design discharge of canal

例句：

1. 1.The engineer designed a new drainage system for the construction site.
   工程师为工地设计了一种新的排水系统。
2. 2. The city government is planning to improve the drainage system in the downtown area.
   市政府正在计划改善市中心的排水系统。
3. 3. The design discharge of the canal was carefully planned to ensure efficient water flow.
   运河的设计排水被仔细规划，以确保水流高效。