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OSTP Pressure Distribution uNI�ERSITY <br /> Minnesota Pollution Design Worksheet OF MINNESOTA <br /> Control A enc ~ � �0 <br /> 11. Determine required Flow Rate by multiplying the Total Number of Perforations (Line 7)by the Perforation Discharge (Line 10). <br /> 27 Perforations X 0.56 GPM per Perforation = 16 GPM <br />