The distribution of water on the planet

In the Middle Ages migrated to the north of the Po delta, the Fly and the Po Po's service would, in 1065, the main river branches.
Ercole II d'Este in 1559 began the Great Reclamation, which is the arrangement of the marshland between Copparo, Codicote and Mesola.



the problems of land
1) lowering the soil level: SUBSIDENCE

2) CARS salt wedge that is the entrance of salt water
Cause:
- lowering of the whole than Sea
- Rising sea levels
- Lowering of the beds of the delta branches to reduce sediment deposits
- phenomena increasingly frequent dry rivers

3) urbanization

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