drainage perimeter

例句：

1. 1. The city's drainage system is designed to handle theexcess water from the rainy season.
   城市的排水系统设计用来处理雨季过多的雨水。
2. 2.The construction of the new road will requirea thorough drainage perimeter assessment.
   新道路的建设需要彻底的排水边界评估。
3. 3. The farmerscarefully planned their drainage perimeter to preventflooding during heavy rainfall.
   农民们仔细规划了他们的排水边界，以防止大雨期间的洪水。