The storms caused by typhoons take place in summer or autumn seasons that existing hydraulic facilities often cannot meet the demand and urban inundation results.

• 因之，有关洪水灾害的问题亦日趋重要，尤其当雨季来临，特别是台风带来之豪雨及夏季午后之暴雨，若所挟带之降雨强度超过现有水利设施之设计容量时，而会造成淹水水患。