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Ta'W r'r / Fr.o <br />y d'ev" n f <br />BOUND DESIGN PROCEDURE <br />(For Flows up to 1200 gpd) <br />A. Sewage Flow Rate <br />See D-7 or I-3, 4, or 5, or use <br />metered value; Flow Rate = <br />IC0 6p gpd <br />B. Septic Tank Liquid Volume <br />(see C-3 or C-5) /pOO gallons <br />C. Soil Characteristics <br />1. Depth to restricting layer <br />such as seasonally saturated <br />soil, bedrock, coarse soil, <br />etc.; -7C inches <br />2. Depth of percolation tests; <br />__inches <br />3. Number of percolation test <br />holes; 6 holes <br />4. Ave. percolation rate; <br />/7. mpi <br />5. Landsiope - <br />D. Rock Layer Dimensions- <br />1. Multiply gpd by 0.83 to <br />obtain required area of <br />rock layer; <br />1(00 gpd x 0.83 - JeV sq f c <br />Select width of rock layer <br />(10 fiat or lest-'• _ /-feet <br />3. ength of rock .Byer - Area <br />- Width Sou sq f t = /o f t <br />= So ft <br />Rock Volume <br />1. Multiply rock area by rock del:th <br />t )ic feet of rock; <br />x 0.7y f t= ?75cu f t <br />2. Divide cu ft by 27 cu ft/c., yd <br />co get cubic yards; /3,S <br />3. Multiply cubic yards by 1.4 to <br />pr weight of rock in tons; <br />i},3 yds x 1.4 a 1R4/tons <br />E-19 <br />F. Pressure Distribution System <br />1. Select nu-iLer of perforated <br />laterals 6 <br />2. Select perforation spacing <br />3 ft <br />3. Select perforated lateral <br />length; Note if mania*old is <br />at end of rock layer, lz..eral <br />length is rock layer length <br />les! f a ,perforation <br />spac :f ::u.nifold is in <br />Cc- to)of rock layer, lateral <br />length is one-half rock layer <br />length less half a perforation <br />spaying. Perforated latera). <br />length = Z , 5 ft. <br />4. Divide lateral length '.;;• pc::for- <br />a tion spacing to r numbr r of <br />perforations per lateral <br />73.5 feet ' 7 feet = 8 perfs <br />Note: la::, , _rforatior must be <br />in end cap, (see page E-14) <br />5. Mul perforations per <br />lai(: y number of 1-terals <br />to Fed total number ui <br />perforations; <br />F_perfs/lat x 6 lats <br />6. Determine ruquircd flow gate <br />by multiplying number <br />perforations 1,v _low <br />perforation (see -)age 7) <br />_,perf s x ,7gpm/pert <br />7. Select minimum required lateral <br />diameter from tabl, or. Pate is-17; <br />-cr Lable v- ti. peroration <br />spacing, perft: . -_ion diameter, <br />and number of perforations per <br />lateral. S''.ct minimum <br />diameter for perforated lateral <br />inches 'f rc / % •• <br />Basal Width <br />— Percolation rate in tor, 12 <br />inches of soil is f 1. /mt,i <br />2 :.elect allowable soil leading <br />tote from table o- page E-16; <br />gpd _ 2 <br />