Laserfiche WebLink
= OSTP Mound Design UNIVERSITY <br /> Minnesota Pollution Worksheet > 1% Slope OF MINNESOTA <br /> Control Agency <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> A. Design Flow: 750 GPD TABLE IXa <br /> 2 LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> B. Soil Loading Rate: 0.60 GPD/ft AND ABSORPTION RATIOS USING PERCOLATION TESTS <br /> C. Depth to Limiting Condition: 1.5 ft Treatment Level c Treatment Level A,A-2,W,' <br /> Absorption <br /> Percolation Rate ]ng Mound Mound <br /> D. Percent Land Slope: 10.0 % 1"�) RateA io Rate Am Loading ' Of o Ratty (Wdife) Ratio <br /> E. Design Media Loading Rate: 1.2 GPD/ftz <br /> � c0.1 - 1 - 1 <br /> F. Mound Absorption Ratio: o.,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 fine sand <br /> MOUND CONTOUR LOADING RATES: <br /> 6 to 15 0.78 1.5 1 1.6 <br /> M.easurod Toxtura-dorivod Contour <br /> 16 to 30 0.6 2 0.78 2 <br /> Perc Rate OR mound absorption ratio <br /> Loading 31 to 45 0.5 2.a o.78 z <br /> i Rate: 46 to 60 0.45 2.6 0.6 2.6 <br /> 60mpi 1.0, 1.3.2.0. 2.4.2.6 :512 61 to 120 - 6 0.3 5.3 <br /> >120 _ <br /> 61-120 mpi OR5.0 .12 <br /> *Systems with these values are not Type I systems. <br /> EE <br /> >5.0' _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 /> 750 GPD 1.2 GPD/ftz = 625 ft2 <br /> i <br /> If a larger dispersal media area is desired, enter size: 630 ftz <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 /> i <br /> 10 ftz X 1.2 GPD/ftz = 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 ftz 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 2.0 = 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 - Bed Width <br /> 20.0 ft - 10.0 ft = 10.0 ft <br /> 4. DISTRIBUTION MEDIA: ROCK <br /> i <br /> A. Media Volume:Media Depth X Length X Width <br /> 1.00 ft X 63.0 ft X 10.0 ft= 630 ft3 : 27 = 23 yd3 <br /> i <br />