Civil · C-YJSMS

Storm Drain Trench Detail

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A storm drain pipe is bedded on four inches of float rock below the bottom of the pipe within a trench width of pipe outer diameter plus sixteen inches. Float rock backfill surrounds the pipe and extends six inches above the crown, conforming to specified grading requirements. A permeable non-woven filter fabric, such as Mirafi 140 NC or equivalent, is placed between the float rock and subsequent backfill, wrapped up the trench sides by six inches. Final backfill consists of imported or native material free of organics and deleterious matter, compacted to a minimum ninety percent maximum density in six-inch lifts. Paved areas require a twelve-inch minimum depth of cover with pavement grade set one-eighth inch above the top of the grate.

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