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OSTP Non-Level Pressure Distribution <br /> UNIVERSITY - 't <br /> Minnesota Pollution Design Worksheet OF MINNESOTA NM, <br /> Control Agency <br /> Project ID: v 11.09.22 <br /> 1. Enter soil treatment area(STA)length in order of the Highest Elevation to the Lowest Elevation: <br /> Lateral 1 Pipe Elevation 1001.2 ft Length of STA from manifold 32 ft Highest <br /> Lateral 2 Pipe Elevation 1001.2 ft Length of STA 32 ft <br /> Lateral 3 Pipe Elevation 1001.2 ft Length of STA 32 ft <br /> Lateral 4 Pipe Elevation 999.8 ft Length of STA 32 ft <br /> Lateral 5 Pipe Elevation 999.8 ft Length of STA 32 ft <br /> • <br /> Lateral 6 Pipe Elevation 999.8 ft Length of STA 32 ft Lowest <br /> 2. Calculate Change in Elevation over the laterals <br /> =Highest Elevation(Lateral 1)-Lowest Elevation(Last Lateral above) 1001.2 ft - 999.8 ft = 1.4 ft <br /> 3. Select Minimum Average Head: 1.0 ft <br /> Use 1.0 ft for dwellings using 3/16 to 1/4 inch perforations. <br /> Use 2.0 ft for dwellings using 1/8 inch perforations;or,for MSTS or other establishments using 3/16 to 1/4 inch perforations. <br /> This worksheet cannot be used for a Minimum Average Head of 5.0 feet. Design must be modified or valving must be used to <br /> equalize flow. <br /> 4. Calculate the Total Head=Minimum Average Head(Line 3)+Change in Elevation (Line 2) <br /> 1.0 ft + 1.4 ft = 2.4 ft <br /> 5. Calculate Pressure Head for Each Lateral <br /> A.Highest trench elevation(Pipe Elevation 1):Pressure Head equals Minimum Average Head(Line 3) <br /> B.All other trenches:Pressure Head equals Minimum Average Head(Line 3)plus the Charge in Elevation from Lateral 1. <br /> Elevation of Elevation of <br /> Minimum Average Head Pressure Head <br /> Lateral 1 Lateral <br /> Lat 1 1.0 ft + [ 1001.2 ft - 1001.2 ft] = 1.0 ft <br /> Lat 2 1.0 ft + [ 1001.2 ft - 1001.2 ft] = 1.0 ft <br /> tat 3 1.0 ft + [ 1001.2 ft - 1001.2 ft] = 1.0 ft <br /> Lat 4 1.0 ft + [ 1001.2 ft - 999.8 ft] = 2.4 ft <br /> Lat 5 1.0 ft + [ 1001.2 ft - 999.8 ft] = 2.4 ft <br /> Lat 6 1.0 ft + [ 1001.2 ft - 999.8 ft] = 2.4 ft <br /> 6. Determine the Flow Rate per Hole I C�2 <br /> Select a Perforation Diameter and the corresponding gallons per minute from the `4 = 1 • <br /> Perforation Discharge table below,adjusting as needed. <br /> c-41.60;d=perforation diameter;h=pressure head <br /> or Calculate Perforation Discharge(Q)in GPM: <br /> Lat 1 Pressure Head 1.0 ft Perforation Diameter 7/32 = 0.56 GPM 0.2187!Highest <br /> Lat 2 Pressure Head 1.0 ft Perforation Diameter 7/32 = 0.56 GPM 0.21875 <br /> Lat 3 Pressure Head 1.0 ft Perforation Diameter 7/32 = 0.56 GPM 0.21875 <br /> Lat 4 Pressure Head 2.4 ft Perforation Diameter 7/32 = 0.87 GPM 0.21875 <br /> Lat 5 Pressure Head 2.4 ft Perforation Diameter 7/32 = 0.87 GPM 0.21875 <br /> • <br /> Lat 6 Pressure Head 2.4 ft Perforation Diameter 7/32 = 0.87 GPM 0.2187!Lowest <br />