Drainage plans, guidance and information about stormwater on private property.
Certain conditions must be met when discharging water from a swimming pool or spa pool to stormwater, a river, water course or ground as discharged water may contain traces of chlorine or other chemicals at levels which could be harmful to the environment or toxic to fish.
Permission is not required to discharge domestic swimming pool or spa pool water into the wastewater (sewer) system in Christchurch.
The Canterbury Land and Water Regional Plan includes the following rules for the discharge of swimming pool and spa pool water:
5.10 The discharge of swimming pool or spa pool water into water or onto or into land in circumstances where a contaminant may enter water is a permitted activity, provided the following conditions are met:
5.11 The discharge of swimming pool or spa pool water into water or onto or into land in circumstances where a contaminant may enter water that does not meet one or more of the conditions of Rule 5.10 is a restricted discretionary activity
The exercise of discretion is restricted to the following matter:
If the discharge of swimming pool or spa pool water is a restricted discretionary activity under Rule 5.11, then a consent from Environment Canterbury will need to be obtained. For further information, or if you suspect someone of emptying their swimming or spa pool into the stormwater system that does not meet with the conditions please contact Environment Canterbury(external link) (ECan).
These items must not be put in any wheelie bins. Some items are accepted at EcoDrop(external link) recycling centres, preferably in the original container or in a labelled container:
Please see the hazardous waste and household chemicals webpage for more information.
Stormwater attenuation minimises the effects of increased runoff from small sites in Christchurch.
On undeveloped land, a large proportion of rain soaks into the ground and either flows slowly through the upper soil layers into streams or seeps down into groundwater, as illustrated in the diagram below. Development results in increased impervious (hard) surfaces that have a number of negative effects on stormwater:
Even small sites can have a negative effect on stormwater, and when this is combined with hundreds of other small sites the effect can be significant. It is therefore important to mitigate these effects to help clean up Christchurch’s streams and to reduce flooding. The measures described can also be used by anyone wishing to develop their property in a more sustainable way. Reducing runoff helps to recreate the way that rain behaves on undeveloped land. This can be achieved, in order of preference, by:
The acceptable solutions for minimising the effects of increased runoff from small sites in Christchurch are below.
These solutions are applicable for development on small (less than 1000 m²) residential or commercial sites. However, not all development on small sites requires runoff to be reduced. The criteria below are used by Council to determine whether or not a site requires mitigation.
|Hill sites (>5° slope)||All hill sites are required to install rain tanks or other suitable mitigation devices when new development (or intensification) takes place.|
|Flat, urban areas||
Mitigation is required only if:
Developers of existing sites where the coverage is already greater than 70% of the total site area will need to discuss attenuation requirements with the Council.
These guidelines are about how to reduce the peak flow from your roof, driveway and hardstanding areas.
Under Section 30 of the Water, Wastewater and Stormwater Bylaw 2014, prior written approval is needed from the Council to discharge stormwater into and/or to connect to the Council's stormwater network. This includes but is not limited to: kerb connections, pipes or outfalls into waterways or open drains.
We may impose conditions of connecting to the network based on the requirements of an operative Stormwater Management Plan or a stormwater network discharge consent, which the Council holds from Environment Canterbury. Conditions could include providing onsite rainwater storage to avoid increasing flooding downstream, or a treatment system to remove contaminants from stormwater.
If you are planning a building or development that would use our stormwater network we suggest you get advice early on to take this into account in the design and consenting process. Please contact us at firstname.lastname@example.org with a description of your proposal.
Before construction commences, Council engineering acceptance must be obtained for stormwater works outside the property boundary if the pipe is 225 millimetres diameter or greater. The drawings will be checked to ensure they comply with the Council's Infrastructure Design Standards (IDS), Construction Standard Specifications (CSS) and any other relevant standards and guidelines, then stamped and signed by a Council officer. More information about this can be found on the engineering plan acceptance for three waters infrastructure web page.
In addition to the permission to connect to the Council stormwater network, we also require stormwater discharge compliance with Environment Canterbury’s regional rules. We hold a number of discharge consents throughout the district, which we may use to authorise the discharge of stormwater into our network. Compliance with relevant consent conditions may require onsite stormwater mitigation (treatment and/or attenuation/disposal). Before a building consent can be issued you must seek authorisation from the Council’s Three Waters and Waste Unit by contacting email@example.com.
If we do not authorise the stormwater discharge under one of our global consents, separate authorisation from Environment Canterbury may be required prior to a building consent being issued. The obtained authorisation must be included with the supporting documents of your building consent application.
This is a separate process to the Building Consent process. Even if your building consent plans are approved, this does not constitute permission to connect or discharge into the Council's stormwater network.
If you are rebuilding a house or garage you must check your plans don’t involve building over a Council drain.
The Council's Water Supply, Wastewater and Stormwater Bylaw 2014 specifies the proximity of building work near drains – including public water, wastewater and stormwater pipes. This is so the Council can check, repair and replace drains quickly and efficiently. For more information please see the building over pipes page(external link).
Even small sites can have a negative effect on stormwater, and the cumulative effects of hundreds of other small sites can be significant. It is therefore important to mitigate these effects to help reduce flooding and contaminants in stormwater.
Find out more in the onsite stormwater mitigation guide [PDF, 1.6 MB].