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� � � OSTP Pressure Distribution <br /> UNIVERSITY <br /> Minnesota Pollution Design Worksheet OF MINNESOTA . <br /> Co�trol Agency <br /> 1. Select Number o Per porated Latera(s in stem/zone: � Geotextile <br /> f ! � �1psplp��Ipjblqp0��o0z Minimum�o� OapoBpapoO <br /> (2 feet is minimum and 3 feet is mmcimum spacing) oc !.'pertorations spaced 3'apart �c3 2"o(rock� M1p���� <br /> 2. Select Per oration 5 cin : 3.0 ft �< ����� � � 1z" <br /> f PQ � o�o Cuo 0 0`Cao 0 0 0 0 0 <br /> �� �' t��._ , a�' �'�'�K°�' <br /> DaqrpoC7pOBOeDo�eD�0av,0o�✓DoUr 9�.co��f Vroc-k-t�RDn�a�,Do�Do�O���ao,D��Da�Do <br /> od�d�0'�O`p�p0`�q0�0'q� L�'O°-c�O�O�Q0�0'�O'nU0°��O' <br /> 3. Select Perforotion Diameter Size 1/4 inch <br /> Perforation sizing:'/a"to'/." <br /> Perforation s acin :2'to 3' <br /> 4. Length of Laterals =Media Bed Length -2 Feet. Perforation can not be c(oser then 1 foot from edge. <br /> 38 - 2ft = 36 ft <br /> 5• Determine the Number of Perforation Spaces. Divide the Length of Latera(s (Line 4)by the Perforation Spacing (Line 2)and <br /> round down to the nearest whole number. <br /> Number of Perforation Spnces = 36 ft .- �ft = 12 Spaces <br /> 6. Number of Perforations per Lotero( is equal to 1.0 plus the Number of Perforation Spaces (Line 5). <br /> Perforations Per Lateral = 12 Spaces + i = 13 Perfs. Per Lateral <br /> Check Table i to verifty the number of perforations per(aterai guarQntees less than a ]0%discharge variation. The va(ue is double if <br /> the a center manifold is used. <br /> 7. Tota(Number of Perforations equals the Number of Perforations per Laterat (Line 6)multiplied by the Number of <br /> Perforated Latera(s (Line 1). <br /> 13 Perf. Per Lateral X �Number of Perf. Laterals = 39 Total Number of Perf. <br /> 8. Calculate the Square Feet per Perforation. Recommended va(ue is 4-10 ft Z per perforation. �,Qatl�,aw,�c�PM� <br /> Does not app/y to At-Grades P�raan�a�«� <br /> Bed Areo = Bed Width (ft)X Bed Length(ft) "�d�`� ''• ''�• ''°_ ''. <br /> �.o• o.�a o.�i a.ss o.�a <br /> 10 ft X 38 ft = 380 ftz +•5 o.0 o.5, Q69 0.9 <br /> Z,p� 0.26 0.59 0.80 1.04 <br /> 25 0.29 0.65 0.89 7.17 <br /> Square Foot per Perforation =Bed Areo divided by the Totat Number of Perforations (Line 7). '•° o.3z o.�z o.so ,.z8 <br /> a.o 0.3� o.a3 �.0 t.a� <br /> 5.0` 0.47 0.93 1.26 1.65 <br /> 380 ftZ : 39 perforations = 9.7 ftZ/perforations ,,m� ��d�^�h a,d J/76 inch perforatioru on <br /> ����� <br /> 1/8 inch peAwatlua on dweilirgs and for <br /> 9. Select Minimum Average Head: 1.0 ft ���� olher establishments <br /> 1/4 inch and 3/16 4xh peforatbru on MSTS <br /> 5 feet 1/S inch pertoraHau on MSTS <br /> 10. Select Perforation Discharge (GPM)based on Table III: 0.74 GPM per Perforation <br /> 11. Determine required F(ow Rate by multiplying the Total Number of Perforations (Line 7)by the Perforation Discharge (Line 10). <br /> 39 Perforations X 0.74 GPM per Perforation = 29 GPM <br /> 12. Select Type of Mnnifold Connection (End or Center): �end ❑Center <br />