flood control measures; flood prevention measures
Refers to policies, infrastructure, or actions taken to prevent or mitigate flood damage.
The city announced new flood control measures.
Embankments were reinforced as a flood prevention measure.
Often used interchangeably, but 洪水対策 specifically targets flooding caused by overflowing rivers or heavy rain, while 水害対策 is a broader term covering all types of water-related disasters.
治水 refers to river management and flood control as a field of engineering or public works, whereas 水害対策 focuses on concrete measures and policies.
Compound of 水害 (flood damage) and 対策 (countermeasure).