Tex. Water Code § 51.443

After bonds, other than preliminary bonds or notes, are voted by a district, the board may declare an existing emergency with relation to money being unavailable to pay for engineering work, purchase of land, rights-of-way, construction sites, construction work, and legal and other necessary expenses and may issue interim bonds on the faith and credit of the district in the manner provided in Sections 51.444-51.449 of this code to pay these expenses.