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m�s' '? <br /> OSTP Non-Level Pressure Distribution UNIVERSITY ' <br /> � ` <br /> Minnesota Pollution Desi�n Worksheet OF MINNESOTA • �~ <br /> Control A enc ��\_y <br /> 1. Enter soil treatment area(STA)tength in order of the Highest Elevation to the Lowest Etevation: <br /> Lateral 1 Pipe Elevation 950.6 ft Length of STA from manifold 32 ft Highest <br /> Lateral 2 Pipe Elevation 948.4 ft Length of STA 32 ft <br /> Lateral 3 Pipe Elevation �ft Length of STA �ft <br /> Laterat 4 Pipe Elevation �ft Length of STA �ft <br /> Lateral 5 Pipe Elevation �ft Length of STA �ft Lowest <br /> 2. Catculate Change in E(evation over the laterals <br /> =Highest Etevation(Laterat 1)-Lowest Elevation (Last Laterat above) 950.6 ft _ 948.4 ft = 2•2 ft <br /> 3. Select Minimum Average Head: 1.0 ft <br /> Use 1.0 ft for dwellings using 1/4 inch or 3/16 inch holes. <br /> Use 2.0 ft for dwetlings using 1/8 inch hotes;or,for MSTS or other establishments using 1/4 inch or 3/16 inch holes. <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 /> equatize ftow. <br /> 4. Calcutate the Tota!Head =Minimum Average Head (Line 3)+Change in E(evation (Line 2) <br /> 1.0 ft + 2,2 ft = 3.2 ft <br /> 5. Calculate Preswre Head for Eoch Latera( <br /> A. Highest trench etevation(Pipe Elevation 1):Preswre Head equals Minimum Avera�e Head (Line 3) <br /> B.All other trenches:Pressure Head equals Minimum Average Heod (Line 3)plus the Change in Elevation from Lateral 1. <br /> Minimum Average Head tieva[ion or tievation or Pressure Head <br /> I atPral 1 I ataral <br /> l.at 1 1.0 ft + [ 950.6 ft - 950.6 ft] = 1.0 ft <br /> �at 2 1.0 ft + ( 950.6 ft - 948.4 ft] = 3.2 ft <br /> Lat 3 �ft + [�ft -�ftl = �ft <br /> Lat 4 �ft + [�ft -�ftl = �ft <br /> Lat 5 �ft + [�ft -�ftl = �ft <br /> 6. Determine the Flow Rate per Ho(e � = 1 9 . 65 cd 2 � <br /> Select a Perforation Diameter and the corresponding gallons per minute <br /> from the Perforation Discharge table betow,adjusting as needed. c=0.60;d=perforation diameter;h=pressure head <br /> or Calculate Perforation Discharge(�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 3.2 ft Perforation Diameter 7/32 - 1.01 GPM 0,21875 <br /> Lat 3 Pressure Head � ft Pertoration Diameter� - � GPM FALSE <br /> Lat 4 Pressure Head � ft Perforation Diameter� � � GPM FALSE <br /> Lat 5 Pressure Head � ft Perforation Diameter� - � GPM FALSE Lowest <br />