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Kairakau Water Supply Upgrade

The Kairakau water supply was signaled as a key project leading into the 2018 Long Term Plan, – Together we Thrive – as part of the #bigwaterstory.

Council is committed to providing durable infrastructure, that allows for smart growth, is environmentally responsible and ensures our proud communities are able to prosper. With this in mind, the Kairakau water supply project has been expedited due to failures over the Christmas 2019/20 season. This project is a key enabler of our THRIVE objectives while meeting future regulatory requirements and community demands on infrastructure.

Kairakau Water Supply Update:

Our current 2018 Long Term Plan identifies a project to upgrade and future proof Kairakau’s water supply. Council has worked with engineers to develop the best options in doing this and is now seeking your feedback.

This is a key project as part of #thebigwaterstory Capital Programme. 

The current water supply scheme 

Water is pumped from a shallow bore off Kapiti Place, and from a spring off Brodie Place. It is stored in raw water tanks, before it is dosed with chlorine and pumped up to the treated water tanks on the hillside above Kapiti Place. Water is then fed to the town and campground via gravity pipelines. Each property has its own on-site storage tank which is supplied by roof water, as well as water from Council’s water supply scheme. If Council are to continue supplying potable water to the residents of Kairakau, it will need to comply with the Health Act. This requires that the water meets the Drinking-water Standards for New Zealand (DWSNZ).

Issues with current supply

  • The current supply does not reliably prevent or address potential contamination by bugs that can cause illness.
  • Council is not able to actively monitor the water supply system to meet DWSNZ requirements.
  • Some existing infrastructure, such as the concrete storage tank and the spring well head, requires upgrading or repairs.
  • The existing raw water tanks are on leased land.
  • The bore and treated water tank sites are not fenced off to prevent access by stock or unauthorised people (a requirement of the DWSNZ).
  • Connections to individual properties are unrestricted which has previously caused reduced service levels during times of high demand.
  • The on-property water tanks store rainwater from the house roofs in addition to the Council water supply.
  • Roof water is subject to contamination from sources such as such as bird droppings, dust, paint, and sea spray.

The proposed options for the future of Kairakau's water supply:

Option

Estimated costs for physical upgrades

Comments

Option 1:

Upgrade water treatment plant to meet DWSNZ;

Retain roof water;

Install restrictors on all properties;

Relocate raw water tanks.

Capital cost: $445,000

General
• Proposed location for new treatment plant and relocated
raw water tanks is on Council reserve next to 15 Kapiti Place.
• Restricted Council supply would feed individual tanks on properties.
Advantages
• Safe drinking water will be supplied by Council.
• Restrictors on properties will help manage service levels.
Disadvantages
• Supply from roof water is subject to potential contamination.

Option 2:

Upgrade Water Treatment Plant to meet DWSNZ;

Remove roof water;

Install restrictors on all properties;

Relocate raw water tanks;

Add bore and storage to meet peak demands (if required).

Capital cost: $536,000

General

• Proposed location for new treatment plant and relocated raw water tanks is on Council reserve next to 15 Kapiti Place.
• Restricted Council supply would feed individual tanks on properties.
Advantages
• Safe drinking water will be supplied by Council.
• Eliminates the risk of contaminants from roof water.
• Restrictors on properties will help manage service levels.
Disadvantages
• Demand on Council supply will increase if roof water is
disconnected. Additional bore and storage may be required
if the existing spring and bore cannot meet this demand.

Option 3:

Decommission existing supply and put all properties on roof water only.

*If this option was progressed, there may be costs involved with increasing tanks sizes.

Capital cost: $73,000

General

• Council would cease to supply drinking water to the
community.
Advantages
• Residents have control of their own water supply.
Disadvantages
• May not be enough individual storage or rain water available throughout the year to meet demand. Residents may run out of water.
• No supply of treatment for roof water.
• Local Government Act (LGA) requires a consultation process
be undertaken to close a water supply so even if this is
the preferred option the outcome of this process is not
guaranteed.
• Camping ground will no longer have a potable water supply.

