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<br />..
<br />-·--· '
<br />MOUND DESIGN ~· i v.t<.KSHEET
<br />· (For Flows up to 1200 gpd)
<br />,i,.J
<br />A. FLOW . D-7
<br />Estimated l-,<:> o gpd (see pages D-7 or 1-3, 4, 5)
<br />or measured _ -gpd.
<br />B. SEPTIC TANK UQtJID VOLUMES
<br />.) -; o oo gallons (see pages C-3 or C-5)
<br />C. sons (refer to site evaluation)
<br />1. Depth to restricting layer = 3 ::t ' ' -yo " inches
<br />2. Depth of percolation tests = I ?-inches
<br />3. Percolation rate ? . I mpi
<br />4. Land slope 3 %
<br />D. ROCK LA YER DTh1ENSIONS
<br />1. Multiply flow rate by 0.83 to obtain required area of rock
<br />layer: A x 0.83 =
<br />'700 gpd X 0.83 sq. ft./gpd =~sq. ft.-i lD°;>o ~40
<br />2. Select width of rock layer (10 feet or less)= Io ft.
<br />3. Length of rock layer = area + width =
<br />~'-lJ sq. ft.+ 10 ft.= s~ ft.
<br />E. ROCK VOLUME
<br />1. Multiply rock area by rock depth to get cubic feet of rock;
<br />5..!:l.2,_ sq. ft. X .i& ft. = _sJ.::i_ CU. ft.
<br />2. Divide cu. ft. by 27 cu. ft./ cu. yd. to get cubic yards;
<br />...£.2.!:i cu. ft. + 27 = ;:t I cu. yd.
<br />3. Multiply cubic yards by 1.4 to get weight of rock in tons;
<br />lL cu. yd. x 1.4 ton/cu. yd.= 25.... tons.
<br />F. ADSORPTION WIDTH
<br />1. Percolation rate in top 12 inches of soil is ...2.J_ mpi
<br />2. Select allowable soil loading rate from table on page E-16;
<br />,?7 gpd/ft2
<br />3. 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+ , '.2'."7 gpd/ft2 = /. Si?. .
<br />Check this value on page E-:16.
<br />4. Multiply adsorption width ratio by rbck layer width to get
<br />required adsorption width;
<br />)D X /',SJ ft= / S ft
<br />DTIMA'IID KW110r Pl.OWi IN~ 1'!11 DIii' -TYl'I! CtT ll!S10€NC[ •
<br />ero°rfoous I n m tll
<br />I 300 a, ,ec,· 1011 s 4IIO 300 tl9 "' 4 IOO ,.,, 11941 -I 7'IIO 4ll0 -"fi.s. • too 919 Ht
<br />' IO!IO IOO 170 t:i • IIIOO 11!1 --C-3
<br />SEPTIC TANK CAl'ACITll!S, IN GALLONS 1-· .-OA,Mlll'V --·-= ---Dlll'OHL
<br />, .. 1111
<br />IOIU u .. UH
<br />I CIIII 1111 ....
<br />, ... 1111. .... .. ..
<br />Rock Bed
<br />~:>:>:>•>:;-:,:.-:;;:;-:;.:;-:,.";"'•" I ,-,-~.,.,.,.,.,.,.,.,.,.,.,.,. .............................................. dth '10 rt ,.,.,.,.,.,.,.,.,.,.,.,.,.,.,. ~ ,.,11.,.,.,11., ............. ""·"'·"•.,.•J"•,1' I ,.,.,.,-,-~-,.,.,.,.,.,.,.,.,. , ..... ,,.,,.,.,,.,,.J'..,,■•,JA•,1'•,11•.t• ...... ,
<br />Length
<br />E-16
<br />MJAWM1.1..-um011-.---_....,._
<br />, ... -----....,. . ..,.., ....,., ..... ..,., .....
<br />0.1• I .... .... . ... , ...
<br />I • ti '·" .... . .. , t.tl
<br />ti •ti ..... "·" 1.44 .... a, .,., .... 0.,0 .... . .... ..... . ..• 0.11 , ... I.If " ., .. . ... . ... '·" ....
<br />-ax.±::. -tU!U4.W.uz:ut!I~~±£,...~ ,:::t;JJ¢,,.,._.::-,.,_,,;)1,:,,J.~,.Jl.! lilll,li,-,!)'~~l'JJJJWJ,),;.?f"'!l ,.t.i'!i,, ,, __ 5.;.~, ~eJ. --• .';!. .. ,,~,, ~,JY1_~_!._'!'!'._.f!!:_~~Lm ..... 3;,:•~~""l'~
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