http://sig.magrama.es/snczi/visor.html?herramienta=DPHZI

This is the kind of map we use often in urban planning. Flood risk due to river overflow can be really important in some cities, and this is not just the case in Spain, as they know so well in the Mississippi valley or, these days, in the Thames valley. The cartographic portal of the Spanish government for these risks can let you understand the amount of information that is available, but also the amount of work still to do to have a complete national map.