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Canterbury region

Surface Water Zone: Christchurch-West Melton

The Christchurch-West Melton water management zone is approximately 510 Km2 and includes: the lower parts of the Waimakariri River; aquifers that are part of the Canterbury Plains groundwater system; the catchments of the: Ōtūkaikino Creek; Styx River/Pūrākaunui; Avon River/Ōtākaro; Heathcote River/Ōpāwaho; The Avon-Heathcote Estuary/Ihutai; The upper part of the Halswell River/Huritini catchment. The zone includes a large part of Christchurch City Council’s territorial area including all of urban Christchurch and parts of the Port Hills. The western part of the Zone is within Selwyn District.

Water allocation in the Christchurch-West Melton zone is dominated by the urban water take of Christchurch (all groundwater). There is a groundwater protection zone west of Christchurch to limit land use and protect the water quality for Christchurch. Urban water quality in the spring-fed streams (Avon, Heathcote and Styx) is poor although flows remain strong.

Water Use
Surface Water in this Zone

Regional councils collect information about how much water is available and manage resource consents for those wishing to take water from rivers and streams. Use the buttons below to view information on: how much water is available, where it comes from and how its used.


Rainfall {{waterAvailable.rainfall}} Runoff to sea {{waterAvailable.runoff}} Surface Water available: {{waterSource.availableToAllocate}} Irrigation
Town supply
  • How much surface water is there in this zone?

    Rainfall and flow in this surface water zone

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    Rainfall and runoff

    Relative breakdown Source Volume
    Rainfall total:
    {{waterAvailable.rainfall }}
    rainfall Rainfall Total {{waterAvailable.rainfall}}
    Runoff total:
    {{waterAvailable.runoff }}
    runoff Runoff to sea {{waterAvailable.runoff}}

    The table above shows the average amount of rainfall the water management zone receives each year and how much of that flows out to sea. These are approximate figures only.

    Runoff to sea is calculated from surface water flows only.

    Runoff to sea is higher than rainfall because the flows includes half of the Waimakariri River which receives most of its rainfall in the mountains outside of this management zone

  • Water consents: How much water is consented and used?

    Surface water available to consent

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    Consented water in this surface water zone

    Use the tables below to look at how much water is available compared with how much is actually consented within this water management zone. Click the plus to expand subzones where available

    Comparing consents and use
    Amount available to consent In this surface water management zone:
    {{}} {{}}
    available to consent
    Amount consented
    measured and non measured
    Amount used (measured)
    Amount Units Consented or used as a percentage of available
    Total available to consent {{}} {{}} {{}}
    Total consented {{}} {{}} {{}} {{}}
    Total consented and measured {{}} {{}} {{}} {{}}
    Total measured amount used {{}} {{}} {{}}
    Total measured volume used {{}} {{}}

    The table above shows the amount of water that is available for use compared to the amount that has been consented. The ‘Total Consented’ and ‘Total Consented and Measured’ fields are based on percentages of the ‘Total available to Consent’ field. If this field is not populated no data will be displayed. Some consents require actual use to be monitored and this is presented as 'Total measured volume Used' where available.

  • Water consents: How is consented water used?

    Consents by use in this surface water zone

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    Consented water

    Overall annual volume for {{waterAvailable.year}}
    Relative breakdown
    Activity Percentage of total consented Total volume Number of consents
    {{item.displayText}} {{item.displayText}} - - No data available {{item.breakdownPercentage}}% {{item.totalVolume}} m3 {{item.numberOfConsents}}
    Total {{}}% {{}} m3 {{}}

    The above table shows the proportion of water consented for irrigation, industrial, stock, town supply and other. It excludes hydro electricity. In this region/management zone {{hydroUsage.totalVolume}} m3/year is consented for hydro-electricity and makes up {{hydroUsage.percentageConsented}}% of the total water volume consented for this region/management zone


Monitored sites in this Zone

...retrieving sites.

No sites found.