Raining in Portugal

Chuva: Bombeiros de Lisboa acorrem a cem chamadas por inundações e entupimentos. Finally, it is raining in Portugal. But again there is a problem, why are there always problems. The rain can't go anywhere, because there is no decent sewing system. Al the water goes immediate to places where it can go the quickest (we al learned that in school, isn't it).
But it needed to rain, it was to dry. But lets hope that it will rain for a long time, and slowly, not hard, so the rain goes in the ground and not washed away on concrete.