What is Aquae Immittendae?

Legal Definition
Civil law. The name of a servitude, which frequently occurs among neighbors. It is the right which the owner of a house, built in such a manner as to be surrounded with other buildings, so that it has no outlet for its waters, has, to cast water out of his windows on his neighbor's roof court or soil. Lalaure, Des. Serv. 23.
-- Bouviers Law Dictionary
Legal Definition
The easement of dripping water.
-- Ballentine's Law Dictionary