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� OSTP Pressure Distribution <br /> UN I VEKSITY <br /> MinnesotaPollution Design Worksheet OF :VjINNESOTA <br /> Control A enc �,���- <br /> ProjectlD: 5i�9;t5 v ti.09.22 <br /> 1. Select Number of Perforated Latera(s in rystem/zone: � <br /> (2 Jeet is minrmum and 3 Jeet is maximum spacing} ; r • :`.-� <br /> 2. Selec[Perforation Spacing: 3.0 ft " ' ""�"'�" � __ __ <br /> 3. Select Per oration i „�„ ,�,. .�,, �.�,. M„„�„',�` ', <br /> j D ameter Size 7/32 in _ <br /> nl�...k <br /> . ._.. . __... .._—_—. ..__._ _... .._.._--___—.._" <br /> 4. Length of Laterols =Media Bed Length - 2 Feet. �^�� ' '��' ����� ���� ��' <br /> 63 - 2ft = 61 ft Perforation can not be closer then 1(oot from edge. <br /> 5• Determine the Number o(Perforation Spoces. Divide the Length of La[erofs ILine 4)by the Perforation Spacing �Line 2)and <br /> round down to the nearest whole number. <br /> Number oJ Perjoration SpQces = 61 ft - �3 ft = 20 Spaces <br /> 6. Number of Perforations per La[erol is equal [0 1.0 plus the Number of Perforotion Spaces (Line 51. <br /> Perfora[ions Per Lotera! = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Check table below to verijy the number of perforotions per lateral guarontees(ess than a 10°�discharge voriation. The value is <br /> double if the a center manijo(d is used. <br /> Maximum Number of Perfor�tions Per Latenl to Cxiuu�tee�10l/Dnch�rye Vanation <br /> ',Inc P orahons 7;32 Inch Pe+fora0ons <br /> Perforuwn Spac,ng IFeetl �'���1ete�flnchesl Perforaoon Spxir�g Pipe Diametet flnchesl <br /> � t u 1�^ 2 3 �Fret I 1 1� 1�� 2 3 <br /> 2 10 13 18 30 60 2 11 16 2t 34 68 <br /> 2�: 8 �2 16 28 S� 2�: 10 t� 10 31 6� <br /> 3 E 12 16 25 52 3 9 14 19 30 60 <br /> 3 16 Inch Perforatiurs t '81r►ch Perforatbns <br /> Pe+fonaon �Pe�'^eter Ilnchesl Perfontion Spxinq Pipe Aameter(inchesl <br /> SpacmplFeet) 1 11t 1ti: 2 3 iFeetl 1 ik 1w i 3 <br /> i +z �a ib +� e� i 2� 33 +� �4 ��9 <br /> 1�^• 12 17 2i 44 d0 1�: 20 30 �1 69 135 <br /> 3 12 1b 22 37 75 3 20 29 3d 64 128 <br /> �• Total Number of Perforotions equats the Number oJ Perjorotions per Laterol �Line 6)mul[iplied by the Number of <br /> Perforated Laterals (Line 1�. <br /> 21 Perf. Per Lateral X �Number of Perf. laterals = b3 Total Number of Perf. <br /> S. Calculate[he Square Fee[per Perforation. Recommended value is 4-10 J[' per per(orotion. ►«�«•n�,or�n.,�.�on„ <br /> hr/w�tbn D1�m�Yr <br /> Does not apply to At-Grades N��a���� <br /> ��-T�.� : '�. <br /> Bed Area = Bed Width (f[1 X Bed Length �ft► ,o�" ' o u o:+� o.0-1 0�• <br /> is o:: i os, o�+ o+ <br /> 10 fc x 63 fc = 630 fcZ :°' °� °" °.'° ,°. <br /> zs o:, o.s o... ,,� <br /> ].O O 12 0.72 O.N ... 1.L <br /> Square Foot per Perforation = Bed Areo divided by the Totaf Number o/Perjorations �Line 7). •a o��o n + +� �.� <br /> s.o'o��— o.n �.ts ,as <br /> —�------- --- .. ___. <br /> CweYhng with S;14 mc�lo���•�c� <br /> 630 ft` .- 63 pertorations = 10.0 ft2/perforaUons "°°` �o.�o�.�w� <br /> owe�nn�w,cn„e��Kn peno,.�om <br /> i'w� ��an�.n��M;x�m�.e.n..dw.•.Ts...��nai�e <br /> 9. Select Minimum Average Head: 1.0 ft _ ,rc�,o,,.,�,�„„o,.,b„ <br /> 5'eet �:��+era�,t�W�snmer[send+KSt5w/tni/Olnc� <br /> ''.Perto�ettom. <br /> 10. Select Perforation Dischorge �GPM►based on Table 111; �.56 GPM per Perforation <br /> 1�• Determine required Ftow Rote by multiplying the Totai Number oj Perforations (line 7�by the Perforation Discharge �Line 10). <br />