[PAULUS libro quadragensimo nono ad edictum. ] §39.3.9.prIn diem addicto praedio et emptoris et uenditoris uoluntas exquirenda est, ut, siue remanserit penes emptorem siue recesserit, certum sit uoluntate domini factam aquae cessionem.
[PAULUS libro quadragensimo nono ad edictum.] When an estate has been sold subject to a better offer by a certain day, the consent of both the buyer and the seller must be sought, so that, whether the estate remains with the buyer or reverts to the seller, it may be certain that the grant of the water was made with the consent of the owner.
§39.3.9.1Ideo autem uoluntas exigitur, ne dominus ignorans iniuriam accipiat: nullam enim potest uideri iniuriam accipere, qui semel uoluit.
Moreover, consent is required for this reason, lest the owner suffer an injury without his knowledge; for he who has once consented cannot be deemed to suffer any injury.
§39.3.9.2Non autem solius eius, ad quem ius aquae pertinebit, uoluntas exigitur in aquae cessione, sed etiam domini locorum, etsi dominus uti ea aqua non possit, quia reccidere ius solidum ad eum potest.
However, in the grant of water, the consent is required not only of him to whom the right to the water will belong, but also of the owner of the land, even if the owner cannot use that water, because the complete right can revert to him.