Texas Local Government Code - LOC GOV'T § 561.003. Plans and Programs

(a) The commissioners court of a county may contract with the federal soil conservation service, a state soil conservation district, the state extension service, a conservation and reclamation district, a drainage district, a water control and improvement district, a navigation district, a flood control district, a levee improvement district, or a municipality as provided by Section 256.006, Transportation Code, for the purpose of carrying out plans and programs for flood control and soil conservation. The contract may provide that payments due under the contract are payable from and secured by a pledge of any revenue of the county or the county's ad valorem taxes or a combination of those revenues and taxes.

(b) The contract may divide or delegate among the contracting parties the responsibility and cost of carrying out the plans and programs and may be for a specified term of years or may terminate when the plans or programs have been accomplished.

(c) The contract may provide that, if the contracting agency, district, or municipality issues bonds payable from and secured by revenues derived from the contract, the contract will continue in effect until the bonds, or any refunding bonds issued in their place, are fully paid.