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� � o� Univeristy of Minnesota <br /> T� Non-Level Pressure Ditribution Worksheet <br /> 1. Enber esch system lateral elevation and len in order of hlghest to lowest elevation <br /> Lateral 1 Elevation 83.3 ft Length of pipe 25 ft <br /> �.��� . , , � ;�� .. _ .. �;• <br /> �� _' . �,.. <br /> � <br /> L.ateral 3 Elewation ft Length of pipe ft <br /> �� r.: <br /> � � ��^ � � ��: <br /> � � I Lateral 5 Elevation , ft ` en9th of pipe , ft � <br /> 2. Calcula�e change in elevatlon over the laberals. <br /> Highest eleva�on-Ipvvest elevation: 83.3 - 81.3 = 2.0 feet <br /> 3. Calct�a�e the Total Head s head at aifices(either 1 or 2 f�+change in elevatfon(2) <br /> Enter 1 it�f deslgn�for a singVe fam�y home or 2 ft for anythirrg else(mn►design pressure head at perforatan) <br /> �ft + 2.0 R = 3.0 feet <br /> This worksheet can not be used if greater than 5 feet Des�gn must be mo�'red or valving must be used to equalize flow. <br /> 4. CalcWabe pressure head for esch laterai <br /> 1.Highest Trench Elevation(E1)the Head= 1 or 2 feet <br /> 2.For s�othe�laterads the p�+essune t�ead is calculated as 2 feet plus the change in elevation from Laterai 1. <br /> Later�1 Elevabon 83.3 1 0 ft <br /> . °'ra�a��="�'°' �a i F�� c" J � y � � � �� � ,� �., "'��r�', <br /> .�t.,��.� '"' � �:='«' �* ,i� ��; . . ,sa..�, '���.+�.... . �.a�_�.�:s5.�.... z`,` „�;� . <br /> j� -I <br /> Lateral 3 Elevation 0 0 0 + [E1 -E3] = 0 + [ �83.3 0 0 ]= 0 0 ft <br /> . �.����� ' � ti�'. <br /> �� ��„ ��- t� �,p ;:} �Ei :-.��*:°' ��.�: s"�f,.����.:.�.,�3_ `"° .`]_ <br /> Al,.aeeral 5� Elevation 0.0 0 + [E1 -E5] = 0 + [ 83.3 � _ �. ,0.0 " ]= 0.0 ft <br /> 5. Del�nnine flow rabe per fwie(See fgure E-6). <br /> Seled a pe�ratan diameter and the co�+�sponding gallons per minute interpolatin as needeci. <br /> Late�al 1 Pres 1.0 Perf Diameter 1/4 0.74 9Pm <br /> , , , ��, ,�, � � <br /> y?;�r�'y � rw,, �"„iY-� . � �� ��.� zn�4t:.� <br /> Laberal 3 ;Pres 0.0 Perf Diameter = 9Pm <br /> '�.�� . a <br /> I ..�� .ei g•V i 'c s"'` ��.5, F�. �1n <br /> +!�' ..�.�.� _ �.. _. �, � . . .� <br /> Lat�al 5 Pres � 0.0 Perf Diameter � = 9pm <br /> 6. Cakula�e flow in gallons per minuts for Laterall -Seled a spaaing�and enter in box. <br /> Number of p�foradons=[(len tlg �of pipe-2�sP�9l+1 <br /> I( 25 ft-2it) / Oft]+1 = 12 perforatior►s(Chedc figure E�4 to make sw+e it is ok) <br /> Fbw=number of perForations x flow rate <br /> 12 pe�f x 0.7 gpm = 8.9 gpm for Lateral 1 <br /> 7. Ca�ulate the gallons per minube per foot for Laterai 1 <br /> This vai�w�l then be used to make su�the gaUon per minute per foot is equiva/ent in each lateral. <br /> Gailons/length= 8.9 gpm / 25 ft= 0.36 gpm!ft <br /> E-6 Perforation Discha e in GPM E-4 Maximum Number of 1/4 inch perforations <br /> p�� lateral to uararrtee<10%discha variation <br /> H�d Perforation Diameter in inches Perf <br /> feet 1/8 3/16 7/32 1/4 Spacing <br /> 1 0.18 0.42 0.56 0.74 feet 1 in 1.25 in 1.5 in 2.0 in <br /> . . ., <br /> ,#.5 : ,0:�'2 ,: fl�51 . 0.68 0.90 2 5 8 14 18 <br /> 2 0.26 0.59 0.80 1.04 �}� ..8.;: . _,.9;3�� . . . :; '�? , �: 26 <br /> ` `��' 1:,�?` 3.3 7 12 16 25 <br /> ��;_t' r,.. �aa�� „ �. <br /> 3 0:�� 0.�2� o.ss ��z8 .� ���`:�: ��.�`�� �„���Kj����z',�n . �:�;:� .. <br /> :��,�s�;_ �� r�;�.• '�!:'�3 �'1.47'` 5.0 6 10 14 22 <br /> � 5 0.41 0.94 1.26 1.65 <br /> Page 1 of 2 <br />