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MOUND DESIGN WORKSHE;r I' <br />(For Flows up to 1200 gpd) <br />FLOW <br />Estimated Co n gpd <br />or measured x 1.5 = gpd. <br />SEPTIC TANK LIQUID VOLUIN'ES <br />gallons f O�� F / U<� ; r- t Q, . <br />7.4 <br />CIL <br />SOILS (refer to site evaluation) <br />.. Depth to restricting layer = /If inches <br />2. Depth of percolation tests = ! inches <br />3. Percolation rate S• 6 mpi <br />.. Land slope 1V <br />Esdrnued Setrate Flow in Gallons <br />N..ber <br />SoilTcxture <br />C.:_(•i <br />pd �rvw <br />S.por Td <br />Ly�__�+1r+ <br />of <br />Type 1 <br />Type 11 <br />11'1 <br />Be_:Ooml <br />750 <br />1.125 <br />1.00 <br />2 <br />300 <br />225 <br />1 500 <br />3 <br />450 <br />300 <br />3.000 <br />4 <br />600 <br />375 <br />1.52 <br />5 <br />750 <br />450 <br />2.00 <br />6 <br />900 <br />525 <br />2.40 <br />7 <br />1050 <br />600 <br />2.67 <br />8 <br />1200 <br />675 <br />5.00 <br />r ROCK LAYER DIMENSIONS <br />:. Multiply flow rate by 0.83 to obtain required area of rock <br />layer: A x 0.83 = <br />KC C gpd x 0.83 sq. ft./gpd sq. ft. <br />:. Select width of rock layer (10 feet or less) _ �' ft. <br />Length of rock layer = area -�- width = Rock Bed <br />C 6 sq. ft. y i C ft. = sy ft. •i�i�i�� i�ir'"i� i�i�:�. <br />1 ~r iii iii i:i'•i~J�i i�i�i~i� i�. Width 510 ft. <br />.I././././.J•J•I. J.l.I. J. J.J././.. <br />ROCK VOLUME i Length <br />Multiply rock area by rock depth to get cub- = feet of rock; <br />Sv 10 sq. ft. x / ft. = SDO cu. ft. <br />Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />S� ^ cu ft. + 27 cu. yd. <br />Multiply cubic yards by 1.4 to get weight of rock in tons; <br />L cu. yd. x 1.4 ton/cu. yd. = Z C tons. <br />.aDSORPTION WIDTH <br />Percolation rate in top 12 inches of soil is 3 mpi <br />Select allowable soil loading rate from table; <br />t"': f o. 6 O gpd/ft' <br />Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/ft2 by allowable soil loading rate,- <br />1.20 <br />ate;1.20 gpd/fe+ . 60 gpd/ft2 = 2 • O <br />Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />2. U x /D ft= 2,9 ft <br />AbsorpdonKSdthSiunRLble <br />J' nulaSonR+ie <br />per rch <br />:nutn i <br />SoilTcxture <br />C.:_(•i <br />pd �rvw <br />S.por Td <br />Ly�__�+1r+ <br />�+1' <br />po:r <br />D.- <br />Faster than 0.1 <br />750 <br />1.125 <br />1.00 <br />1.000 <br />1.500 <br />1.20 <br />1 500 <br />2250 <br />F nc S.ind- <br />2.000 <br />3.000 <br />ovc9 <br />Set fQ.0-6 <br />(41.5 <br />r ROCK LAYER DIMENSIONS <br />:. Multiply flow rate by 0.83 to obtain required area of rock <br />layer: A x 0.83 = <br />KC C gpd x 0.83 sq. ft./gpd sq. ft. <br />:. Select width of rock layer (10 feet or less) _ �' ft. <br />Length of rock layer = area -�- width = Rock Bed <br />C 6 sq. ft. y i C ft. = sy ft. •i�i�i�� i�ir'"i� i�i�:�. <br />1 ~r iii iii i:i'•i~J�i i�i�i~i� i�. Width 510 ft. <br />.I././././.J•J•I. J.l.I. J. J.J././.. <br />ROCK VOLUME i Length <br />Multiply rock area by rock depth to get cub- = feet of rock; <br />Sv 10 sq. ft. x / ft. = SDO cu. ft. <br />Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />S� ^ cu ft. + 27 cu. yd. <br />Multiply cubic yards by 1.4 to get weight of rock in tons; <br />L cu. yd. x 1.4 ton/cu. yd. = Z C tons. <br />.aDSORPTION WIDTH <br />Percolation rate in top 12 inches of soil is 3 mpi <br />Select allowable soil loading rate from table; <br />t"': f o. 6 O gpd/ft' <br />Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/ft2 by allowable soil loading rate,- <br />1.20 <br />ate;1.20 gpd/fe+ . 60 gpd/ft2 = 2 • O <br />Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />2. U x /D ft= 2,9 ft <br />AbsorpdonKSdthSiunRLble <br />J' nulaSonR+ie <br />per rch <br />:nutn i <br />SoilTcxture <br />C.:_(•i <br />pd �rvw <br />..�.., <br />Faster than 0.1 <br />Coarse Sand <br />1.20 <br />1.00 <br />0.1 to 5 <br />Sand <br />1.20 <br />1.00 <br />0.1 to 5 <br />F nc S.ind- <br />0.60 <br />2.00 <br />6 to 15 <br />3andy Loam <br />0.79 <br />1.52 <br />16 to 30 <br />Loan <br />0.60 <br />2.00 <br />31 to 45 <br />Silt Loam <br />050 <br />2.40 <br />46 to 60 <br />Clay Loam <br />0.45 <br />2.67 <br />61 t0120 <br />Clay <br />0.24 <br />5.00 <br />Slower than 120 <br />Clay <br />--- <br />I - <br />M")ti.i'6 W% - .- d nry or VO1Y R1V Ynd. <br />