Landscape · L-J7N49

Field Underdrain - Natural Grass

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A high-density polyethylene N-12 perforated field underdrain sits within a compacted trench bottom designed per section 312000, with loose material removed and the trench compacted to 95 percent dry density. The pipe is surrounded by a coarse sand layer specified under section 3100, providing a 3-inch minimum bedding depth below and a 3-inch layer above, maintaining 4 inches of side clearance. An athletic field rootzone mix per section 329120 extends 9 inches deep above the sand, providing a 12-inch minimum total depth below the drill-seeded turf surface.

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