When should you backfill a trench?

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Prepare for the CR-21 Landscapes and Irrigation Test. Utilize flashcards and multiple-choice questions featuring hints and explanations. Get exam-ready!

Multiple Choice

When should you backfill a trench?

Explanation:
Backfill after flushing the pipe. Flushing clears debris—dirt, chips, and sediment—from joints and the interior of the line and lets you verify that everything is clean and holding pressure. If you backfill first, soil can fall into the pipe or around fittings, introducing contamination or clogging when you try to flush or test later. Once you’ve flushed and tested the system, backfill in stages and compact the soil to protect the piping and prevent future settlement.

Backfill after flushing the pipe. Flushing clears debris—dirt, chips, and sediment—from joints and the interior of the line and lets you verify that everything is clean and holding pressure. If you backfill first, soil can fall into the pipe or around fittings, introducing contamination or clogging when you try to flush or test later. Once you’ve flushed and tested the system, backfill in stages and compact the soil to protect the piping and prevent future settlement.

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