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OSTP Pressure Distribution - <br /> Minnesota^Pollution LTNIVERSITY <br /> Controi Agency Design Worksheet OF MINNESOTA ��; <br /> 1. Select Number of Perforoted Latervls in systemlzone: 3 Geotextile <br /> �������� � Minfmum� � <br /> (2 feet is minimum and 3 feet is maximum spacinq) v. perforations spaced 3'apart� 2•or�x <br /> 2. Select Perforation Spacing: 3.0 ft -- �?�- - <br /> 9'of rock <br /> 3. Select Perforation Diameter Size 7/32 inch Perforatian sizing:'/.'m�i.• <br /> Perforatlon s 'n :2'W 3' <br /> 4. Length of Laterals =Media Bed Length -2 Feet. Perforotion can not be closer then 1 foot from edge. <br /> 63 - 2ft = 61 ft <br /> 5• Determine the Number of Perfor4tion Spaces. 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 Perforation Spaces = 61 ft - �ft = 20 Spaces <br /> 6. Number of Perforations per Lateral 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 1 to verifjr the number of perforations per latern(guarontees less than a 10%discharge variation. The value is double if <br /> the a center manifold is used. <br /> �• Total Number of Perforotions equals the Number of Perforations 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. Calculate the Square Feet per Perforation. Recommended value is 4-10 ftZ per perforation. �������PM� <br /> Does not appl y to At-Grades Parforatlon Dfamater <br /> Mad(ft) ��� '/u '/n '/� <br /> Bed Are4 = Bed Width(ft)X Bed Length (ft) <br /> 1.0' 0.18 0.41 0.56 0.74 <br /> 10 ft x 63 ft = 625 ftZ +•s o.:2 o.s, 0.69 0.9 <br /> zo" o.zs o.es o.ao �.a <br /> 23 0.29 0.65 0.89 1.17 <br /> Square Foot per Perforation =Bed Area divided by the Total Number of Perforations (Line 7). 3.0 0.�: o.�: o.� ,.� <br /> a.o 0.3� o.ea �.0 �.a� <br /> 625 ftZ .- 63 pertorations c 9.9 ftZ/perforations 15foot 0.41 0.93 P 1.26 7.65 <br /> 1/41'xh ard 3/16 i�h erfontlons on <br /> dwellinqz <br /> 9. Select Minimum Average Head: 1.0 ft ��8 in[h peAo�aHdis on dwellings and for <br /> 2 feet other estaDlishments <br /> 1/4 inth aM 3/16 ifxh pefo2tbr�on M5T5 <br /> 5 feec 1/8 inch perfaratiaa on M5T5 <br /> 10. Select Perforation Dischorge (GPM)based on Table III: 0.56 GPM per Perforation <br /> ��• Determine required Flow Rate by multiplying the Total Number of Perforations (Line 7)by the Perforation Discharge (Line 10). <br /> 63 Perforations X 0.56 GPM per Perforation = 36 GPM <br /> 12. Select Type of Manijold Connection (End or Center): ❑end ❑center <br />