A 'box culvert' is preferred over a pipe culvert when:
Choose the correct answer
Only for very small drainage openings
Wide waterway is required, high embankment fill, or foundation bearing is poor — box distributes load better
Only in rocky terrain
Box culverts are always cheaper
Correct Answer
B. Wide waterway is required, high embankment fill, or foundation bearing is poor — box distributes load better
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Box culvert: rectangular RCC box structure. Preferred when: wide waterway needed (flow width > 1.5 m); skewed crossings; high fill height; poor foundation (box provides distributed base). Pipe culvert (circular): smaller openings, cheaper, easier to install, self-cleansing for sewage. Box culvert has better hydraulic capacity per unit opening area.
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