How a wetland can help

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The challenge

Our waterways are feeling the pressure of a growing population and changes to land use. A review of the quality of freshwater in Porirua (which includes Kenepuru Stream) shows it is in a poor state. We’re looking to change that.

The opportunities

We’ve been investigating ways to improve water quality and better manage stormwater runoff in the area. One way of achieving this is by creating a wetland at the bottom (northern end) of Cannons Creek Park.

The bottom (northern end) of Cannons Creek Park has been identified as a good location for a wetland. It is often waterlogged when it rains and stormwater from the surrounding neighbourhood naturally flows through this location. The proposed wetland could not only help to clean water before it flows downstream into Te Awarua o Porirua Harbour, but also provide opportunities to create different recreational spaces at the bottom of the park.

What is a wetland?

Wetlands are where the water is at or near the surface of the land, or where the land is permanently or temporarily covered by water.

They can:

  • Create different recreational spaces for everyone to enjoy
  • Improve water quality through careful design
  • Introduce a wide range of water loving plants that allow the wetland to function, whilst looking great
  • Filter stormwater runoff and toxins
  • Provide spaces to learn and connect with water

What would you like to see in this area? We’re keen to hear your thoughts about the proposed wetland and what you would like to see:

  1. At one of the entrances from Castor Crescent into Cannons Creek Park. 

  2. In the area between the sports field and the proposed wetland.

  3. Initial thoughts on the proposed wetland

  4. Things you would like us to think about or include when designing the proposed wetland

 

 

The proposed designs shown are examples of some initial ideas of what we could do in these areas, we want to hear what the community would like to see.

The proposed wetland

 

 This is where the wetland could go, and what the area might look like.

There are some things we can’t change, because of engineering requirements,
such as:

  1. The shape and form (including depths and size) of the wetland. This will help us to maximise water quality improvements and help new plants thrive.

  2. Where underground pipes and other structures go in order to operate the wetland safely.

  3. The concrete channel which runs along the western side of the park
    (near the pine trees).

 There are also a few existing things that we need to factor into the proposed design. 
 

 

 

 

 

Recreational benefits to a wetland

Wetlands can be designed to not only help improve water quality, but also create different recreational spaces for everyone to enjoy. This could include new paths to walk and cycle along, seating or picnic spaces, learning areas or better signage.

Below are some great examples of other wetlands.

 We’re keen to hear your thoughts about the proposed wetland and what you would like to see:

  1. Initial thoughts on the proposed wetland
  2. Things you would lke us to think about or include when designing the proposed wetland
  3. Along one of the entrances from Castor Crescent into Cannons Creek Park
    (See map)
  4. In the area between the sports field and proposed wetland

We’re keen to hear your thoughts about the proposed wetland and what you would like to see Click here.