En ce qui concerne "réhabilitation", Termium indique:Oui, réhabilitation me semble adéquat.
In more general terms, it seems that the Bureau of Reclamation is, in part, responsible for the management of the watershed. Under the umbrella of watershed management you can reclaim land for cultivation, divert it for hydro-electric projects, etc. The following terms seem to encompass that type of activity. But are you wishing to translate the term "Bureau of Reclamation" itself?Il reste à traduire: Bureau of Reclamation (qui concerne en fait des aménagements hydrauliques/hydroélectriques)