Civil · C-G6KKQ

Detention Basin Cross Section with Underground Chambers and Pond Liner

Materials

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This detention basin section shows underground stormwater storage chambers bedded within free-draining angular washed stone having a particle size from three-quarters of an inch to two inches and compacted to ninety-five percent standard density per AASHTO T99. The stone bed is enclosed by a thirty-mil PVC pond liner along the bottom and sides, topped with Mirafi 180N filter fabric over the gravel storage area. Four-inch high-density polyethylene perforated underdrain pipes run along the bottom edges of the basin. Pavement sits above the upper gravel layer, with specific elevations indicated for the bottom of gravel at 4285.77, bottom of chambers at 4286.52, top of chambers at 4291.52, and top of gravel at 4292.52.

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