内ない水すい氾はん濫らん

noun

inland flooding; flooding inside a levee

Technical term used in disaster prevention and civil engineering. Refers to flooding caused by heavy rain overwhelming drainage systems or surface runoff, as opposed to river overflow (外水氾濫).

See also: 外水氾濫

• 都と市し部ぶでは内ない水すい氾はん濫らんが増ふえている。

  Inland flooding is increasing in urban areas.

• 内ない水すい氾はん濫らんは排はい水すい能のう力りょくを超こえた雨あめによって起おこる。

  Inland flooding occurs when rainfall exceeds drainage capacity.