPD/ft2 = 12.0 gal/ft Can not exceed Table 1 <br /> D. Calculate Minimum Dispersal Bed Length: Dispersal Bed Area : Bed Width = Bed Length <br /> 630 ft2 10.0 ft = 63.0 ft <br /> 3. ABSORPTION AREA SIZING <br /> A. Calculate Absorption Width: Bed Width X Mound Absorption Ratio =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 - Bed Width <br /> 26.0 ft <br /> . DISTRIBUTION MEDIA: ROCK <br /> A. Media Volume: Media Depth X Length X Width <br /> 1.00 ft X 63.0ft X 10.0 ft= 630 ft' = 27 = 23 yds <br />