The 'Box culvert' for drainage under an embankment is a:
Choose the correct answer
Circular pipe under the road
Rectangular RC box spanning wide waterways under embankments — designed for overburden + live loads + internal water pressure
Steel arch spanning over a stream
Open channel through the embankment
Correct Answer
B. Rectangular RC box spanning wide waterways under embankments — designed for overburden + live loads + internal water pressure
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Box culvert: rectangular RC box (typically one or multi-cell) placed under road or railway embankment for drainage. Design: (1) Dead load of embankment on top slab; (2) Live load (wheel loads reduced by depth of cover, Boussinesq); (3) Lateral earth pressure on walls; (4) Water pressure inside (designed for full flow). Preferred for: wide waterways (span > 6 m becomes uneconomical compared to pipe culvert). IS 4880, IRC:SP:13 cover culvert design.
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