[ULPIANUS libro quinquagesimo tertio ad edictum. ] §39.3.8.prIn concedendo iure aquae ducendae non tantum eorum, in quorum loco aqua oritur, uerum eorum etiam, ad quos eius aquae usus pertinet, uoluntas exquiritur, id est eorum, quibus seruitus aquae debebatur, nec immerito: cum enim minuitur ius eorum, consequens fuit exquiri, an consentiant.
[ULPIANUS libro quinquagesimo tertio ad edictum.] In granting the right to conduct water, the consent is required not only of those on whose land the water rises, but also of those to whom the use of that water belongs, that is, of those to whom a servitude of water was owed; and not without reason: for since their right is diminished, it was a natural consequence that it should be inquired whether they consent.
et generaliter siue in corpore siue in iure loci, ubi aqua oritur, uel in ipsa aqua habeat quis ius, uoluntatem eius esse spectandam placet.
And generally, whether someone has a right in the physical body or in the legal right of the place where the water rises, or in the water itself, it is accepted that his consent must be regarded.