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Lake Kohangatera

Lake Kohangatera is a typical example of a small, shallow coastal lake. Located in the East Harbour Regional Park on Wellington’s south coast, Kohangatera is the larger of the two Parangarahu Lakes (the other of which is Kohangapiripiri).

Compared to other lakes around New Zealand, Lake Kohangatera is relatively unimpacted and physically unchanged. The plant species diversity and extensive native vegetation has given Lake Kohangatera its reputation as a nationally outstanding example of a ‘healthy’ lake. It also is listed in Greater Wellington’s existing Regional Freshwater Plan as a water body with nationally threatened fish species.

Lake Kohangatera has a total area of 21 hectares; almost twice the size of Kohangapiripiri. However it is a relatively shallow lake, with a maximum depth of 2.1 metres. Land use in the Kohangatera catchment is primarily indigenous forest and scrublands, with regenerating pasture and significant wetland areas towards the north of the lake.

A variety of recreational activities are supported by Lake Kohangatera, including walking, mountain biking, bird watching and duck hunting at specified times of the year. Evidence of Māori huts, ovens and workshop sites can also be seen around the lake, which is considered culturally significant.

LakeSPI monitoring at this site is carried out by the Greater Wellington Regional Council periodically; the last observations were recorded in February 2016. The current ecological condition of the lake is considered “excellent”, meaning that the lake supports a diverse range of native vegetation, with little to no exotic weeds.

Lake Kohangatera is separated from the Cook Strait by a naturally occurring gravel bar. This separation of sea and freshwater has led to a low diversity of native freshwater fish which require access to the sea to complete their lifecycles. However, the lake is thought to drain to the sea via seepage and the breaching of this gravel bar is considered to have increased over the past decade.

Lake Summary
  • Lake size
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  • Maximum depth
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  • Catchment size
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Scientific data for this lake

This dashboard shows information on the data collected by the regional councils for two lake water quality and ecological condition measurements. Lake SPI (Lake Submerged Plant Indicators) and TLI (Trophic Level):

  • Water Quality

    Trophic Level Index (TLI)

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    This measure is the Trophic Level Index (TLI). The TLI indicates the lifesupporting capacity of a lake and is based on four water quality indicators.

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    Trophic Level Index (TLI) history for this lake

    Trophic Level Indicator (TLI) which measures four parameters: water clarity, chlorophyll content, total phosphorus and total nitrogen. From these parameters a TLI value is calculated. In cases where water clarity data is missing a three parameter TLI is calculated. The higher the value, the greater the nutrients and fertility of the water which encourages growth, including algal blooms. As a rule, higher TLI scores mean poorer water quality. View a factsheet on TLI

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    TLI history for Lake Kohangatera
    Year
    TLI history for Lake Kohangatera data table
    Year TLI Score
    Year TLI Score

    What do the icons mean?

    VERY GOOD
    Very good water quality. Trophic Level Index of less than 2. Microtrophic lake conditions.
    GOOD
    Good water quality. Trophic Level Index of 2-3. Oligotrophic lake conditions.
    AVERAGE
    Average water quality. Trophic Level Index of 3-4. Mesotrophic lake conditions.
    POOR
    Poor water quality. Trophic Level Index of 4-5. Eutrophic lake conditions.
    VERY POOR
    Very poor water quality. Trophic Level Index of greater than 5. Supertrophic lake conditions.
    NO DATA
    No data available.
  • Ecological Conditions

    Submerged Plant Indicators (SPI)

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    The LakeSPI status describes the ecological condition of the lake and is based on plants present.

    LakeSPI data provided by NIWA

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    LakeSPI history for this lake

    LakeSPI (Lake Submerged Plant Indicators) is a method of characterising the ecological condition of lakes based on the composition of native and invasive plants growing in them. A higher LakeSPI percentage result is associated with better ecological health:

    LakeSPI N/A
    LakeSPI {{spiData.grades[0].Value}}%

    The overall LakeSPI score is calculated using a Native Condition Index ('good' plants) and an Invasive Impact Index (introduced, non-native plants):

    Native Condition N/A
    Native Condition {{spiData.grades[0].NativeIndex}}%
    Invasive Impact N/A
    Invasive Impact {{spiData.grades[0].InvasiveIndex}}%

    A higher Native Condition percentage is also good, but a higher Invasive Impact percentage is bad. View a factsheet on SPI

    • SPI %
    • Native Condition %
    • Invasive Impact %
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    LakeSPI history for Lake Kohangatera
    Year
    LakeSPI history for Lake Kohangatera data table
    Sample Date Status LakeSPI % Native Condition Index % Invasive Impact Index %
    LakeSPI information has been provided by NIWA.

    What do the icons mean?

    EXCELLENT
    Excellent ecological health. A LakeSPI score of 75-100%.
    HIGH
    High ecological health. A LakeSPI score of 50-75%.
    MODERATE
    Moderate ecological health. A LakeSPI score of 20-50%.
    POOR
    Poor ecological health. A LakeSPI score of 0-20%.
    NON-VEG
    Non-vegetated. A LakeSPI score of 0% (there are no plants present).
    NO DATA
    No data available.

Download Data

.ZIP file of lake data.
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Disclaimer

 LAWA Partners shall not be liable, whether in contract, tort, equity or otherwise, for any loss or damage of any type (including consequential losses) arising directly or indirectly from the inadequacy, inaccuracy or any other deficiency in information supplied irrespective of the cause.  Use of information supplied is entirely at the risk of the recipient and shall be deemed to be acceptance of this liability exclusion.

Sites

Monitored sites on Lake Kohangatera

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