[POMPONIUS libro trigensimo quarto ad Sabinum. ] §43.12.2.prQuominus ex publico flumine ducatur aqua, nihil impedit (nisi imperator aut senatus uetet), si modo ea aqua in usu publico non erit: sed si aut nauigabile est aut ex eo aliud nauigabile fit, non permittitur id facere.
[POMPONIUS on Sabinus, Book 34] Nothing prevents water from being drawn from a public river (unless the emperor or the senate forbids it), provided that that water will not be in public use; but if either the river is navigable, or another river is made navigable from it, it is not permitted to do so.