Archive for the 'Meola Creek Waititiko' Category

Restoring Auckland’s Puriri Rock Forest

August 10th, 2018

Meola Creek is one of the areas in the Auckland isthmus which has remnants of puriri forest on lava flow.  Auckland Council defines rock forest as critically endangered – see Auckland ecosystem types. Overall only a few hectares remain, mostly near Maungawhau, especially at Withiel Thomas Reserve.

Auckland’s lava rock forest contains hardy broadleaved tree species such as puriri, pohutukawa, karaka, titoki, kohekohe and mangaeo, while podocarp species such as rimu and kahikatea are typically absent. Kawakawa and whau are common. Both these distinctive smaller trees are endemic to NZ and have stunning seed capsules. All these trees provide much needed shade for life in the spring-fed creek waters.

Here puriri flowers are on the left and seeds, flours and leaves on right.  Many photos of all these plants can be found on Plant Conservation Network site.

The longest lava flow in the Auckland Volcanic field originated from Titikopuke (Mt St John) and reached the sea at Te Tokaroa (Meola Reef). Its edge defines the course of Meola Creek. The forest that grew on the Auckland lava flows has always been one of New Zealand’s most locally confined landscape types, and the growth of Auckland city has almost completely destroyed it. A story of heroic large scale forest restoration can be found here. Passionate volunteers have spent 20 years on Maungawhau clearing weeds such as tradescantia to allow natural regeneration of native plants.

Ecological restoration of lava flow forest continues in the Roy Clements Treeway by removing exotics, weeds and replanting with appropriate species. Once established, most plants will self-seed and the rock forest can be sustained.

Watercare provided our first kohekohe in 2017 and it is thriving. STEPS is also working with AELB and Auckland Council organisations to restore more rock forest remnants. Landscape scale weed control of privet and asparagus weed will be needed before planting can take place. If you need more information or would like to be involved please contact STEPS on this website or by Facebook @STEPSNZ

Here whau is on left and kawakawa on right, Roy Clements Treeway August 2018.

June Working Bee – Follow Up Planting

Meola Aquifer – how will it handle intensification?

December 27th, 2017

A study conducted for Auckland City’s integrated catchment study looked at two large aquifers on the isthmus, comparing current with “maximum probable 2050 land use” in Meola and Onehunga. This picture shows the  “paleo ridges” and “paleo valleys” of pre-volcanic Waitemata sandstone, along which the groundwater flows. It seems Meola Creek and its former tributaries closely follow the valleys of the old landscape.

The study concluded that although spare capacity existed in the aquifers to accommodate additional stormwater disposal there was a major unresolved issue is to find practical ways to capture and inject large volumes of stormwater generated by short, high intensity storms.  It noted that additional flooding would occur in high rainfall years.   See ICS Groundwater Behaviour and Assessment

This poses a few questions such as:

  • what is the significance of ‘spare capacity’ in the aquifer?  Does it mean that groundwater supplies have been reduced?
  • what methods would Auckland Council (AC) grant itself consents for, in order to reduce flooding and recharge the aquifer?
  • how would AC guarantee no reduction of groundwater quality as it tries to deal with further urban development and intensification?
  • what stormwater treatment methods can AC show us now as functional examples?

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