Septic info plus 1990 septic design

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1. Select nuntber of perforated laterals � 2 Select perforation spacing �`�, 3. Since perforations should not be placed closes thart 1 ft to the edge oE the rock layer(see p. E-14),subtract 2 h. froat the rodc layer length. � � ��•2ft = S� h. � 4. Determine the number of spaces between perforations, Divide the le�gth above by per�oration spacing and round E-17a � down to nearest whole nunlber. ► , LenBth Perf. sPacinB '_`L ft+ � � �m.a�.ee m+a+.�► � {t. : �gpa�g 7/32 1/4 ' (3) (2) �� as6� 014 �. 5. Number of perforations is equal to one plus the number of � � a perforation spaces . a�.o °o.��e i'ie � 1.13 1.�7 �`SPaG�S + 1 =,��prdt10I1S�idt2231 aU�s�lA foot d 1�ta��s. btJM 2.01Mt d hrd lar o11Nr�aWhha�aib 6. Multiply perforations per lateral by number of laterals to ' get total number of perforations. � E-176 �� rrr�.�.rr.r..r .�.�.r..�r.�..�. la�l a X p�ls/1a�ed'=�?p�Or3t10I1S. �1 y ,.��j° � .^,� �•• •••� �r.� 1 u�eh 7. Determine =equired flow rate by multiplying ' a i3 i� i6 number of perforations by flow per perforation � a o ii is 2u,3 (see page E-1� s.o ta ia 2z � X � _ `� a. gpm. .� E-15 � •�w��r r�w�e��ww� 8. If laterals are connected to header pipe as shown on page E- 15,select minimum required lateral diameter froat table on page E-17; enter table with perforation spaang and nuatber � �,•� � - of perforations per lateraL Select atininlum dianteter for �� perforated lateral=_inches. E-12 r-s..�-�- 9. If perforated lateral system is attached to manifold pipe near �""" the center, as on page E-12, perforated lateral length and � � �'''�� number of perforations per lateral will be approximately one ''°°"`""' � ` • �..�s half of that in step 8. Using these values, select aunimum -- �diameter for perforated lateral from page E-17 as �� ,� �"- � inches.