Laserfiche WebLink
PRESSURE DISTRIBUTION SYSTEM <br /> AI!boxed rectangles must be entered,the rest will be cafculated. <br /> 1. Select number of perforated laterals: 03 ��•.�,..���.•�.,^^. <br /> ........... _- --_......W.........-.... <br /> ..._ <br /> �-z:::.�:.:,M;�;..�:::___.._.---_ _._...__._ .,_ I <br /> ���.�rwRl A T <br /> 2. Select perforation spacing= Oft I �-,,..,.�k <br /> i�:�:i�:�n�;/114_41/J.. <br /> 3. Since perforations 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 perforations. <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 figure E-4 to assure the number of perforations per lateral guarantees ' <br /> < 10%discharge variation. <br /> 16 spaces+1 = 17 perforations/lateral <br /> E-4 Maximum Number of 1/4 inch petforations E-6 Perforation Dischar e in GPM <br /> er lateral to uarantee<10%discha e variation 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 13 17 26 5 0.94 1.26 1.65 <br /> 3.3 7 12 16 25 a. Use 1.o foot tor single-tamily homes. <br /> 4.0 7 11 15 23 b.Use 2.o teet tor anything else <br /> 5.0 6 10 14 22 <br /> 6. A.Total number of perforations=perforations 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/perf. Does not apply to at-grades. <br /> 1. Rock bed area=rock width(ft)x rock length(ft) <br /> 10 ft x 50 ft= 500 ftZ <br /> 2. Square foot per perforation=Rock Bed Area/number of perfs(6) <br /> 500.0 ft2 ! 51 perfs = 9.8 ft/perf <br /> 7. Determine 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/perfs= 37.7 gpm <br /> 8. If laterals are connected to header pipe as shown 'l� <br /> in Figure E-1,to select minimum required lateral � • , <br /> ��`_. <br /> diameter;enter figure E-4 with perforation spacing(2)and .. , , <br /> number of perforations per lateral(5). F�c�,.E-,:Ma^�r��d�o��-a o�E^°o'Sy�,.m <br /> Select minimum diameter for perforated laterals= 2.0 inches <br /> 9. If perforated lateral system is attached to manifold pipe ,�w,�;G�„a,,,;'�;,;,,^� • <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. ' � <br /> I here certify that I have completed this work in accordance with all applicable ordinances, rules and laws. <br /> �'/ (signature) 810 (license#) // } C� (date) <br /> ;J' Page 1 of 1 <br />