Miss. Code § 51-3-13
Use of waters of the state shall not constitute absolute ownership or absolute rights of use of such waters, but such waters shall remain subject to the principle of beneficial use. It shall be the duty of the board to approve all applications made in such form as shall meet the requirements of this chapter and such rules and regulations as shall be promulgated by the board and which contemplate the utilization of water for beneficial purposes, within reasonable limitations, provided the proposed use does not prejudicially and unreasonably affect the public interest. If it is determined that the proposed use of the water sought to be permitted is not for beneficial purposes, is not consistent with standards established by the commission, or is detrimental to the public interest, it shall be the duty of the board to enter an order rejecting such application or requiring its modification.
Miss. Code § 51-3-13