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/ <br />/ <br />MOUND DLSiGN PROCEDURE <br />(For Flows up to 1200 gpd) <br />A. <br />Sewage Flow Rate <br />See D-7 or I-3, 4, or 5. or use <br />meterea value; Flow Rate = <br />d o o gpd <br />S. <br />Sentic Tank 7'iquid :'olucte <br />- <br />(see C-3 or C-5)le gallons <br />' <br />C. <br />Soil Characteristics <br />F <br />1. Depth to restricting layer <br />such as seasonally saturated <br />soil, bedrock, coarse soil, <br />etc.; inches <br />` <br />2. Depth of percolation tests; <br />a?inches <br />3. Number of percolation test <br />- <br />holesholes <br />4, Ave, percolation rate; <br />mpi Nscfp /- Y <br />5. Landslope _X <br />Kip ` <br />D. <br />Rock Layer Dinensions' <br />1. Multiply gpd by 0.83 to <br />obtain requ+red area of <br />rock layer; <br />COO gpd x 0.83 - SOD sq f t <br />2. Select width of rci.'r: layer <br />(10 feet or less) _ "feet <br />3. Length of rock layer - Area <br />Width SOo sq f t = /a, f t <br />= So ft <br />E. <br />Rock Volume <br />1. rock area by rock depth <br />to get cubic feet of rock; <br />Soo sq f t x 0. 75 f t- -?75cu f t <br />2. Divide cu ft by 27 cu ft/cu yd <br />to get cubic yards; /j,y <br />3. Multiply cubic ;lards by 1.4 t. <br />get weight f rock in toi.s; <br />' .—?-?cu yds x *• .14 - . ; a.Ytcrs <br />F. Pressure Distribut' <br />1. Se�ect nun:bct r� <br />laterals <br />2. Select perforatiut: <br />3. Select perforates, lateral <br />length; Nola if :ran fold .. <br />at end of 1-06' l.a;er, <br />len£Lil 1!c foci; 1;1ye1• <br />less half a perforation <br />srljA 'a., if manifold i:: i;: <br />center : rock layer, latarai <br />is one-half rock layer <br />length less half a perforation <br />spacing. Perforated lateral <br />length = .�� S ft. <br />4. Divide lateral length by pc. f ur- <br />ation spacing; to fret nuinb�.r r•f <br />perforations ; er lateral <br />?3.S feet : -7 feet = perts <br />Note: last perforation must bu <br />.n end cap, (see page E-14) <br />5. Multiply perforations per <br />lateral by number of lat, <br />to get total number of <br />perfora Lions; <br />�rperfs/lat x b lats <br />6. Determine required flow rate <br />by multiplying; number of <br />perf .ations by flow per v., l,I:wr. <br />perforation (seo page: .*-.-'--'-'I <br />JI— <br />pe.rfs, ,/LyI)m/serf <br />7. 6 ••ect ndninium required li:tural <br />a meter f rum ta?,3 a on Flag,: E--1 7; <br />enter table with perforation <br />spacing, perforation di:::h_t :r, <br />nnct number of portoratiu:,t: jwr <br />lateral. Select minimum <br />diameter for perforated lateral <br />G. Basal Width <br />1. �'crcolatlut: rate :in tub <br />inchct: ot: 1:011 i•: <br />t_i <br />— _._ <br />�ui�ct .::lv•..:;t�l. .. .. <br />rate £rr:., <br />