Miss. Code § 51-13-129
The board of supervisors of each county becoming a member of the Tombigbee River Valley Water Management District shall pay or cause to be paid to the depository of said district a sum equal to one-half (1/2) mill on all of the taxable property within the Tombigbee Watershed area of the said county, beginning with the tax assessment for the calendar year 1964; and such payments shall be made and continued as long as there remains unpaid and outstanding any bonded indebtedness or obligations created by the district so created under this article. Any such board of supervisors shall provide the district the sum equal to the one-half (1/2) mill levy by appropriation of an equivalent sum from the general fund of the county.
Miss. Code § 51-13-129