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OSTP Pressure Distribution <br />Minnesota Pollution Design Worksheet UNIVERSITY <br />Control Agency OF MINNESOTA �- <br />12. Calculate the Square Feet per Perforation. Recommended value is 4.11 ft per perforation. <br />Does not apply to At -Grades <br />a. Bed Area = Bed Width (ft) X Bed Length (ft) <br />10 ft X 63 ft = 630 ft <br />b. Square Foot per Perforation = Bed Area divided by the Total Number of Perforations, <br />630 ftp 63 ]perforations = 10.0 ftZ/perforations <br />13. Select Minimum Average Head: 1.0 ft <br />14. Select Perforation Discharge (GPM) based on Table: 0.5b GPM per Perforation <br />15. Determine required Flow Rate by multiplying the Total Number of Perfs. by the Perforation Discharge. <br />63 Perfs X 0.5b GPM per Perforation = 36 GPM <br />16. Volume of Liquid Per Foot of Distribution Piping (Table Il) : 0.170 Gallons/ft <br />17. Volume of Distribution Piping = <br />Table II <br />_ [Number of Perforated Laterals X Length of Laterals X (Volume of Volume of Liquid in <br />Liquid Per Foot of Distribution Piping] Pipe <br />Pipe Liquid <br />L 3 X E:H:1 ft X 0.170 gal/ft = 31.1 Gallons Diameter Per Foot <br />(inches) (Gallons) <br />18. Minimum Delivered Volume = Volume of Distribution Piping X 4 <br />31.1 gats X 4 = 124.4 Gallons <br />Comments/Special Design Considerations: <br />1.25 <br />0.078 <br />1.5 <br />0.110 <br />2 <br />0.170 <br />3 <br />0.380 <br />4 <br />0.661 <br />- cleanouts _ <br />Manifold pipe .. <br />Alternate location <br />of pipe from pump <br />Pi a from um <br />