It is amazing how little a dry country like Spain does to manage rainwater. As a result, if it rains a lot, the streets are flooded and the water has nowhere to go. You would think it is not that hard to collect rainwater safely and effectively.
This is very different in the Northern European countries where it rains a lot, such as the Netherlands and Belgium. The municipalities not only attach great importance to water management, but they have various subsidy schemes for private individuals to make provisions.