Tex. Water Code § 49.509
(a) The Rio Grande Regional Water Authority annually at its January meeting shall calculate the current market value by using the average price per acre-foot of municipal use water after conversion from irrigation use water to municipal use water with a municipal priority of allocation under commission rules of the last three purchases involving:
(c) The Rio Grande Regional Water Authority shall make the calculation:
Added by Acts 2007, 80th Leg., R.S., Ch. 1430 (S.B. 3), Sec. 2.24, eff. September 1, 2007.