11.2 The occupier is responsible for the supply, installation and maintenance of any meter required by the Council for the measurement of the rate or quantity of discharge. 11.3 Any flow meter is subject to the approval of the Council, but remains the property of the occupier. 11.4 Measurement of flow must be carried out by or on behalf of the occupier in accordance with the following British Standards or their replacements: BS 3680: Part 11A; BS 3680: Part 11B; and BS 5728: Part 3. 11.5 Records of flow and/or volume must be made available to the Council without undue delay, on request by the Council. 11.6 Flow meters must be readily accessible for reading and maintenance, and as close as practicable to the point of discharge. 11.7 The occupier must ensure the flow metering equipment and instrumentation is calibrated upon installation and at least once a year thereafter, and must ensure that metering equipment and instrumentation is accurate to within ±10% of its reading. Calibration is to be undertaken in accordance with New Zealand Standard 10012: Part 1, or its replacement. Each calibration result must be independently certified, and a copy of that certification must be submitted to the Council. 11.8 Should any flow meter be found to be inaccurate, the Council may adjust any fees levied for the relevant discharge according to the results of the calibration tests, and backdate those fees for a period at the discretion of the Council not exceeding 12 months. 12 Estimating Discharge 12.1 Where a discharge is not measured by a flow meter or similar apparatus, the Council may estimate the discharge on the basis of: (a) A percentage of the water supplied to the premises; or (b) The characteristics of the discharge measured at a previous time during similar operating conditions; or (c) Characteristics of the discharge measured during a period immediately preceding the charging period. 12.2 Should any flow meter be out of repair, or cease to register, or be removed, the Council may estimate the discharge for the period since the previous reading of that flow meter based on: (a) the average of the previous 4 (if available) billing periods charged to the occupier; or (b) any other factors for the purpose of arriving at a reasonable estimate when there is reasonable evidence the average of the previous 4 billing periods would be an unreasonable estimate of the discharge; (c) and the occupier must pay the fee determined according to such estimate. 12.3 Where a meter has been tampered with, the Council may declare the meter reading void and estimate the discharge as provided above. 13 Monitoring 13.1 The Council may require the occupier to monitor the discharge of the tradewaste under the terms of its consent. For the avoidance of doubt, it is an offence against this Bylaw to fail to monitor discharge when required to do so by the Council. Page 10