Notwithstanding any rule or law to the contrary, no tax shall be due under §57-5-201 for any beer or ale that has been rendered unsalable and subsequently destroyed as a result of flooding occurring between May 1, 2010, and May 8, 2010. Any tax previously paid under §57-5-201 by the wholesaler on any such beer or ale that is unsalable and destroyed as a result of such flooding occurring between May 1, 2010, and May 8, 2010, shall be allowed as a credit against the tax levied by § 57-5-201 on the subsequent purchase of beer or ale by such wholesaler. However, this section shall not apply unless such flooding resulted in the destruction of at least fifty (50) barrels, or liquid volume equivalent, of beer or ale and satisfactory proof of such destruction is submitted to the department.