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� � OSTP Pressure Distribution <br /> Minnesota Pollution UNIVERSITY r' <br /> Control Agenty Design Worksheet OF MINNESOTA `,,����, <br /> 1. Select Number of Perforated L.aterals in system/zone: �3 � ��Q <br /> (2 feet is minlmum and 3 feet is maximum spacing) '�` � 3' ;�M�a�iodc <br /> 2. Select Perforation Spacing: 3.0 ft � _ �z' <br /> • 9°ol rotJc <br /> 3. Select Perforotion Diometer Slze 1/4 inch <br /> Perforation siring:'/e'to�/," <br /> P�aAoratlon Y ro 9' <br /> 4. Length oJ Lnterals =Media Bed Length-2 feei. Perjorntion con rrot be c(oser then t foot:from.edge. <br /> 50 - ztc = 48 ft <br /> 5. Determine the Number of Perforatfon Spaces. Divide the Length of Loterals (Line 4)by the Perjoration Spacinq (Line 2)and <br /> round down to the nearest whole number. <br /> Number of Perforatton Speces = 4$ ft + �ft = 16 Spaces <br /> 6. Num6er of Perforations per Latervl is equal to 1.0 plus the Number of Perforntion Spnces (Line 5). <br /> Perforations Per Lateral = 16 Spaces + 1 = 17 Perfs. Per Lateral <br /> Check Table 1 to verify the number of perforations per latero(gucrantees less Yhan a f0%discharge variation. The volue is double if <br /> the a tenter manifold is used. <br /> �• Total Number of Perforotions equals the Number of Perforations per Latero! (Line 6)multiplied by the Number of <br /> Perforated Loterals (Line 1). <br /> 17 Perf. Per Lateral X C�Number of Perf. Laterals = 51 Totat Number of Perf. <br /> 8. Calculate the Square Feet per Perforatfon. Recommended value fs 410 ft Z per perjoration. ����� <br /> Does not apply to At-Grodes ��a� <br /> Bed Areo m Bed Width(ft)X Bed Length(ft) "'"d� ��. �.,. �c,� ��, � <br /> ,:a o.i� o., nss o.�s <br /> �� ft X 50 ft = 500 ft� �.s o:ss- oa� aes a+ <br /> �:o• aai o.» aw �.o� <br /> i� 0.29�'. .� 0.6i � 0.N t.tt <br /> Square Foot per Perforotion =Bed Areo divided by the Tota!Number of Perforatfons (Line 7). xo o:�. o:n as. ,.�, <br /> �o o:st au �.i� �w� <br /> s. o.+� as� cu r.es <br /> 500 ftz - 51 perforations = 9.8 ftz/perforations ,�,,, ��'����and3/1fiNchpeAontlaaon <br /> �n Mcnwrror•aasona�eu�ne,w r�. <br /> 9. Select Minimum Average Heod: 1.0 ft :r«� enaw� <br /> 1 M inch and 3rt6 Inch peforatbm on MS75 <br /> �ren. �nrrJ�nerranemsm►ins <br /> 10. Select PerJorotion Discharge (GPM)based on Table ill: 0.74 GPM per Perforation <br /> 11• Determine required Flow Rate by muttiptying the Total Number of Perforotions (Line 7)by the Perforadon Discharge (line 10)_ <br /> 51 Pertorations X 0.74 GPM per Perforation = 38 GPM <br /> 12. Setect Type of Manifold Connection (End or Center): �End ❑ceneer <br />