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UnvusmaPlhaxaaou ,°, . <br /> Pressure Distribution Desi�n ��Y�� � <br /> _ � , <br /> ..,,�aa.-.i.:.� <br /> Minnesota PiaUution Worksheet _ ::�,..,�.�,wz.. ���. <br /> Corrtrol A y �..r <br /> 1. Select Number of PerforQted Latera(s(2-3 foot spacing): 1 3� � �m <br /> L--� 'l: 3' 2'�rod� <br /> 2. Setect Perforution Spocing(<9 ft 2/perforation): 3.0 ft � ' � - �? - <br /> Note:Must use 2 feet for media fltters 9'�� <br /> 3. Select Perforadon Diameter 1!4 inch ��,ti.�y� <br /> Perbrafian ' 2'�0 3' <br /> 4 Length of Lnterals =Media Bed Length-2 Feet Perforotion can not be closer then 1 foot from edge. <br /> :5a - Zr� = 4s r� <br /> 5. petermine the Number of Perforation Spoces. Divide the Length of Latemis (Lir�4)by the Perforation Spacfng (Line 2)and <br /> round down to the nearest wwhote nurr�er. <br /> Number of Perforadon Spaces = 48 ft = ��ft = 1 b Spaces <br /> 6. Number of Perforotior►s per L.oterQl is equat to 1.0 ptus the Number of Perforution Spaces (Line 5}. <br /> Perforations Per Laterai = 16 Spaces + 1 = 17 <br /> Chetk Table i to ensure dwt the nu�er of perforatia�s per fatera!guurcntees�ess Nwn a '10%dixharge variation. <br /> TaWe F' Ms�dmum l�nd�er af P�erforatiats Par Laterai t�G�uarentte:<10%Disd�arge;Variation <br /> '/,Yrd�Holes '/3=Inch tbles <br /> Perfocation Pipe Diameter(ir�es) P+erforation P�e Diameter(�nches) <br /> Spadng(Feet) 1 114 134 2 3 Spadng(Feet) 1 1�4 1f4 2 3 <br /> 2 10 ' 13 ` < 18 30 60 2 11 -' 1b 21 34 68 <br /> 2Ys g 12 16 28 54 234 !0 14 20 32 64 <br /> 3 8 12 16 ` 25 52 3 9 '14 19 30 60 <br /> 3�16 I11CI1 HOIlS �/e�inth Floles <br /> Perboration Pipe Diameter(Inches) PerforaRion Pipe Diam�er(inches) <br /> Spadng(Feet) 1 13d� 1'!Ri 2 3 Spacing(Fert) 1 1l�i 11'i 2 3 <br /> 2 12 18 26 �!6 87 2 21 ' 33 44 74 1'49 <br /> 2S�i 12 i7 24 4Q 80 23'4 Z0 30 41 69 435 <br /> 3 12 y6 22 37 75 3 20` 29 ' 38 64 128 <br /> 7• Tota!Number of PerJoratior� equals the Number of Perforotio►u per l.nterot (Line 6)multiptied by the Number of <br /> Perforated laterois (Line 1). <br /> 17 Perf.Per Laterat X �Number of Perf. Lat,erals = 51 Total Number of Perf. <br /> Calcutate the Square Feet per Perjorotion <br /> 8. Bed Area = Bed Width(ft)X Bed Length(ft) <br /> 10 tt x 50 ft = 500 ftz <br /> 9. Sc�uare Foot per Perforation =8ed Area (Line 8)divided by the Total Number of Perforadons (Line 7). <br /> 500 ftZ 1 51 pertorations = 9.80 ft2lperforations <br /> Recommended value is 410 ft2 per perforation. Does�t apply to At-Grades <br /> CONT'INUED ON NEXI'PAGE <br />