The district has the functions, powers, authority, rights, and duties which will permit the accomplishment of the purposes for which it was created, including the investigation and, in case a plan for improvements is adopted, the construction, maintenance, and operation of necessary improvements, plants, works, and facilities, and the acquisition of water rights and all other properties, land, tenements, materials, borrow and waste ground, easements, rights-of-way, and everything considered necessary, incident, or helpful to accomplish by any practicable mechanical means any one or more of the objects authorized for the district, subject only to the restrictions imposed by the Constitutions of Texas or the United States. A district also may acquire property deemed necessary for the extension or enlargement of the plant, works, improvements, or service of the district.