The Director of Public Works shall require significant users to provide results of periodic measurements of discharges, including chemical analyses and flow. The Director may require a monitoring facility to be furnished and operated at user’s expense. All dischargers making periodic measurements shall furnish and install at an appropriate location, a calibrated flume, weir, flow meter, or similar device suitable to measure flow rate and total volume approved by the Director. In lieu of wastewater flow measurement, the Director may accept records of water usage, and may adjust the flow volumes by suitable factors to determine peak and average flow rates for the specific industrial wastewater discharge. City Code, 1976/83, art. 25, §7(b)(1) Ord. 84-129 Ord. 91-775