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/ <br />'Z/€j:AieK <br />V SA <br />HOUND DESIGN PROCEDURE <br />(For Flows up to 1200 <br />A. Sswsgs Flow Rsto <br />Sot D-7 or 1-3, 4, or 5, <br />9Sttrsd vslus; Flow Rsti <br />E-19 <br />F. Pressure Distribution Systsa <br />1.Selecc nuober of perforated <br />laterals € <br />B. Septic Tank Liquid VoITnBB^^^ <br />Csee C-3 or C-5) fooo gallons <br />2.Select perforation spacing <br />" >5 ft <br />3. <br />C.Soil Characreristics <br />1. Depth to restricting layer <br />such ss seasonally saturated <br />soil, bedrock, coarse soil, <br />etc.; inches <br />2. Depth of percolation teats; <br />/B inches <br />Select perforated lateral <br />length; Note if manifold is <br />at end of rock layer, lateral <br />length is rock layer length <br />less half a perforation <br />spacing. If manifold is in <br />center of rock layer, lateral <br />length is one-half rocklsyer^:^.,,^ <br />length less hslf a pepf^ation X <br />3.Number of percolation test <br />holes; holes <br />4. Ave. percolation rate; <br />€\l mpi <br />S z5. Lsndslope - <br />D. Rock Layer Dimensions <br />1. Multiply gpd by 0.83 to <br />obtain required area <br />rock^e^er; <br />^ 0 <br />spacing. Perforata^lateral^ t \ <br />l.ngth - IJ.S J <br />4, Divide lateral lengtfr^tf^ perfor-^^ . <br />ation spacing to get nu^er oi <br />—* perforations per lateral /f | y <br />ZhS feet f y feet - .ffVVerfs^^^ <br />/ perforation must be^"^ <br />Mul <br />lesffks^ iO <br />3. Length of rock layer^ <br />7 Width ^^sqf^-f^^iL <br />E. Rock Volume <br />1. Multiply ro^k^ea-bjrrock deptl^ <br />to get cubic feet of rock; <br />sq ft X / ft ^SOOZM * <br />2. Divide cu ft by 27 cu ft/cu ^ <br />to get cubic yards; /9, S <br />3. Multiply cubic yards by ^4 <br />get weight 0£ rock in tons <br />//, 3Tcu yds X 1.4 <br />Multiply perforations per <br />lateral by number of laterals <br />to get total number of <br />perforations; <br />J? perfs/lat x ^ lets - ><l] <br />6. iotermine required flow rate <br />by multiplying number of ^ <br />perforations by flow per <br />perforation (see page E-17) <br />erfs x,7ygpm/perf J <br />ict minimum required late^l' ' <br />diameter from table on Page E\17; <br />f(^ <br />enter table with perforation ^-----^ <br />spacing, perforation diameter, <br />and number of perforations per <br />lateral. Select <br />diameter for perfdratsd lateral <br />- inches Ht-J <br />Bsssl Width <br />1. Percolation rate in top 12 <br />inches of soil is . e . 7 wpi <br />2. Select allowable soil load^g <br />rote from table on <br />use o-so <br />page E-16;