Laserfiche WebLink
MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated gpd (see pages D-7 or 1-3,4,5) <br />or measured__— gpd. <br />B. SEPTIC TANK UQUID VOLUMES <br />a-/ooo gallons (seepages C-3or C-5) <br />1 *^5*0 ^ )>»ooo <br />C. SOILS (refer to site evaluation) <br />1 mmmm ________ 1 <br />ssss,■iiiiiii •■ <br />m <br />m <br />tw <br />m <br />i±. <br />2. Depdi of percolation tests <br />3. Pftroolationrate_£iIL <br />4. Land slope 3. <br />aa'Vo a u"' indies <br />R ) 1 inches • •IWM m ««M <br />mpi <br />mm <br />• «« NN «M <br />• «t «M» HM <br />MM MW <br />D. ROCK LAYER DIMENSIONS <br />1. Multiply flow rate by 0.83 to obtain required area of rode <br />layer Ax 0.83* <br />gpdx0J3sQ.ft./gDd»jfa^sq.ft.-»>o*>o * <br />2. Select width of rock layer (10 feet or less) • lo ft. <br />3. Length of rock layer o area ♦width* • <br />sq. ft. ♦ 1 o ft. ■ ft. _____Rock Bed <br />E. ROCKVOLUME <br />1. Multiply rode area by rock depth to get cubic feet of rock; <br />CMH sq. ft. X ;.o^ ft. * cu. ft. <br />L Divide ca ft. by 27 cu. ft. /cu. yd. to get cubic yards; <br />cu.ft. ♦27«.ia-cu.yd. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br />ao cu. yd. X 1.4ton/cu. yd. ■ 30 tons. <br />stoa <br />F. ADSORPTION WIDTH <br />1. Percolation rate in top 12 inches of soil is .£J_mpi <br />2. Select allowable soil loading rate from table on page E-16; <br />gpd/ft2 <br />3. Calculate adsorption width ratio by dividing rode layer <br />loading rate of 1.20 gpd/ft2 by allowable soU loading rate; <br />1.20gpd/ft2^jJla«gpd/ft2- _. <br />Qutk tftts value on fnge E-16. <br />4. Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />/o x <br />E-16 <br />MMMM <br />MM MMM <br />V‘A«• <br />Hi.% <br />it b: £SJm «M•M KM (M•M U«Mt M» <br />•wtm•M <br />U*M>