Neb. Rev. Stat. § 46-206: Neb. Rev. Stat. § 46-206

The water appropriated from a river or stream shall not be turned or permitted to run into the waters or channel of any other river or stream than that from which it is taken or appropriated, unless such stream exceeds in width one hundred feet, in which event not more than seventy-five percent of the regular flow shall be taken and any such taking shall be subject to the provisions of section 46-289 .