Tex. Spec. Dist. Local Laws Code § 9009.103

The district may purchase, construct, acquire, own, operate, maintain, improve, or extend inside and outside the district canals, waterways, bulkheads, docks, and any other improvements or facilities necessary or convenient to accomplish the navigation purposes of the district under Chapters 60 and 62, Water Code, and authorized by Section 59, Article XVI, Texas Constitution.