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� � OSTP Pressure Distribution <br /> UNIVERSITY <br /> Minnesota Pollution Design Worksheet OF MINNESOTA � <br /> Contro!Agency ��.\�, <br /> 1. Select Number of Perforated Laterals in system/zone: � Geotextile <br /> �p0(�jp0�0'CqpO'Oepl'Opp�?papOe Minimum�D¢po0'� O�pO'pRp� <br /> (2 feet is minimum ond 3 feet is maximum spacing) oc !<'perforations spaced 3'apart c�oc� 2"of rockc�o �� <br /> 2. Select Perforotion Spacing: 3.0 ft � � � � � o o_ 1z` <br /> 0 o b�o'�o�o`�o�c�� '�°o._ �cY o`�o"doo°`�'cT�o"�yo" <br /> DoC�eDo�00Oa,7o�0��DoCtDoORc�e 9"of rock�o�DodeDa�Da�Rq��O���y�D_o��q�O� <br /> o°�o'qoo`�pooqoo�o"=� iio�o°� o'����So'�o'�o <br /> _1 <br /> 3. Select Perforation Diameter Size 7/32 inch <br /> Perforation sizing:'/e"to'/." <br /> Perforation s acin :2'to 3' <br /> 4. Length of Loterals =Media Bed Length -2 Feet. Perforation con not be c(oser then 1 foot from edge. <br /> 63 - 2ft = 61 ft <br /> 5• Determine the Number of Perfor4tion Spaces. Divide the Length of Laterots (Line 4)by the Perforation Spacing (Line 2)and <br /> round down to the nearest whole number. <br /> Number of Perforation Spoces = 61 ft .- C�ft = 20 Spaces <br /> 6. Number of Perforations per Loterol is equal to 1.0 ptus the tJumber of PerJorotion Spoces (Line 5). <br /> Perforations Per Loterol = 20 Spaces + 1 = 21 Perfs. Per Lateral <br /> Check Tab(e 1 to verify the number of perforations per(atera(guarantees less than o 10�discharge voriation. The va(ue is doubte if <br /> the a center manifold is used. <br /> �• Total Number of Perforotions equals the Number of Perforotions per Lotero( (Line 6)muttiplied by the Number of <br /> Perforated Laterals (Line 1). <br /> 21 Perf. Per Laterat X �Number of Perf. Laterals = 63 Total Number of Perf. <br /> 8. Calculate the Square Feet per Perforation. Recommended value is 4-10 ft z per perforation. �- <br /> PMaatlm DKchuge(GPM) <br /> Does not app(y to At-Grodes p�„an�,�;am«�, <br /> Mwd(fq <br /> Bed Area = Bed Width(ft)X Bed Length (ft) I '�e '�,. '��� '�. <br /> 1.0' 0.18 0.41 0.56 0.74 <br /> 10 ft x 63 ft = 630 ftz � �.5 o.z2 o.s, 0.69 0.9 <br /> 2,0° 0.26 0.59 0.80 1.04 <br /> 2.5 0.29 0.65 0.89 1.17 <br /> Square Foot per Perforation =Bed Area divided by the Tota(Number of Perforations (Line 7). 3.0 0.3: 0.�2 o.9a ,.28 <br /> 4.0 0.37 0.6J 1.13 1.07 <br /> S.0` p,41 0.93 1.26 /.65 <br /> 630 ftZ � 63 perforations = 10.0 ftZ/perforations „�� ��4�^�hand3/76inchpertara[iwnon <br /> d�,e��ir�gs <br /> 9. SelectMinimumAverogeHeod: 1.0 ft 7/8inchpeAoraciasondwNlingsandfor � <br /> I 2/ee[ other erablishments <br /> 1/4 inc�aM 3f 16 inch pefaa[io�s m MS75 �. <br /> �_feet �i8 Irxh perforations on MSTS <br /> 10. Select Perforation Dischorge (GPM)based on Table III: 0.56 GPM per Perforation <br /> 11. Determine required F(ow Rate by multip(ying the Total Number of Perforations (Line 7) by the Perforation Discharge (Line 10�. <br /> 63 Perforations X 0.56 GPM per Perforation = 36 GPM <br /> 12. Select Type of Manifold Connection (End or Center): �end ❑Center <br />