(a) If any power granted to the authority by this chapter overlaps or conflicts with any power of the Guadalupe-Blanco River Authority, the power granted to the Guadalupe-Blanco River Authority supersedes the power granted to the authority by this chapter, unless the Guadalupe-Blanco River Authority consents to the authority's exercise of the power.
(b) No provision of this chapter divests any person of any vested:
(1) riparian right;
(2) right derived under an existing permit for the appropriation and use of public waters issued by the commission; or
(3) right derived under any certified filing with the commission.