Water quality for swimming categories for lakes with perimeters over 1.5 km. This dataset was used to compose the current state for water quality for swimming.
Note this data is under review and will be updated in due course. This information is based on modelled and measured data using the approach outlined at
The modelling methods used are outlined in Snelder et al. (2016) Strategic assessment of New Zealand’s freshwaters for recreational use: a human health perspective. LWP Client Report 2016-011 www.mfe.govt.nz/publications/fresh-water/strategic...
This dataset is the geometric version of this: data.mfe.govt.nz/table/53620-river-water-quality-f...
This dataset has now been superseded due to consultation with local authorities, and this is the latest version: data.mfe.govt.nz/layer/95555-river-water-quality-f...
LID: FENZ Lake ID
Name: Name of lake (where available
RC: Regional council name
CHLA: Chlorophyll a (mg/L)
SECCHI: Secchi disc depth (m)
TLI3: Trophic Level Index (unitless)
TN: Total nitrogen (mg/m3)
TP: Total phosphorus (mg/m3)
CyanBVl: Cyanobacterial biovolume (mm3/L)
Cy_cat: Water quality for swimming category see www.mfe.govt.nz/fresh-water/what-government-doing/...
Note: blank cells are reaches where a prediction was not possible because of missing predictor variables.
|Data type||Vector multipolygon||Feature count||3801|
|Services||Vector Query API, Web Feature Service (WFS), Catalog Service (CS-W)|
NZ regional council freshwater nutrient and biomass measurements 2012-2020.
Used to derive nitrogen and phosphorus concentrations and exceedance criteria for managing periphyton in fresh water.
Creative Commons 4.0 International by Ministry for the Environment and Statistics New Zealand
N/A values in the data set refer to an absence of measurement for that specific variable.
Snelder T, Kilroy C, Booker D (2021) Derivation of Nutrient Criteria for Periphyton Biomass Objectives. Using regional council monitoring data. LWP and NIWA Ltd, Christchurch, New Zealand
For subject matter questions please contact firstname.lastname@example.org.
|Services||Web Feature Service (WFS), Catalog Service (CS-W)|