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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 /> Inlet Pipe to Next � �/2 Male Well <br /> Dron Box Adapter <br /> 12" Soll BackliU <br /> :> . <br /> Corrugated Tubing Covered <br /> wilh Geotexlile F�bri <br /> Drop E3ox I � <br /> r Trench Longth • up to 100 Fee1 <br /> Ovorfill to Allow ��S: 1. Bottom o( trenci� must be level. Top <br /> tor Settling ot tubing must bo Ievei. <br /> � Soil �2° ol Soil 2. Scarify tronch boltom and sidewalls <br /> � Backfill � Backlill el leflst 12 inct�es aboro trencti bottom <br /> 24" ' � <br /> � ' to exposo notural soil. <br /> � , <br /> ' ' 12" <br /> �-- - '—�. 3. For proprialory products consult <br /> � Holes Located manutacturors perlormonce crJteria. <br /> 24 at 4 and <br /> 8 O'Clock <br /> Figure D-33 <br />