Unpolluted water in excess of two thousand (2,000) gallons per day, including, but not limited to, cooling water, process water or blowdown from cooling towers or evaporative coolers shall not be discharged through direct or indirect connection to the sewer unless specifically authorized by the City. The City may approve the discharge of such water only when no reasonable alternative method of disposal and/or treatment is available. If authorization is granted for the discharge of such waters into the sewer, an indirect discharge permit may be issued. The user shall pay all applicable charges and fees and meet such other conditions as required by the City. (1952 Code § 8-14-04.04)