The Huonville Stormwater project is one of the largest Capital Works Projects Huon Valley Council will have undertaken in a number of years. The Council’s success in obtaining Grant funding from the Federal Governments Building Better Regions Fund Infrastructure Projects Stream along with the additional funds required allocated by Council will finance this project which is now in the final design stages.
The project will see the upgrade of the existing Stormwater Drainage system servicing Huonville, where it has been recognised that the existing drain is under capacity during high rain events and when modelled for future climate change, the potential flooding impacts will increase.
Studies have been undertaken in the past decade recommending various solutions in relation to the Huonville Main Drain. In 2016, Council’s Infrastructure Services Department commenced catchment and stormwater system modelling to confirm the results of past studies and to determine the most appropriate and effective solution to increase the capacity of the Main Drain.
The Team have confirmed that the preferred solution to increase capacity of the Huonville Main Drain entails diverting flows away from the current alignment of Main Drain and into an adjacent catchment – with the capacity to handle the additional flows with no increased impact on flooding downstream.
This project involves three components in order to deliver the improvements:-
Section A: Installation of 1,000 metres of 1600mm pipe through the subdivision.
Section B: Clearing and widening Skinners Creek upstream of Sale Street
Section C: Replace existing Skinners Creek below Sale Street with gabion baskets for approximately 400metres
The design is to ensure capacity for a 1% Annual Exceedance Probability 2090 (this is an attempt to simplify the definition of an extreme rain event that statistically has a 1% chance of occurring in any given year).
The delivery of this project will not mitigate flooding from the Huon River, it is to increase the capacity of the current stormwater network and reduce the instances of overland flooding.
PROPOSED PROJECT PLAN:
A copy of the proposed project plan is available here.
Final engineering designs and modelling are currently being completed.
The Council is committed to ensuring the community is kept informed of the project with community engagement to occur during different stages of the project with the community.
STATUS UPDATE MAY 2019:
Development Application lodged.
Procurement of 1600mm concrete pipes – Contract awarded and fabrication commenced.
Stage 1 – Request for quotation awarded to contractor consisting of approximately 200m of 1600mm pipeline upstream of Sale Street bridge.
Stage 1 – Construction of pipeline to commence upon the issue of Development Application Permit.
Stage 2 – Request for Tender for construction of remainder of pipeline and upstream/downstream Skinners Creek works opened 8 May 2019 – closing 5 June 2019.
Stage 2 – Works to commence late 2019 in expectation of ideal weather and soil conditions.
STATUS UPDATE JUNE 2019:
The Development Application was presented to Council on 12 June and approved for implementation.