Matuku Waterway flood mitigation works are underway.
The Heathcote Valley experienced flooding in a number of areas during the flood events of 2014. The Land Drainage Recovery Programme is working on a diversion of the Matuku Waterway to reduce flooding in Heathcote Valley downstream of Bridle Path Road. The work is being done in three stages:
A stormwater pipeline has now been constructed, beginning at the Heathcote Valley Drain Inlet, and finishing in Cooks Lane. This pipeline diverts stormwater flows from Heathcote Valley Drain in Morgan's Valley to the lower Matuku Waterway in Cooks Lane, and reduces flooding risk to nearby properties.
A section of Cooks Lane Waterway will be widened to accommodate the diverted flows. These works will involve small scale excavation and replanting in the reserve area between Cooks Lane and Deavoll Place.
The pathway connecting Cooks Lane and Deavoll Place will be closed during construction. Originally it was thought that this pathway could remain open throughout the duration of these works. Now the design has been finalised, it has become apparent that it is impractical, from a health and safety perspective, to keep the pathway open to the public during construction. This is due to the contractor needing truck access and room for staging and stock piling materials along the pathway line from Cooks Lane, and the lack of room for an alternative pathway.
These works were planned to start in June, but the contractor and the Council have decided to delay works due to the extremely wet ground conditions in the proposed work area. This is to better manage the risk of environmental damage through increased sediment runoff, and the risk of construction taking longer and lengthening the impacts on residents.
Heathcote Valley Drain will be rock-lined to prevent further erosion from occurring and reduce the risk of water overtopping the drain inlet. This work is currently in the final concept design stages. We will provide further updates prior to construction works starting.
The works will be are estimated to cost up to $2.5M, funded from the LDRP Budget.
We will continue to work closely with the Heathcote Valley community to keep them updated during the course of the works.