NM CID GF-5 Practice Questions - New Mexico CID GF-5 Recreation Areas Contractor Examination Exam

What is the main drainage purpose of a perforated pipe and free-draining backfill behind a park retaining wall?

To irrigate the wall stem To relieve hydrostatic pressure that would otherwise push the wall over or stain the face To serve as the wall's structural footing To replace the need for a geotechnical design

Correct Answer:

To relieve hydrostatic pressure that would otherwise push the wall over or stain the face

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