Under the Texas Water Code, §11.329, holders of water rights that are administered by the Rio Grande watermaster shall reimburse the commission for the expenses of the wastermaster operation. An assessment account shall be established for each water right, or for each authorization thereunder by category of use. The commission shall not assess costs against a holder of a non-priority hydroelectric right that owns or operates privately-owned facilities that collectively have a capacity of less than two megawatts. The assessment for each account shall be the sum of a uniform base charge and, as applicable, a use fee and a storage fee. Following a public meeting, the commission shall issue an order approving the assessment income needed for the Rio Grande Watermaster for the next fiscal year. The order shall also specify the base charge per account and the reinstatement fee for delinquent assessment payment. At least 30 days prior to the commission holding such a meeting, the executive director shall file with the commission a copy of the proposed budget.