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OSTP Mound Design <br /> UNIVERSITY <br /> MinnesotaPollution �yorksheet > 1 % Slope OF MINNESOTA <br /> Control Agency .��. <br /> 1. SYSTEM SIZING: Project ID: v 06.12.13 <br /> a. Design Ftow: 750 GPD TABLE IXa <br /> B. Soil Loading Rate: 0.45 GPD/ftz LOADING RATES FOR DETERMINING BOTTOM ABSORPTION AREA <br /> AND ABSORPTION RATIOS USING PERCOlAT10N TESTS <br /> C. Dept�: to Limiting Condition: 1.2 ft �etmeMLeveIC TreetmeML�w1A,A•2,E, <br /> Percolatlon Rate ��tlO° AAound �� /Npy� <br /> D. Percent Land Slope: 6.0 3� �"�> �`�1oid1ne "f°�O°�"� <br /> Rau ADxxptl°^ Rate MsorPdon <br /> flPd/R') Ratio (��� RKip <br /> E. Design Media Loading Rate: 1.2 GPD/ftZ �o, . <br /> � � <br /> �. Maund Absorption Ratio: 2.60 0,cos �.2 � i 6 � <br /> 0'I fo 5(t�ne und 0.6 2 1 �,g <br /> Tdble I antl�oa hne sarw <br /> MOUND CONTOUR LOADING RATES: s to is o.78 t.s 1 �,e <br /> CO�1t0ur �6 to 30 0.6 2 0.78 2 <br /> Meawred ' Texture•dcrivcd <br /> Perc Rata OR mourld ab5orption ratio Loading 31 co 45 0.5 2.4 0.78 2 <br /> • RdtO: qg to gp 0.45 2.6 0.8 2.8 <br /> =60mp± 1.0, 1.3. 2.0. 2.�i. 2.6 _12 6i�o i2o - 5 0.3 S.3 <br /> . >120 - • - . <br /> 61-i20mpi OR 5.0 c12 <br /> . *Systems with these values are not Type I systems. <br /> : izo ma;• ,5,0� :6. Contour Loading Rate (linear loading rate) is a <br /> recommended value. <br /> 2. DISPERSAL MEDIA SIZING <br /> A. Calcuiate Dispersal Bed Area: Design Flow= Design Media Loading Rate =ftZ <br /> i 75G GPD : 1.2 GPD/ftZ = 625 ft2 <br /> I`� largcr dispersal media area is desired, enter size: 630 ftz <br /> B. Enter Dispersai Bed Widih: 10.0 ft Can not exceed 10 feet <br /> C. Calculate Contour Loading Rate: Bed Width X Design Media Loading Rate <br /> j�ftZ X 1.2 GPD/ftZ = 12.0 gaVft Can not exceed Table 1 <br /> D. Calculate Minimum Dispersal Bed Length: Dispersal Bed Area = Bed Width = Bed Length <br /> i 630 �ft2 : 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. Fcr stcpes >1%, the Absorption Width is measured downhill from the upslope edge of the Bed. <br /> Catculate 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 Votume: Media Depth X Length X Width <br /> 1.00 ft X 63.0 ft X 10.0 ft = 630 ft3 = 27 - 23 yda <br />