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�„��a"�....�., <br /> Pressure Distribution Design _ �: � <br /> Minnesota Poliution Worksheet �: � � � � � <br /> _ � <br /> Control Agency ''`��� <br /> Geotextile <br /> 1. Setect Number of Perforated Laterals : 3 ������p���oqmot Minimum " "'D� � <br /> (2-3 foot spacing) o �� perforations spaced 3'apart�q 2'of rock� � <br /> 2. Select Perforation Spacing: 3.0 ft �a- _- -�?�-- - <br /> Note:Must use 2 feet for media filters 9�°�fOC�` � <br /> 3. Select Perforation D�ameter Size 7/32 inch v�toranon s�zug:��.'w��.• <br /> Perfaa6on ' •2'w 3' <br /> 4. length of Laterals =Media Bed Length-2 Feet. Perforation can not be closer then 1 foot from edge. <br /> 63 - 2ft = 61 ft <br /> 5• Determine the Number of Perforation 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 - �3�ft = 20 Spaces <br /> 6. Number of Perforations per Lateral is equal to 1.0 ptus the Number of Perforotion Spaces (Line 5). <br /> Perforotions Per Latera! = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Check Table J to ensure ttwt the number of perforations per lateral guarantees tess than a 10%discharge variation. <br /> 7• Tota(Number of Perforations 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. Calculate the Square Feet per Perforotion. Recommended vatue is 4-10 ft2 per perforotion. T,�i�� <br /> Does not appl y to At-Grodes Perfora�oo oisawr8e Ic� <br /> Bed Areo = Bed Width(ft)X Bed Length(ft) Ferioration Diameter <br /> Head ft <br /> ( ) i�e ��u ��n ��� <br /> 10 ft X 63 ft = 630 ftZ �,� o.�s o.�� o.sa o.�4 <br /> Z_p° 0.26 0.54 0.80 1.�4 <br /> Squore Foot per Perforation =Bed Area divided by the Total Number of Perforotions (Line 7). 5• o.at 0.93 t.2e 1.65 <br /> a:Use t A fa dwelli�s�aing 114 inch or 3/16 ind� <br /> hdes. <br /> 630 ft2 = 63 perforations = 10.00 ftZ/perforations n:u�z.o ra a�i��;�i�e;�n na�;a,r� <br /> other establishments usinq 1/4 inch or 3/16 inch <br /> 9. Seled Minimum Avera e Hend: 1.0 ft �� <br /> g c:Use 5A for other estabUstene��atog 118 fiuh <br /> perfaatlas and media fllters. <br /> 10. Select Perforntion Discharge (GPM)based on Table III: 0.56 GPM per Perforation <br /> 11. Determine required Flow Rate by multiplying the Totol Number of Perforations (Line 7)by the Perforotion Dischorge (Line 10). <br /> 63 Perforations X 0.56 GPM per Perforation = 36 GPM <br /> 12. Select Type of Manifold Connection (End or Center): �End ❑Center <br />