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' � � ' PRESSURE DISTRIBUTION SYSTEM Geotextue Eabrtc
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<br /> 1. 'Select number of perforated lateraLs 3 arter ineh ��n�� .�a�s�
<br /> :.. ,
<br /> , �:,: .
<br /> 3 _� , .�::<<,�;}.:4� Qf,rock .
<br /> 2. Select perforafion spacing=�._ft � "`
<br /> Perf S 3/16"-1/4"
<br /> 3. Since perforations should not be placed closer than 1 foot to p�SP�S l.s�-5�
<br /> the edge of the rock layer(see diagram),subtract 2 feet from
<br /> the rock layer length. E-4: Maximum aAowable number of 1/4inch pedoraHons
<br /> per latard b�arcntea<t0%dtachar�e vadatfon
<br /> � �r �� -2 ft =�`' S ft periorcflon
<br /> 4. Determine the number of spaces between perforations. `��
<br /> fee l inch ].251nch .l.b•inch 2.O inch
<br /> Divide the length(3)by perforation spacing(2)and��
<br /> �y�to nearest whole number. 2c5 8 14 18 28
<br /> Perforation spacing= �S ft+�,o ft=�spaces 3A ` 8 13 17 26
<br /> 3.3 1 12 16 � 25
<br /> 5. Number of perforations is equal to.one plus the number of 4.0 7 11 15 23
<br /> perforation spaces(4)..Check�gure E-4 to assure the number of �,p 6 10 14 22�
<br /> perfor.qtions per la�eral guarantees <10%discharge variation.
<br /> ��,SpaCeS+1 =�_peifOratiOns/13teral E-6: Perforation Discharga in gpm
<br /> 6. A: Total number of perforations= perforafions per lateral-(5) perforotion d(ameter
<br /> Inches
<br /> times number of laterals(1) _ g ���a ��� (fee) 3/16 7/32 1/4
<br /> �tq_per£s/lat x�_lat—�_perfora 1.OQ 0.42 0.56 0.74
<br /> B. Calculate the square footage per perforation. 2,Ob 0.59 0.80 1.04
<br /> Should be 6-10 sqft/perf.Does not apply to at-grades.
<br /> Rock bed area= rock width(ft)x rock length(ft) 5.0 0.94 1.26 1.65
<br /> „��_ft X�ft=��s.qft a u�i.Q toot fsx air�p�e-torr��y homes.
<br /> Square foot per perforation=Rock bed area+number of perfs (6) b usa 20 feet for on in aise.
<br /> S7c� sqft+,�2_perfs=1v,p sqft/perf ►1y�/p�,p �A7� AT QID OF MIEfN/IC DISTRIBUTION SYSTEM_
<br /> 7. Deterrrune required flow rate by multiplying the t�otal number of
<br /> perforations (6A).by flow per perforation'(see figure E-6) ��°
<br /> .�
<br /> `d� perfs x�gpm/perfs=�_._.$p� .� ,��.
<br /> �„..,r..
<br /> 8. If laterals are connected to header.pipe as shown on upper ,� ��;�•�-,,,
<br /> example,to select ai��mum required latera�di�neter;enter �M,�""'°
<br /> figure E-4 with perforation spacing(2)and number of perforations \�
<br /> per lateral(5) Select�miniinunl diameter for ,,,o,,,„�,,,n,„�,,,��,�,,�,
<br /> perforated lateral= inches. "�'""`°"*"""`�°"""°°"°
<br /> .o...�.�.,�..r
<br /> 9. If perforated lateral system is attached to manifold pipe near ��,,.�,.,�� ��„�,,,��"
<br /> the center,lower diagram,perforated lateral length(3) and „�,.
<br /> number of perforations per lateral(5)will be approxiniately one ��,�»•�-
<br /> half of that in step 8. Using these values,select mirtunum , `' -,�.�.�,;,�.,;�;,
<br /> diameter for perforated lateral= ��inches. „,�. �, �
<br /> . . . ���
<br /> .,.:�. .-p
<br /> J�M r
<br /> I hereby certify that I ha e com leted this work in accordance with applicable ordinances, rules and laws.
<br /> �� % i ature 3�1 (license#) � �a-�"'�� (date)
<br /> $� �
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