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, , <br /> CURTAIN DRAIN CROSS-SECTION <br /> no scale <br /> finished grade <br /> //N.\ !//��✓l /�../!,.!� �. '� �+� � \ \ � � \ \ � \ '� � ` l'//�`�`1// �,��`/�� <br /> � low permeability site soils � % � <br /> � � ��� � � � � � .� � � � � 1to2feet <br /> �f p.'� .' !• . Q . Q . • �i •� „�',�, <br /> ` � . , b �. . � , . �a � <br /> �', , � <br /> � . L3 Q � ° r� ra � . - � ;. <br /> a �. e '� A . p �f <br /> /� A � � \ <br /> . . � . ` '� � b. � • � • � �•� � V . <br /> ��, D washed crushed rock ,� ' as steep as practicable <br /> �' D drainage backfill � �� and safe <br /> depth as required � � <br /> �,r ,� � � $ � � • � P *`� <br /> � <br /> �� . • • , . v .d �r <br /> . <br /> .� � a . � � . �`1 <br /> > 6 .4 � �• Q . . �d r <br /> f . ° -v �' , <br /> ` P ' +Q <br /> . . i � • ` ,� • • � . �p ` � . <br /> . - � r :i Y �+' . . . . <br /> r� <br /> :# <br /> \ ' a .� •� . �. drain pipe <br /> �' a S. . �.b ��i <br /> � . �• � <br /> �"l�.�.� �//�� ✓,�,�"^/�+ ` <br /> � 1 ft. min.- � � <br /> SUBDRAIN PIPE: DRAtNAGE ROCK BACKFILL <br /> MATERIAL <br /> 4" minimum dia. perforated or slotted <br /> concrete, metal, or rigid plastic pipe. Drainage material such as a 1 '/Z inch <br /> Pipe should be tight jointed and sloped <br /> to drain (2% min.), with clean-outs. minus, well graded, clean (washed) <br /> crushed rock product, or other material <br /> as approved by the engineer, should be <br /> Slotted pipe should have 1/8" max.width used. <br /> slots. Perforated pipe should have 3/16" <br /> to 3/8" holes. Slots should lie in lower <br /> one-half of the pipe, with the Jower <br /> quarter segment solid for water flow. <br /> 114-3 May 2011 <br /> , Geological Services <br /> Figure 5 <br />