Comparing the usage of duckbill valve with multi-port heads in Fengpu outfall in Shanghai it is concluded that whether or not duckbill valves shall be used in a sea outfall depends on the comprehensive analysis of the specific engineering conditions.

• 结合上海市奉浦排海工程，对使用鸭嘴阀与多喷口喷头进行了比较，认为鸭嘴阀在排海工程中的使用与否应根据具体工程综合分析决定。