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OSTP Mound Design UNIVERSITY <br /> Minnesota Pollution � OF MINNESOTA ''�" <br /> ControlAgency Worksheet > 1 / Slope �,�,, <br /> 1. SYSTEM SIZING: Project ID: �06 �2 �3 <br /> a. Design Flow: 750 GPD TABLE IXa <br /> B. Soil Loading Rate: 0.45 GPD/ftZ �OADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> AND ABSORPTION RATI05 USING PERCOLATION TESTS <br /> C. Depth to Limiting Condition: 1.2 ft Treatment Level C Treatment Leve!A,A-2,8, <br /> Percolatlon Rate Absorptlon AbsorDtion <br /> Area Lwding �und Area Loading r'�O� <br /> D. Percent Land Slope: 3.0 % �""P�� RM� AbsorAtion Ra� nn�,Pno� <br /> (B�/ftZ) Ratio {�fti� Ratio <br /> E. Design Media Loading Rate: 1.2 GPD/ftZ _ <br /> `0� � , <br /> F. Mound Absorption Ratio: 2.60 �'�°�' ��2 � �.s , <br /> c.t co 5 R��e sarw o.s z 1 <br /> Table I ana x,am rine sand� 1.6 <br /> MOUND CONTOUR LUApiNG RATES: s ro is o.78 1.5 1 1,6 <br /> Contour �s ro 30 p,6 2 0�$ Z <br /> tdeawrod ' Taxturc-deriv4d <br /> P9f"C RdtP �R �uound absorptior;-nL10 LOdd7RQ 31 to 4�-� 0.5 2.4 OJS 2 <br /> • FdtQ: Ay��gp 0.45 2.6 0.6 2.6 <br /> -60,110� t.li. l.?�. '[.Q2.-l. 2.6 _ti 5�ic�20 - 5 0.3 5.3 <br /> . >12" - - - ' <br /> �1-t20 mpi C;R. S.Q c12 <br /> . '`Systems with these values are not Type I systems. <br /> - izo��,�i• ,5,�.- _F. Contour Loading Rate (linear toading rate)is a <br /> recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A• Calculate Dispersal Bed Area: Design Flow: Design Media Loading Rate=ftZ <br /> 750 GPD = 1.2 GPD/ftz = 625 ftZ <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. Caltulate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> �� ftz X 1.2 GPD/ftZ = 12.0 gaUft Can not exceed Tabfe 7 <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. Calcutate Absorption Width: Bed Width X Mound Absorption Ratio =Absorption Width <br /> 10.0 ft X 2.6 = 26.0 ft <br /> B. For stopes>1%, the Absorption Width is measured downhill from the upstope edge of the Bed. <br /> Calculate Downslope Absorption Width: Absorption Width - Bed Width <br /> 26.0 ft - 10.0 ft = 16.0 ft <br /> 4. DISTRIBUTION MEDIA: ROCK <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 />