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RE RE DI'.TRIB I• Y T M <br /> ar __) <br /> 1. Select number of perfo ated laterals 2 tf.34. Aee..14 <br /> 2. Select perforation spacing = 3 ft. <br /> 3. Since perforations shold not be placed closer than 1 ft. to <br /> the edge of the rock la r (see p. F-14), subtract 2 ft. from the <br /> rock layer length. <br /> RcKk lave length - 2 ft. = <br /> ft. <br /> 4. Determine the number f spaces between perforations. <br /> Divide the length abov by perforation spacing and round _ E-17a <br /> down tO nearest whole number. TABLE OF PERFORATION DISCHARGES IN G".' <br /> Head Perforation diameter(inches) <br /> Length perf. spacing = ED ft. s 3 ft. = / 0 spaces 114 <br /> (3) (2) 1.0a 0.56 0.74 <br /> 1.5 0.6 0.90 <br /> 5. Number of perforation'. is equal to one plus the number of 2.0b 0.8u 1.04 <br /> 2.5 039 1.17 <br /> perforation spaces . 3.0 0.93 1.23 <br /> 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> / 0 spaces + 1 = perforations/lateral aUse 1.0 foot of head for residential systems. <br /> bUse 2.0 feet of head for other establishments <br /> 6. Multiply perforations :ser lateral by number of laterals to <br /> get total number of per orations. E-17b <br /> (j7 / Mammas JIwmW reW N pr=se roue a p.korai te <br /> llllFF�� Nnsr<I;41=1: <br /> *Aelge r�nrae <br /> laterals x perfs/late al Perforations. win°. 1.25 inch 1.5 inch I 2.0 inn <br /> 2.5 14 18 ' 28 <br /> 7. Determine required , low rate by multiplying 3.0 13 3.3 12 17 1 26 <br /> number of perforations by flow per perforation 4.0 11 15 23 <br /> (see page E -17) 5.0 10 14 22 <br /> (o(o <br /> n <br /> perkX r/;.•-fir r:;. E-15 <br /> a.........oh Oe a...Ewa 0eh. ne,a•y'•r <br /> 8. If laterals are connecte. to header pipe as shown on page E- <br /> 15, select minimum re. ired lateral diameter from table on <br /> page E-17; enter table 'ith perforation spacing and number _,....--- a'v- <br /> of perforations per late -1. Select minimum diameter for ��' <br /> perforated lateral = inches. <br /> F-12 <br /> .11 <br /> 9. If perforated latera: sy�s em is attached to manifold pipe near �"��' <br /> the center, a.!-, on page :-12, perforated lateral length and "' r ' <br /> number of perforations per lateral will be approximately one "�- <br /> ".QL3 <br /> half of that in step 8. Using these values, select minimum __ . ,,,, <br /> diameter for perforate. lateral from page E-17 as \---.•"- <br /> ...--- <br /> ,,,.-'` -" <br /> inches. <br />