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PRESSURE DISTRIBUTION SYSTEM Geotextile fabric <br /> 1. Select number of perforated laterals 3 Quarter in�h,,..:h,��;....e"�_ <br /> - ced <br /> 2. Select perforation spacing= 3.O ft r" . .'01.4 1 <br /> Perf Sizing 3116'-1/4" <br /> 3. Since perforations should not be placed closer than 1 foot to Peri:Spacing 1.5•-s <br /> the edge of the rock layer(see diagram),subtract 2 feet from <br /> the rock layer length. E-4: WAY=dlowabie nadir d 1/4-hch pedora m <br /> 2 ft = S 3 ft per brerd to guamfee<10%discharge vadahon <br /> r <br /> perbraflon <br /> 4. Determine the number of spaces between perforations. spach9 <br /> Divide the length(3)by perforation spacing(2)and round feet 1 inch 1.25 inch 1.5 hich 2.0 inch <br /> down to nearest whole number. <br /> 2.5 8 14 18 28 <br /> Perforation spacing=_C_ft+I ft=�_spaces 3.0 8 13 <br /> 5. Number of perforations is equal to one plus the number of 3'3 7 12 16 25 <br /> perforation spaces(4). Check figure E-4 to assure the number of 4.0 7 11 15 23 <br /> perforations per lateral guarantees<10%discharge variation. 5.0 6 10 14 22. <br /> -- - spaces +1 = l perforations/lateral E-6: Perforation Discharge in gpm <br /> 6. A. Total number of perforations= perforations per lateral (5) perforation diameter <br /> times number of laterals (1) head inches <br /> .) �perfs/lat x _lat= _perforations (feet) 3/16 7/32 114 <br /> 1.00 0.42. 0.56 0.74 <br /> B. Calculate the square footage per perforation. <br /> Should be 6-10 sqft/perf.Does not apply to at grades. 2.Ob 0.59 0.80 1.04 <br /> Rock bed area= rock width (ft)x rock length(ft) 5.0 1 0.941 1.26 1 1.65 <br /> _)o ft x S.f ft= aAL sgft <br /> Use 1.0 foot for single-fonvy homes. <br /> Square foot per perforation=Rock bed area+number of perfs(6) b use 2.0 feet for anything eine. <br /> 660 soft+ 64 erfs= �a soft/perf <br /> MANWOW LOCATED AT END OF ppm 00""DUnW SWTEM <br /> 7. Determine required flow rate by multiplying the total number of <br /> perforations (6A) by flow per perforation(see figure E-6) , <br /> S-Perfs x ,g m/perfs=_tjQ -gpm <br /> 8. If laterals are connected to header pipe as shown on upper <br /> example,to select minimum required lateral diameter;enter <br /> figure E-4 with perforation spacing(2)and number of perforations <br /> per lateral(5) Select minimum diameter for <br /> perforated lateral= a f inches. "'°"• E a.:«„'w *; ;M^ <br /> RaC�M RtlM•/( <br /> 9. If perforated lateral system is attached to manifold pipe near <br /> the center,lower diagram,perforated lateral length(3) and Z.- S0. <br /> number of perforations per lateral(5)will be approximately one <br /> half of that in step 8. Using these values,select minimum _ <br /> diameter for perforated lateral= inches. <br /> naw y. <br /> I hereby certify that 1 ha a completed this work in accordance with applicable ordinances, rules and laws. <br /> VI' (signature) 3 / (license#) 00-14Lla (date) <br />