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PRESSURE DISTRIBUTION SYSTEM <br /> All boxed iecfangles must 6e entered,the rest will be ca�ulated. <br /> 1. Seled number of perforated laterals: �3 �:�.�«,.s.�..r.,�.�,. <br /> .� .W ........_.....� <br /> --- ��• <br /> 2. Select perforation spacing= �3 ft `�����`��"'M�'�A 3 � <br /> I �...��..k � <br /> i'er(.:pe<�ng x15'_gll4•. <br /> 3. Since pertorations should not be placed closer that 1 foot to <br /> the edge of the rock layer(see diagram),subtract 2 feet from <br /> the rock layer len th <br /> 50 -2ft= 48 ft <br /> 4 Determine the number of spaces between pertorations. <br /> Divide the length(3)by perforation spacing(2)and round down to nearest whole number. <br /> Perforation spacing= 48 ft/ 3 ft= 16 <br /> 5. Number of perforations is equal to one plus the number of perforation spaces(4). <br /> 'Check figurs E�to assure the number of perforations per/atera!guarantees <br /> <10%discharge variation. <br /> 16 spaces+1 = 17 perforations/lateral <br /> E-4 Maximum Number of 1/4 inch perforations E-6 Perforation Discha e in GPM <br /> r lateral to uarantee<10°�dlscha e varlation Head Perforations diameter <br /> Perforation feet inches <br /> Spacing 3/16 7/32 1/4 <br /> feet 1 inch 1.25 inch 1.5 inch 2.0 inch 1° 0.42 0.56 0.74 <br /> 2.5 8 14 18 28 2° 0.59 0.80 1.04 <br /> 3.0 8 7 3 17 26 5 0.94 1.26 1.65 <br /> 3.3 7 12 16 25 e. Uae 1.o foot for single-famiy homes. <br /> 4.0 7 11 15 23 b.Use z.o feet tor anythin else <br /> 5.0 6 10 14 22 <br /> 6. A.Total number of perforations=pertorations per lateral(5)times number of laterals(1). <br /> 17 perfs/lat x 3 laterals= 51 perforations <br /> B.Calculate the square footage per perforation. <br /> Recommended value is 6-10 sqft/pert. Dces not apply to at�rades. <br /> 1. Rock bed area=rock width(ft)x rock length(ft) <br /> 10 ft x 50 ft= 500 ft <br /> 2. Square foot per perforation=Rodc Bed Arealnumber of perts(6) <br /> 500.0 ft� / 51 perfs = 9.8 ft/perf <br /> 7. Detertnine required flow rate by multiplying the total number <br /> of perForations(6A)by flow per perForations see figure E-6) <br /> 51 perfs x 0.74 gpm/perts= 37.7 gpm <br /> 8. If laterals are connected to header pipe as shown -=•'�.i%""� <br /> in Figure E-1,to select minimum required lateral •� �� ��� ' <br /> diameter;enter figure E-d with perforation spacing(2)and � � �-'' ' <br /> number of perforations per lateral(5). !qqur�E-1:MonlbltlLooalW dlndafOrsMn " '�� <br /> Select minimum diameter for perforated laterals= 2.0 inches <br /> 9. If perforated lateral system is attached to manifold pipe �G��,�.v _ _ �,� <br /> near the center,like Figure E-2,perforated lateral length(3) � --_ <br /> and number of perforations per lateral(5)will be approximately _ -' <br /> one half of that in step 8. Using these values,select - . . <br /> minimum diameter for perForated lateral= 1.5 inches. _ `w�-- ,r � <br /> I here certify that I have completed this work in accordance with all applicable ordinances,rules and laws. <br /> (signature) 810 (license#) // ��' (date) <br /> Page 1 of 1 <br />