The conversation between human and AI assistant.
[|Human|] how can we prevent the best river floods?
[|AI|] Prominent levee systems have been built as a water conservation and flood control project. 
The Mississippi River and Sacramento River in the United States, and the Po, Rhine, Meuse River, RhÃ´ne, Loire, Vistula, the delta formed by the Rhine, Maas/Meuse and Scheldt in the Netherlands and the Danube in Europe. The Mississippi levee system represents one of the largest such systems found anywhere in the world
[|Human|] 
how can we prevent the best river floods?