design flood level

例句：

1. 1. Theengineer designed the flood level for the city's infrastructure.
   工程师为城市的基础设施设计了洪水水位。
2. 2. The construction of the new bridgewas based on the design flood level.
   新桥梁的建设基于设计洪水水平。
3. 3. The government hasraised the design flood level to protect againstfuture flooding events.
   政府已提高设计洪水水平以抵御未来的洪水事件。