Laserfiche WebLink
MOUND DESIGN WORKSHEET <br />(For Flows up to 12M gpd) <br />A. FLOW <br />Estimated 175L;' go (see pages D-7 or 1-3,4, 5) <br />or measured — gpd x 1.5 = <br />B. SEPTIC TANK LIQUID VOLUMES <br />- !d -. . , -f- gallons (see pages C-3 or C-5) <br />C. SOILS (refer to site evaluation) <br />1. Depth to restricting layer I -ro 7, v inches <br />2. Depth of percolation Bests = IQ-" inches <br />3. Percolation rate mpi <br />4. Land slope S % <br />D. ROCK LAYER DIMENSIONS <br />I. Multiply flow rate by 0.83 to obtain required area of rock <br />layer: Daily Flow x 0.83 = <br />'? sU gpd x 0.83 sq. ft./gpd : fa sq. <br />2. Select width of rock layer (10 feet or less) _ ft. <br />3. Length of rock layer - Area + Width - <br />�, y �) sq. ft. + 1, ft. _ � ft. <br />E. ROCK VOLUME <br />I. Multiply rock area by rock depth to get cubic feet of rock; <br />9% ft. x ft. _ ?1'l cu. ft. <br />2. Divide cu. ft. by V cu. ft./cu. yd. to get cubic yards; <br />I - cu. ft. + 27 = - ­ -, cu. yd. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br />cu. yd. x 1.4 ton/cu. yd. _ 7 � tons. <br />F. ADSORPTION VVID'ITI ! ri <br />1. Percolation rate in top 12 inches of soil is mpi <br />2. Select allowable soil loading rate from table on page E <br />gpd/ft2 <br />3. Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/fO by allowable soil loading rate; <br />1.20gpd/ft3+ ,y.; gpd/ft'- a•+.�1 <br />Check this value on Page E-16. <br />4. Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />x ft = ft <br />EMWrr/ftwWw MOefoerf <br />2 <br />30 <br />us <br />IN <br />3 <br />1X <br />30e <br />210 <br />eae <br />sn <br />us <br />lob <br />an <br />"a <br />• <br />use <br />srs <br />� <br />..:. <br />a�leeO��i�u <br />e>� <br />=1 <br />f <br />�W <br />Rock BW <br />SOIL <br />Asw.p" wilt SWIS 7Mte <br />MNeweeow ►�er <br />eeNAe� <br />fee <br />after <br />:�1+. <br />we�...•i <br />awes,,. <br />e10 i" <br />w <br />u <br />US <br />•R"eerr . <br />in <br />.6 m <br />�, <br />— <br />-- <br />