HRX6UNTF Practice Test

1Multiple ChoiceSelect all that apply

When installing a corrugated polyethylene (CPP) drainage pipe for a subsurface agricultural drain, which two installation practices are required by typical manufacturer and industry standards? (Choose two.)

A.Place the pipe on a prepared, smooth trench bottom free of sharp rocks or debris
B.Use a filter sock or appropriate graded envelope/aggregate around the pipe to limit fines migration
C.Backfill the pipe with native clay directly from the trench wall without compaction
D.Install the pipe with the perforations facing downward to capture surface runoff

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