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' PRESSURE DISTRIBUTION SYSTEM END PERFORATION OF A PERFORATED LATERAL <br /> Gross Cover <br /> 1. Select number of perforated laterals 3 F\a/S/ <br /> ;g; <br /> p, Topsoil ,/ <br /> • Layer of Geotextile Fabric (or tour• <br /> r Loamy Sand Layer 'Inch layer of hay or straw covered <br /> 2. Select perforation spacing = 3 feet. • • • with red rosin paper) <br /> tjjjEer{ wi. Perforation Drilled Horizontally <br /> ;y-: - Into C•p Near Top <br /> 3. Since perforations should not be placed closer than 1 ft. to =,;Plus 1...__ <br /> ' —_—AI Least Ir,D Edge <br /> the edge of the rock layer (see diagram), subtract 2 ft. from ' o FINd R•- N .�:•',,{ of Rock Layer <br /> Perforations <br /> the rock layer length. Clean Sand Layer <br /> BottommooffLocated at <br /> Lateral <br /> ft. = `/I( feet. Original Soil Properly Scarified <br /> Rock layer length Before Placing Sand Layer <br /> eqischarge <br /> 4. Determine the number of spaces between perforations. RIn"ired gallons perration minute(gpm) <br /> Divide the length above by perforation spacing and round Di Head 52,.d,P''' d P'.I <br /> down to nearest whole number. (feet) <br /> 1.0a 0.56 0.74 <br /> Length perf. spacing = 'I ft. T 3 ft. _ /6 spaces 2.Ob 0.80 1.04 <br /> (3) (2) a.Use for single family homes <br /> b.Use for all other applications <br /> 5. Number of perforations is equal to one plus the number of <br /> perforation spaces . <br /> Maximum number of quarter inch perforations per <br /> /> spaces + 1 = r? perforations/lateral lateral to guamantee<10%discharge variation <br /> Perforation <br /> 6. Multiply perforations per lateral by number of laterals to S)fee <br /> acing 1% Pi 2 <br /> get total number of perforations. 2.5 14 18 28 <br /> 3 x —�— _ -� perforations. 3.0 13 17 26 <br /> laterals perfs/lateral p 3.3 12 16 25 <br /> 7. Determine required flow rate by multiplying 4.0 11 15 23 <br /> number of perforations by flow per perforation 5.0 10 14 22 <br /> 3-1 ,7t.", . 38,= <br /> gpmQQ e� <br /> perfs x gpm/perf . MANIFOLD LOCATED AT ENO OF PRESSURE DISTRIBUTION SYSTEM <br /> 8. If laterals are connected to header pipe as shown on upper <br /> example, to select minimum required lateral diameter;enter = j" <br /> table with perforation spacing and number of perforations - .,r.�°`° ` <br /> per lateral. Select minimum diameter for ��/`"`M <br /> perforated lateral= I %y inches. <br /> LAYOUT OF PERFORATED PIPE LATERALS FOR <br /> PRESSURE DISTRIBUTION IN UOINID <br /> ct [KOMiS PLASTIC.R <br /> rEl�OrriWe iso,a.' pM <br /> 9. If perforated lateral system is attached to manifold pipe near ofr'"'` I. x K...,,,:,,pe,. .r.• <br /> the center, lower diagram,perforated lateral length and <br /> - Sr- --rorty,;,--- ,...,,,:,,pe,. ,, <br /> number of perforations per lateral will be approximately one - • l, .a..-,z <br /> half of that in step 8. Using these values,select minimum two a, b, <br /> diameter for perforated lateral = I%.--/ inches. ,(ee °`°rte �,. . <br /> ``REM <br />