| (1) | A holder in control of operations must compile a water balance that— |
| (a) | is based on data collected from installed flow measurement devices, to measure the amount of water abstracted, received, consumed, transported or discharged as required, in order to ensure that the flow of at least 90% of the total water in use is measured, with the remaining 10% or less being calculated; |
| (b) | incorporates accurate values determined from suitable measurement or modelling for rainfall, runoff, seepage and evaporation from the facilities where these components of the water balance may potentially come into play; |
| (c) | accounts for seasonal changes for the flow values affected by rainfall or evaporation; |
| (d) | is computerised so that it can be updated at least monthly with measured and modelled data; |
| (e) | accounts for and reflects the possible interconnections between the operations, the surface and ground water resource and how these may be avoided and mitigated; |
| (f) | is used by the holder to generate water management reports to assist in the management of the impact of the operations on the water resource; and |
| (g) | is submitted to the department responsible for water affairs on a bi-annual basis together with the monitoring data, unless stipulated otherwise in a water use licence. |
| (2) | A holder in control of operations must ensure that measuring devices used to develop the water balance are easily accessible, properly maintained and in good working order, based on a verifiable programme of checking, calibration, or renewal of measuring devices. |
[Regulation 121 inserted by section 2 of Notice No. R. 466 dated 3 June 2015]
