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OSTP Non-Level Pressure Distribution <br /> ;.!innesota UNIVERSITY <br /> Pollution <br /> Design Worksheet OF MINNESOTA <br /> Control Agency <br /> 1. Enter soil treatment area(STA)length in order of the Highest Elevation to the Lowest Elevation: <br /> v 11.05.31 <br /> Lateral 1 Pipe Elevation n ft Lengrh of STA from manifold ®ft Highest <br /> Lateral 2 Pipe Elevation ft Length of STA -� ft <br /> Lateral Pipe Elevation ]ft Length of STA ft <br /> Lateral 4 Pipe Elevation ft Length of STA ft <br /> Lateral 5 Pipe Elevation �ft Length of STA ft <br /> Lateral 6 Pipe Elevation ��ft Length of STA ft Lowest <br /> 2. Calculate Change in Elevation over the laterals <br /> =Highest Elevation(Lateral 1)-Lowest Elevation(Last Lateral above) ��? ft f[ 27,P Ift <br /> 3. Select Minimum Average Head: /, 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 /> /y ft + � ft 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 Change in Elevation from Lateral 1. <br /> Minimum Average Head ttevauon or elevation or <br /> t arPrai t ar„ral Pressure Head <br /> Lat 1 �a ft + [��—�f[ -C�ft] _ �� ft <br /> Lat 2 , ft + ( //11 ��ft - �jli ft) _ �i ft <br /> Lat 3 ��ft + [j—--��ft ft] = C�ft <br /> Lat 4 ft + ft ft] _ �ft <br /> Lat 5 C�ft + [E=ft =ft] _ ��ft <br /> Lat 6 �]ft + [=ft ft] _ =ft <br /> 6. Determine the Flow Rate per Hole <br /> Select a Perforation Diameter and the corresponding gallons per minute from the Q = 19 <br /> .65 ed 2 <br /> Perforation Discharge table below,adjusting as needed. c=0.60•d=perforation diameter;h=pressure head <br /> or Calculate Perforation Discharge(Q)in GPM: <br /> t 1 Pressure Head <br /> r ft Perforation Diameter � � _ <br /> �. � GPM Highest <br /> j� Lat 2 Pressure Head '',..�. � ft Perforation Diameter GPM <br /> Lat 3 Pressure Head ft Perforation Diameter _ GPM <br /> Lat 4 Pressure Head ��ft Perforation Diameter _ GPM <br /> Lat 5 Pressure Head ft Perforation Diameter = u GPM <br /> Lat 6 Pressure Head ft Perforation Diameter E:= GPM Lowest <br /> & <br /> ,-2.> <br /> r 4j')0 <br />