Cal. Water Code § 8709

Any use of any such land, right of way, or easement in violation of the preceding section, whether for cultivation, planting of crops or trees, storage or disposal of material, or other encroachment upon, or use of such land, right of way, or easement which does or may interfere with or obstruct such operation or maintenance, constitutes a public nuisance, and the board may commence and maintain a suit in the name of the people of the State for the prevention or abatement of such nuisance.