Landscape · L-QDGXX

Swale Drainage Detail with Concrete Bench and Handrail

Materials

Elements

Columns Railings / Guards Canopies Arches Drainage Site / Paving

About this detail

A drainage swale is flanked by adjacent concrete pavement and a wood-topped concrete bench. The subgrade consists of ninety-five percent compacted material or four inches of crushed surfacing top course per WSDOT standards. A perforated pipe wrapped in drain rock is positioned beneath the swale for subsurface drainage, augmented by optional boulder armoring and a brass cow tongue. An adjacent shelter column and downsport interface with the concrete foundation and handrail with a midrail. Sloped grading directs surface water toward the swale and drain inlet.

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