Step 10: Finish the job & backfill

Run flexible pipe
Photo: Smith-Baer
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If you're going to run flexible pipe, first glue a 3x4-inch reducer coupling to the end of the rigid pipe in the trench. Then, slip the flexible pipe over the reducer and secure it with a stainless-steel pipe clamp. At the very end of the trench, dig a wide, shallow hole (approximately 16-inches-deep x 36 inch-diameter) and line it with flat rocks or a 4-inch layer of gravel. Lay down the pipe end on this rocky bed and cover it with more rocks or several inches of gravel.

In Step 3, you put down wide pieces of cardboard beside the proposed trench. Finish by backfilling the trenches, using a garden hoe to pull dirt off the cardboard and into the trench.

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    Tools List

    • 16-foot tape measure
      Tape measure
    • flat blade shovel
      Shovel, used to dig trench
    • two-foot level
      Level, used to check drainpipe for proper slope
    • sledge hammer
      Small sledgehammer, used to pound in stakes
    • hand saw
      Handsaw, hacksaw or 12-inch power miter saw, used to cut the PVC pipe

    Shopping List

    1. 4-INCH-DIAMETER PVC AND ASSORTED FITTINGS

    2. 4-INCH-DIAMETER FLEXIBLE PLASTIC DRAIN PIPE

    3. PVC PRIMER AND CEMENT

    used to join together PVC pipe and fittings



    4. WOODEN STAKES AND MASON'S STRING

    5. WHITE FLOUR IN METAL CAN

    sprinkled onto ground to indicate trench location



    6. CARDBOARD SHEETS

    used to temporarily hold soil dug from trench