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PRESSURE DISTRIBUTION SYSTEM Geotextile fabric <br /> 1. Select number of perforated laterals <br /> Quarter inch perforations spaced @T 41 <br /> 7 <br /> f <br /> roc n <br /> 2. Select perforation spacing feet. to) <br /> .9 <br /> Perf Sizing 7/32"-1/4" <br /> 3. Since perforations should not be placed closer than 1 ft. to Perf Spacing 15-5' <br /> the edge of the rock layer (see diagram),subtract 2 ft. from <br /> the rock layer length. Perforation Discharges in gpm <br /> - 2ft. = Go feet. perforation diameter <br /> KtXk layer lengffi head inches <br /> (feet) 1/8* 13/16 7/32 1 114 <br /> 4. Determine the number of spaces between perforations. 1.oa 0.18 0.42 0.56 0.74 <br /> Divide the length above by perforation spacing and round 2.06 0.26 0.59 0.80 1.04 <br /> down to nearest whole number. <br /> .5.0 0.41 . 0.94 1.26 1.65 <br /> Length perf. spacing = w"0 ft. ft. = 12- spaces 0 Use 1.0 foot for single-forrAy homes. <br /> (3) (2) b Use 2.0 feet for onythkV else. <br /> Potential for pkigging <br /> 5. Number of perforations is equal to one plus the number of 2 <br /> perforation spaces <br /> Maximum number of quarter inch perforations per <br /> 2 spaces+ I =Z3 perforations/lateral lateral to guamantee<10%discharge variation <br /> Perforation <br /> spacing 6. Multiply perforations per lateral by number of laterals to (feet) 1.k, 1 z 2 <br /> get total number of perforations. 2.5 14 18 28 <br /> A 2C perforations. 0 3.0 13 17 26 <br /> -rateW- X 3.3 12 16 25 <br /> Calculate the square footage per perforation (6-10 sqft/pero 4.0 11 15 23 <br /> System area:-x-= 5.0 10 14 22 <br /> P C <br /> sqf t/perf <br /> .Uea rT0_r 5-FO-1 <br /> "FOLD LOCATED AT END or rncSSkJrtE OISTRIOW" SYSTEM <br /> 7. Determine required flow rate by multiplying <br /> number of perforations by flow per perforation Z.. <br /> 216 j, <br /> X r-T 9P M <br /> t <br /> errs apm pert <br /> 8. If laterals are connected to header pipe as shown on upper <br /> example, to select minimum required lateral diameter; enter <br /> table with perforation spacing and number of perforations LAaT Of KIWOUTED"t LATC-LS MR <br /> per lateral. Select minimum diameter for <br /> perforated lateral = 92 inches. <br /> 9. If perforated lateral system is attached to manifold pipe near <br /> the center, lower diagram, perforated lateral length and <br /> Z ILI= <br /> number of perforations per lateral will be approximately one <br /> half of that in step 8. Using these values, select minimum <br /> diameter for perforated lateral inches. <br />