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, . . . <br /> D-37 <br /> . O It is easy to lay out. <br /> O Material is consistently sized. <br /> Disadvantages of a Gravelless System <br /> O No sizing flexibility exists. <br /> O Potential problems can occur in areas of fine sand. <br /> O Cost of materials is dependent on manufacturers. . <br /> Gravelless Pipe System <br /> Gravelless pipe is a corrugated pipe used in place of gravel for a trench <br /> system. This pipe typically has an inside diameter of 8-10 inches. � <br /> The corrugations are usually 1/2 inch, with 3/4-inch separations. <br /> GRAVELLESS TRENCH CONSTRUCTION DETAILS <br /> 1 1/2" Inspection <br /> Iniei Pipe lo Next � �/2 Male Well <br /> Drop Box Adapler <br /> — - �L <br /> 12" Soll Backlill <br /> :> , <br /> Corrugated Tubing Covered <br /> with Geotexlile F�bri <br /> Drop E3ox I <br /> r Trench Length m up to 100 Feet <br /> Ovortill to Allow Np7ES: 1. Bottom ot lrencf� must be level. T�p <br /> for Settling of tubi�g must be level. <br /> � Soil 12" of Soil 2. Scarily trQnch bottom and sidewalls <br /> : Backfill � Backfill at lenst 12 i�►clies above trencl� boltom <br /> 24" ; � <br /> � � to exposo natural soil. <br /> ' ' 12" <br /> '.l�i`-_ . '� 3. For propriclnry producls consult <br /> � Holes Located manufacturers perlormance crileria. <br /> 24 at 4 and <br /> 8 O'Clock <br /> Figure D-33 <br />