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1. Select number of perforated laterals `3 <br />2. Select perforation spacing = -S ft. <br />3. Since perforations should not be placed closer than I ft. to <br />the edge of the rock laver (see p. F-14), subtract 2 ft. from the <br />rock laver length. <br />Rock aver:en¢:ri - 2 ft. = Z.S ft. <br />4. Determine the number of spaces bettyeen perforations. <br />Divide the length above by perforation spacing and round <br />down to nearest whole number. <br />Length perf. spacing =-Z-�- ft. + 3 ft. _ spaces <br />(3) (2) <br />5. dumber of perforations is equal to one plus the number of <br />perforation spaces . <br />9- spaces + 1 = 9 perforations/lateral <br />6. Multiply perforations per lateral by number of laterals to <br />get total number of erforations. <br />3 E .-:� <br />latent x perfs/lateral perforations. <br />7. Determine rewired `lzw race by multiplying <br />number of perforations by flow per perforation <br />(see page E -17) <br />a r 4. <br />x <br />Pal arm Pelf <br />8. If laterals are connected to header pipe as shown on page E- <br />15, select minimum required lateral diameter from table on <br />page E-17; enter table with perforation spacing and number <br />of perforations per lateral. Select minimum diameter for <br />perforated lateral = -r - inches. <br />9. If perforated later... s�-stem is attached to manifold pipe near <br />the center, a.: on page E-12, perforated lateral length and <br />num! er of perforations per lateral will be approximately one <br />half of that in step 8. using these V31ues, select minimum <br />diameter for perforated lateral from page E-17 as Z <br />inches. <br />E-17a <br />TABLE OF ERFORATICN DISCHARCE5 <br />[lead <br />Per}eranon diameter finches! <br />7/32 1 14 <br />1.03 <br />0.56 074 <br />1.5 <br />0.69 0.90 <br />2.Ob <br />("So 1 C4 <br />2.3 <br />^. S l 1 17 <br />3.0 <br />0.93 1 _9 <br />4.0 <br />1.13 1.47 <br />_U <br />1.26 1 63 <br />aUse 1.0 fnot of L ead for residential syste.ns <br />bUse 2.0 fret <br />of head for other establishments <br />E-17b <br />Boa o...s...... <br />115 lccn <br />1.5 inch 2.0 to :r•. <br />2.5 <br />14 <br />18 <br />'3 <br />3.0 <br />13 <br />17 <br />26 <br />3.3 <br />12 <br />16 <br />23 <br />4.0 <br />11 <br />is <br />23 <br />5.0 <br />10 <br />14 <br />21 <br />F•15 <br />E-12 <br />r- <br />