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Water quality attributes for Health Rivers: Wai ora Plan Change (Process…
Water quality attributes for Health Rivers:
Wai ora Plan Change
Process of changing the
Waikato Regional Plan
to help protect and restore the
health of the Waikato and Waipa Rivers
Aim
Reduce, over time
sediment
bacteria and nutrients
Follows National Objective Framework approach
to setting FW objectives
Set out in NPS-FM
Steps include:
Describing FMUs
Identifying values
defining attributes
Definition of attributes is a critical step
to development of objectives and mangt
of values
Because provide measurable characteristics
of FW, including:
physical
Chemical
Biological
E coli, TN, TP, DO etc
setting objectives
F V A O
MCI
There is an on-going national discussion on the status of macroinvertebrate indices such as
MCI (Macroinvertebrate Community Index) and their applicability as attributes under the
NOF (Clapcott & Goodwin 2014). Indices such as MCI provide good indicators of land use
impacts, but it is very difficult to link MCI to changes in concentrations of the four
contaminants in a way that allows confidence in its use in limit setting at this time. For this
reason, MCI is not recommended as a numerical attribute in Healthy Rivers: Wai Ora.