Option 4

Decommission existing supply and put all
properties on roof water only; add point-of-entry treatment and storage.

*If this option was progressed, there may
be costs involved with increasing tanks sizes.

Capital cost: $593,000

General

• Council would cease to supply drinking water to the community.
Advantages
• Residents have control of their own water supply.
• Additional storage and treatment supplied by Council.
Disadvantages
• May not be enough individual storage or rain water available throughout the year to meet demand. Residents may run out of water.
• Local Government Act (LGA) requires a consultation process be undertaken to close a water supply so even if this is the preferred option the outcome of this process is not guaranteed.
• Camping ground will no longer have a potable water supply.

 Location of key Kairakau water supply elements:

Location of key Kairakau water supply elements

 

Proposed location of new treatment plant and raw water tanks:

Proposed location of new treatment plant and raw water tanks

 

 Indicative layout of new treatment building and relocated raw water tanks based on Option 1 or 2:

Indicative layout of new treatment building and relocated raw water tanks based on Option 1 or 2

Kairakau Community Meeting:

Sunday December 6, 9.30 AM

Kairakau Beach Campground Hall

After reviewing the community engagement received, Council is working with our project engineers and property team to assess additional options, and potential edits to current proposed options, (please see original options report under Key Files and Documents).

Council aim to release an updated Options report in early 2021.

View a summary of feedback received during the engagement process in the Engagement Summary Report.

Frequently Asked Questions

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Water usage data for the past two years indicates Kairakau uses an average of 24m3/day across the year from Council supply. Usage is usually higher in summer with the average usage from December to February increasing to 34m3/day.
1m3 is the equivalent to 1000 litres. 

Currently water is dosed with Chlorine to disinfect and kill germs. Chlorine is added to the water at a dosing point before it is distributed to the community, however there is no automated system in place. Council actively samples points within the distribution network to confirm chlorine levels and tests for other quality parameters – this could be viewed as lead and lag measurements.

An upgrade is required to ensure Council is providing safe drinking water to the community. In order to do this Council has to comply with Drinking Water Standards for New Zealand. The current supply does not comply, therefore upgrades are required.

This project is an important project as outlined within the wider programme of work and the council’s commitment to building durable infrastructure to ensure smart growth that is environmentally responsible and allows communities to prosper.

A water safety plan documents the risk-based assessment of the current water supply scheme and control measures which should be implemented to enable a safe and secure supply of drinking water to consumers.

The project has been set aside budget of $549,000 in the 2018 Long Term Plan, and Council are planning to deliver the project within the budget set aside.

As the project funding was planned for through the 2018 Long Term Plan process, there is not planned to be a further rating impact because of this project. The funding to deliver this project is currently accounted for in the 2018 Long Term Plan rates forecasts. We expect to draw the loan down for the project in 2021.

The land is currently vested directly to Council as Local Purpose (Recreation) Reserve under the Reserves Act. To locate further water infrastructure on this land will require a planning amendment – although the land is designated under the district plan as water infrastructure.

A restrictor is the flow control device fitted to the service pipe that goes to your supply tank - the restrictor allows water to flow steadily into a tank at a low rate, sharing the available water fairly.

Water will be supplied at Kairakau from Council’s supply only through a connection to an on-site water storage tank at each premise. This supply may be used as an “on demand” supply for “ordinary use”. The water storage tank shall be of minimum volume of 1,800 litres. The supply pipe from the point of supply must be connected to the water tank and include a ball cock or similar device in the tank to prevent overflow of the water in the tank. No connections shall be taken off the supply pipe, and all plumbing on the premises must be feed from the water tank.

The water bylaw can be accessed on Council's website here

November 2020: We expect to compete community engagement

March 2021: Confirm the option and work on design

April 2021: Procure and commence construction. 

December 2021: Expect to have the project completed by the end of 2021. 

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