A district may be created under this chapter to provide, in or adjacent to its boundaries, for:
(1) the improvement, preservation, and conservation of inland and coastal water for navigation;
(2) the control and distribution of storm water and floodwater of rivers and streams in aid of navigation; and
(3) any other purposes necessary or incidental to the navigation of inland and coastal water or in aid of these purposes, as stated in Article XVI, Section 59, of the Texas Constitution.