Laserfiche WebLink
MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated -M gpd (see pages D-7 or I-3, 4, 5) <br />or measured gpd. <br />B. SEPTIC TAINK LIQUID VOLUMES <br />Z Zd' _ gallons (see pages C-3 or C-5) <br />C. SOILS (refer to site evaluation) <br />1. Depth to restricting layer = ZZ inches <br />2. Depth of percolation tests = / 2- inches <br />3. Percolation rate 2 3 mpi <br />4. Land sloop <br />D. ROCK LAYER DL%TE.tiSIONS <br />I. Multiply flow rate by 0.83 to obtain required area of rock <br />layer: A x 0.83 = <br />7W 20 gpd x O.83 sq. ft./gpd = 2Z sq. ft. <br />2. Select width of rock layer (10 feet or less) _ In ft. <br />3. Length of rock layer = area + width = <br />�� sq. ft. + lU ft. = 6_ ft. <br />E ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />62,Zsq.ft.x' / ft. _(.ZZ cu. ft. <br />2. Divide cu. ft. by 27 cu. ft /cu. yd to get cubic yards; <br />(;?z cu. it. -# 27 = 23 cu. yd. <br />3. Multiply cubic vards by 1.4 to get wei ht of rock in tons; <br />? - c. -u. yd. x 1.4 ton,'cu. yd _A tons. <br />F <br />ADSORPTION WIDTH <br />Percolation rate in top 12 inches of soil is 2-9 mpi <br />2 Select allowab:c soi. loading rate from table on page E-16; <br />Vy- gpd / f t2 <br />I Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br />1 20 gpd/ft2 + (P0 gpd/ft2 = 400 <br />Check this valtje on pine E-16. <br />4. Multiply adsorption width ratio by rack layer width to get <br />required adsorption width; <br />/O x I ft=eft <br />D-7 <br />1 <br />M• <br />Iw) fy . <br />• <br />r <br />1•f Yl �� <br />I <br />I, M <br />I <br />• r • M <br />IM Ir <br />. M <br />IN <br />fw <br />�•. <br />.I I„ <br />. <br />IM ••1 <br />•I. •w <br />Y <br />•r � <br />•. <br />•r <br />C-3 <br />unt f&W Cu►C'nff, r. 6y�prf <br />Iw c.-• <br />iY.O.. a-YYN. <br />.... <br />.... .... <br />Rock Bed <br />.3.3f3 ♦j 3ti dth SIP' <br />F.FP % 5-M <br />i Length• - 4 <br />E-16 <br />r/•.Y• �. Yom• I ra•..wwr• <br />�• • <br />•. a <br />•w <br />•w <br />I, M <br />I <br />• r • M <br />IM Ir <br />. M <br />IN <br />fw <br />�•. <br />.I I„ <br />. <br />IM ••1 <br />•I. •w <br />Y <br />•r � <br />•. <br />•r <br />