(a) The commissioners court or municipal authority may impose additional uses or restrictions on a street, alley, public highway, or other public ground necessary for the location, construction, or maintenance of a seawall, breakwater, levee, floodway, or drainway.
(b) The commissioners court or municipal authority may authorize an additional use of the seawall, breakwater, levee, floodway, or drainway if that use will not impair the efficiency of the seawall, breakwater, levee, floodway, or drainway.