Short answer. Yes. Article 674 first requires you to build your roof so rain water falls on your own land or a public place, not your neighbor's. Even where it does fall on your own land, you must still collect it so it does not cause damage to the adjacent land or tenement.
What the law says
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.
Civil Code, Article 674 — Rain Water From Roofs. Read the full provision →
The first obligation: keep the water off the neighbor's land entirely
Article 674 opens with the primary rule: a building owner 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. This applies even though the adjacent land may belong to two or more persons, one of whom is the owner of the roof — even partial co-ownership of the neighboring land does not excuse letting rainwater drain onto it. The starting design obligation is to direct roof water away from the neighbor altogether.
A second, independent duty once the water is on your own land
Complying with the first rule does not end the owner's obligations. The article goes further: 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. Water that legitimately falls within your own property boundary can still pool, channel, or flow in ways that damage your neighbor's land if you do nothing to manage it — Article 674 does not let ownership of the point of impact excuse the consequences of letting that water migrate and cause harm next door.
Why the rule covers both stages
Rainwater does not respect property lines once it starts moving across land, and simply directing it away from your neighbor's roofline is not enough if you then let it run downhill, seep, or accumulate in a way that reaches and damages his property anyway. By imposing two separate obligations — first on where the water initially falls, and second on how it is managed afterward even on your own land — Article 674 closes the gap between technically complying with the first rule and actually preventing harm to the adjoining property, which is the real concern behind both requirements. A building owner who satisfies the first obligation but ignores the second has not fully complied with what the article requires.