Article 674

The owner of a building shall be obliged to construct its roof or covering in such manner that the rain water shall fall on his own land or on a street or public place, and not on the land of his neighbor, even though the adjacent land may belong to two or more persons, one of whom is the owner of the roof. Even if it should fall on his own land, the owner shall be obliged to collect the water in such a way as not to cause damage to the adjacent land or tenement. (586a)