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

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A combination curb-and-grate inlet is selected at a sag on an urban street. What is the principal hydraulic reason for using both openings together?

The grate intercepts gutter flow while the curb opening continues to take water if debris blinds the grate The curb opening is only decorative and the grate carries the entire design storm Combination inlets are used only on steep grades and never in sags The grate is intended only for bicycle safety and does not convey stormwater

Correct Answer:

The grate intercepts gutter flow while the curb opening continues to take water if debris blinds the grate

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