An old culvert runs under this road.
The road will be closed due to culvert construction.
underdrainage; subsurface drainage
Standard kanji spelling.
Mixed kanji-kana spelling; less common but still used.
Compound of 暗 (dark, hidden) and 渠 (ditch, channel). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning of a covered waterway.