NM CID GF-4 Practice Questions - New Mexico CID GF-4 Drainage Or Flood Control Systems Contractor Examination Exam

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A long concrete box culvert under a fill is flowing full with a high tailwater. Which statement correctly describes the hydraulic control?

The culvert is under inlet control, so barrel roughness and length do not affect headwater Culverts never operate under outlet control if the inlet is submerged The culvert is under outlet control, so barrel friction, length, slope, and tailwater all affect headwater Outlet control occurs only in corrugated pipe, never in concrete boxes

Correct Answer:

The culvert is under outlet control, so barrel friction, length, slope, and tailwater all affect headwater

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