Neb. Rev. Stat. § 31-352

In order to effect the drainage of the district, the board is authorized to clean out and remove all obstructions from the bed of any stream, creek, bayou, lagoon or other watercourse in the district; to straighten or shorten and deepen or widen the course of any stream or to abandon the bed of any stream and construct a new channel therefor; and to fill up any channel, or part of a channel, of any stream, creek, bayou, or other watercourse, in order to turn the direction of the volume of water, or to concentrate the water, so as to deepen and form a main channel.