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OSTP Pressure Distribution <br /> Minnesota Poilution UNIVERSITY - <br /> Controi A enc Design Worksheet OF MINNESOTA : ��,��,`�; <br /> ProjectlD: v 11.09.22 <br /> 1. Select Number of Perforated totera(s in system/zone: C� ---- <br /> (2 feet is minimum and 3 feet is moximum spocing) '°��`��•"����° ����• <br /> �� " _ .� __ r : <br /> 2. Setect Perforation Spacing: 3.0 ft "` " '�'`s ' " - -- <br /> � � <br /> '1>�.�In�.�tiuii��q�.�c..<I 3':���. Mi��mot r xk ±17.. <br /> 3. Setect Perforation Diameter Size 7/32 in _ <br /> �� 6.•i�l rnck <br /> 4. Length of Latera(s =Media Bed Length-2 Feet. ���������.���o�s�:�"�, , �„ ,: �,.,f�,,;,,;o„s�,a�,�4:�•,�3 <br /> 63 - 2ft = 61 ft Perforation con not be doser then 1 foot from edge. <br /> 5• Determine the Number of Perforation Spoces. Divide the Length of Loterals (Line 4)by the Perforation Spocing (Line 2)and <br /> round down to the nearest whole number. <br /> Number of Perforation Spaces = 61 ft - �ft = 2p Spaces <br /> 6. Number of Perforations per Latero( is equal to 1.0 plus the Number of Perforation Spaces (Line 5). <br /> Perforations Per Latera( = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Check table be(ow to verify the number of perforations per(ateral guarantees less than a f0%discharge variotion. The value is <br /> double if the a center manifo(d is used. <br /> t�ximu�-,Number of Pe�fa�ations F�Lateral to Cwarantee<{�n Discharge Variat�c� <br /> ',inc7 F'�torcons 7Ji2 in�h F'�!fGTehDt15 <br /> Pe�urat���S�actng IFeetl <br /> F��Diarraei�r{inches? Perforation S�cing Fip�e tT:ameter�fnches! <br /> t i�t 1z: Z 3 i.f�tl t tt: 1�� 1 x <br /> 2 1t� t3 18 30 60 2 11 16 Zt 3� b8 <br /> ��� 8 t2 ib 28 54 2�: !0 t� 20 32 54 <br /> 3 8 12 16 25 52 3 9 14 19 30 6C1 <br /> 3/16 Inch Pert�xations I'$Inch Po_rterati�ns <br /> F-r�fcra:•�n Spacing iFeet) <br /> �P'"���_�"{��x�s) Pe�foration Spacir� Pipe�ame#er(lnchesf <br /> 1 1u: i�: 2 3 (Feet) t ik_ tt: 2 3 <br /> t 11 18 26 4b 87 2 2t 33 44 74 1�9 <br /> 1t: 12 1? "[4 40 8t� ��� 20 3Q 41 59 135 <br /> } 12 16 22 37 TS 3 2� 29 38 64 12E <br /> 7• Tota(Number of Perforations equals the Number of Perforations per Latera( (Line 6) multiplied by the Number of <br /> Perforated Latero(s (Line 1). <br /> 21 Perf. Per Lateral X ��Number of Perf. Laterats = 63 Total Number of Perf. <br /> 8. Catculate the Square Feet per Perforation. Recommended value is 4-10 ft z per perforation. P�r�.e�w„o,��ne���c�,� <br /> Does not app/y to At-Grades PerforatlonDiametcr <br /> Head(!t) <br /> ,�e �/e '�i. '/� <br /> 8ed Area = Bed Width(ft)X Bed Length(ft) ,.o• o.�B o.4, o.sb o.�� <br /> 1.5 0.22 0.51 0.69 0.9 <br /> 10 ft x 63 ft = 630 ftZ =-°° °.� °.59 °.� ,.o; <br /> 2.5 0.29 0.65 0.89 1.17 <br /> 3.0 0.32 0.72 O 96 1.2B <br /> Squo�e Foot per Perforation =Bed Area divided by the Tota(Number of Perforations (Line 7). j.o 0.3� o.e� ,.�, ,.., <br /> 5.0` 0.41 0.93 1,26 �.65 <br /> 630 fcZ - 63 perforations = 1 O.� ftZ/perforations �f�� PeNo'ra p�i�h 3n6�nch�o va inch <br /> Dwelli�wi[h i i8 irrch pMoracior¢ <br /> 2 fee[ O;her escoUh,hme�ts and N,575 wi[�;/16 <br /> 9. Select Minimum Average Head: 1.0 ft in[h to t ia inU pertoratior¢ <br /> s rrec a.ne��eaw�:nme�u a„a r+,srs wrtn,re���n <br /> peHoratbns <br /> 10. Select Perforation Dischorge (GPM) based on Table IIi: 0.56 GPM per Perforation <br /> 1�• Determine required Flow Rate by multiplying the Tota(Number of Perforatfons (Line 7)by the Perforation Discharge (Line 10). <br />