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Data layer consists of coastal water quality units to be included in the Regional Coastal Plan. The coastal water quality units include 1, Estuarine water, 2. degraded estuarine (including inner Firth of Thames and Whiritoa Lagoon) and, 3. open coast marine water.
The coastal water quality unit for the Inner Firth of Thames follows the regional boundary, but otherwise is a line between Orere Point and the southernmost point of Coromandel Harbour. The open coast was derived from the regional boundary.
Data for estuarine water classification polygons was sourced from: https://environment.govt.nz/publications/a-classification-of-new-zealands-coastal-hydrosystems/
Data note: Where the hydrosystems formed part of a larger hydrosystem (eg in Kawhia Harbour), then the wider area polygon can include the smaller ones.
The estuarine areas were derived from the NZ coastal hydrosystem from the Ministry for the Environment. Report reference: Hume, T., Gerbeaux, P., Hart, D., Kettles, H., Neale, D. 2016. A classification of New Zealand's coastal hydrosystems. Report prepared for the Ministry for the Environment. Niwa Client Report 2016-062. 120pp. October 2016. This report can be found on the Ministry for the Environment publication website.
NZ Coastal Hydrosystems - MfE Data Management | New Zealand | GIS Map Data | MfE Data Service
Waikato Regional Council metadata link: https://data.waikatoregion.govt.nz:8443/ords/f?p=140:12:9834031883023::NO::P12_METADATA_ID:1088