Landscape · L-JWQVC

Irrigation Pipe Trench and Backfill Detail

Materials

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The trench requires excavation to a specified depth with all rocks larger than one and one-half inches removed from the bottom and separated from the excavated material. A minimum two-inch layer of sand or rock-free soil is installed below and on all sides of the pipe. The assembly accommodates a PVC mainline and a PVC lateral line set eighteen inches deep for rotor and impact head installations with a twelve-inch vertical and two-inch horizontal separation. Control wires are taped together at a maximum of ten feet on center and installed under and to the side of the mainline pipe without being taped directly to it. The remainder of the trench uses native site soil for compacted backfill up to a minimum five-inch deep topsoil layer in lawn areas. No pressure main, irrigation pipe, or fittings shall be covered until the architect has inspected and approved the system, and pipe pulling is not permitted.

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