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PRESSURE DISTRIBUTION SYSTEM END PERFORATION OF A PERFORATED LATERAL <br /> _-Glair Cover <br /> 1. Select number of perforated laterals %,:� <br /> ,O�• Topsoil ,)�j <br /> ' Layer of Geourttll. Fabric for los <br /> 2. Select perforation spacing = 3 feet. •• Loamy Sand Layer ' Inch layer of hay or straw covered <br /> with red !dein paper) <br /> 166 •liC7111rrnliondis Perforahon Drtll.d Horuonialin <br /> 3. Since perforations should not be placed closer than 1 ft. to ph. .1------,--..� Al Least p12•to Ea,e <br /> the edge of the rock layer (see diagram), subtract 2 ft. from !rain Field Rock .. of Rock Layer <br /> i‘ Perforations Located al <br /> the rock layer length. Clean Sand Layer Bottom of Lateral <br /> — 2 ft. = Y feet. ,Original Sall Properly Scarified <br /> Rock layer length Before Placing Sand Layer <br /> Requued Perforation Discharge <br /> 4. Determine the number of spaces between perforations. in gallons per cornute lgpml <br /> Divide the length above by perforation spacing and round °`H ad` %sl '"M ;.a". <br /> (feet) <br /> down to nearest whole number. <br /> 1.0a 0.56 (57.-74) <br /> Length perf. spacing = -34' ft. _ 3 ft. = / spaces <br /> 2.0b 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 /> / spaces + 1 = / p Maximum number of quarter inch perforations per <br /> erforations/lateral lateral to guamantee< 10%discharge variation <br /> Perforation <br /> 6. Multiply perforations per lateral by number of laterals to Spacing <br /> jg 1% ly 2 <br /> get total number of perforations. 2.5 14 18 28 <br /> _a_ /3 = �i C�perforations. 3.0 13 17 26 <br /> laterals X pens/lateral3.3 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 /> e <br /> 71/ <br /> pens X gpm/pert =.3_0_ <br /> = iNIFOI.D LOCATED AT ENO OF PRQSr.ME DISTRIeu1 SYSTru <br /> Y gpm. Y <br /> 8. If laterals are connected to header pipe as shown on upper , <br /> example, to select minimum required lateral diameter; enter , - l I <br /> table with perforation spacing and number of perforations — s,,,�" `- <br /> per lateral. Select minimum diameter for \^ `"` <br /> perforated lateral = I % / <br /> inches. <br /> tlYWr of eeeeonorco.see LATERALS mit <br /> M(]3.ME Clfre..ur KM re..dro <br /> 0-......r.......a of <br /> 9. If perforated lateral system is attached to manifold pipe near , r`r .r" • . s <br /> Y 1 <br /> the center, lower diagram, perforated lateral length and --- 'r.anpE„..MOO a <br /> Inumber 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 /> e- - <br /> O, <br /> / <br /> J <br /> \ <br />