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

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A short, smooth concrete culvert on a steep slope with a low tailwater typically operates under inlet control. That means capacity is governed mainly by:

Barrel length, Manning n, and downstream tailwater Inlet geometry and headwater depth at the entrance The color of the headwall concrete Whether the contractor used a trench box during laying

Correct Answer:

Inlet geometry and headwater depth at the entrance

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