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� OSTP Pressure Distribution <br /> UNIVERSITY � <br /> Minnesota Pollution Design Worksheet OF MINNESOTA '`"� <br /> Control Agency ���.,,- <br /> 1. Select Number of Perforated Laterols in rystem/zone: �� �eo'exi��e <br /> o�oD��D�d OCOvD��aDS.�rD�avD��'po. Minimum'�74p�pgOn o��0yp <br /> (2 feet is mfiimum and 3 feet is maximum spacing) o'G /"perforations spaced 3'apar�_�od 2 of w:k�o M1o��O� <br /> �eD <br /> 12• <br /> 2. S2�ECC PPffOfQt1011 SPUCI(1�: 3.� ft �r���c��o�o�'�,�'�o� k�c��odoo�dao�3��0" <br /> �a��������o�o�o�ao� 9-ot ro:J�o�%.o�oM Dol�Dot�rD�aDo <br /> o'�o" qo°,.�oo�o�.,o,�co� ��o`�oo�oo��o��oo� <br /> 3. Select Perforation Diameter Size 7�32 inch perforatlon sizing:`l�' ro'l." <br /> Perforation aci :2'to 3' <br /> 4. Length of Latern(s =Media Bed Length-2 Feet. Perforation con not be c(oser then 1 foot from edge. <br /> 63 - 2ft = 61 ft <br /> 5• Determine the Number of Perforation Spnces. Divide the Length of Laterals (Line 4)by the Perforation Spacing (Line 2)and <br /> round down to the nearest whole number. <br /> Number of Perforntion Spaces = 61 ft - C�ft = 20 Spaces <br /> 6. Number of Perforations per Lateral is equal to 1.0 ptus the Number of Perforation Spaces (Line 5). <br /> Perforations Per Lateral = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Check Tabie 1 to verify the number of perforations per latera(guarantees(ess than o 10%discharge variation. The vatue is doub(e if <br /> the a center manifold is used. <br /> �• Total Number of Perforotions equals the Number of Perforotions per Lateral (Line 6)multiplied by the Number of <br /> Perforated Laterals (Line 1). <br /> 21 Perf. Per Lateral X �Number of Perf. Laterals = 63 Total Number of Perf. <br /> 8. Calcutate the Square Feet per Perforation. Recommended vaiue is 4-10 ft 2 per perforation. ,��a,tl�o�a�ge w�,,�� <br /> Does not app/y to At-Grades , ,K,,,,„�,p,,m«K <br /> '�H�,a nn ,,. 'i,. 'i„ 'i. <br /> Bed Area = Bed Width(ft)X Bed Length(ft) <br /> �:' 1.0' 0.18 0.41 O.Sb 0.74 <br /> 10 ft X 63 ft = 630 ftZ +_5 o.=Z o.s, 0.69 0.9 <br /> 2.0° 0.26 0.59 0.80 1.04 <br /> - 2.5 0.29 0.65 0.89 1.17 <br /> Square Foot per Perforation =Bed Area divided by the Total Number of Perforotions (Line 7). =•0 0.�: o.�: o.9s ,.:a <br /> ' 4.0 0.37 O.bl 1.13 t.a7 <br /> � 5.0` 0.4/ 0.93 1.26 1.65 <br /> 630 ftZ = 63 perforations = 1 O.0 ftZ�perfO�a[10�1$ �f�� ��4 inCh aM17 3f ib inCh perfO�atioM on <br /> tlwellings <br /> 9. Select Minimum Average Head: 1.0 ft � 7�8 inch perforations on dweltir.gs and for <br /> ,� 2 feet other esta6lishmencs <br /> t/4 in^.h aM 3/1tr inch pefora[kns on MSTS <br /> ! 5 feet t�8 inch pe�foretions on M5T5 <br /> __.___- _�.___ _..._.. . _..._ __..__ <br /> 10. Setect Perforation Discharge (GPM)based on Tabte III: 0.56 GPM per Perforation <br /> >>- Determine required Flow Rate by multiptying the Total Number of Perforotions (Line 7)by the Perforation Discharge (Line 10). <br /> 63 Perforations X 0.56 GPM per Perforation = 36 GPM <br /> 12. Select Type of Manifo(d Connection (End or Center): � end ❑ Center <br />