Search all sites near me now
Search your favourite swimming spots

Lake Horowhenua

Lake Horowhenua is a shallow coastal dune lake with valuable wetland habitat. The lake is popular for sailing but is not suitable for swimming.

Lake Horowhenua is a shallow coastal dune lake and has considerable ecological and culturally valuable wetland habitat. Nutrients from 25 years of treated sewerage discharge into the lake and ongoing land-use effects has lead to the present hypertrophic condition (lakes that have been excessively enriched with nutrients). The lake has cyanbacterial blooms and a problem with dense weed growth that can interfere with contact recreation during summer. Efforts to clean-up up the lake have been on going for several decades and include the establishment of a full native planting buffer strip around the lake, and a formal catchment management strategy being established by Horizons Regional Council. Alongside the science and restoration efforts, several key partners have developed and signed the Lake Horowhenua Accord. Five parties representing the Muaūpoko owners, community interests and statutory bodies have agreed to work together to provide leadership; to halt the degradation and put in place remedial measures that will begin to return Lake Horowhenua to a taonga (treasure) that holds pride of place in the Horowhenua community. The Lake Horowhenua Clean-up Fund was established and primary projects in this work programme are to provide physical and infrastructural assets that address the key issues of toxic algal blooms including via lake weed harvesting, sediment and nutrient inputs to the lake from rural and urban sources and to improve habitat and access to the lake for native fish.

Lake Summary
  • Lake size
    {{lakeDetails.size}}
  • Maximum depth
    {{lakeDetails.maxdepth}}
  • Catchment size
    {{lakeDetails.catchmentsize}}
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)

    {{rating() | uppercase}}

    {{comment()}}

    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.

    Show more information Hide information

    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

    Showing:
    to
    TLI history for Lake Horowhenua
    Year
    TLI history for Lake Horowhenua 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)

    {{rating() | uppercase}}

    {{comment()}}

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

    LakeSPI data provided by NIWA

    Show more information Hide information

    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 %
    Showing:
    to
    LakeSPI history for Lake Horowhenua
    Year
    LakeSPI history for Lake Horowhenua 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.
Download
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 Horowhenua

...retrieving sites.

No sites found.

Live Data

Disclaimer

The Environmental Data produced by this page should be used as a guide only. LAWA takes no responsibility for the accuracy of information presented, and accepts no liability for actions taken of others based on this information.