Buried foul and surface water drainage pipe systems from gullies or above ground drainage stacks to the sewer connection or other outfall, defined by type of waste and materials; see Pipes in general see I.
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TwinWall Surface & Stormwater Drainage System
TwinWall is a cost effective pipe system
intended for use as a direct alternative to
all non-pressurised gravity drain systems
other than where Local Authority adoption
is necessary. Smaller diamet...
Below Ground Drainage Systems
Below ground drainage systems installation guide, covering the planning, transportation, storage and installtion details for OsmaDrain, UltraRib and TwinWall systems.