Bowraville Off-River Water Storage Project
Please click on the above link to view photographs of the construction progress of the Bowraville Off River Storage facility.
Updated 27 March 2013
The Nambucca Shire water supply is a single source supply drawn from bores sunk into alluvial deposits adjacent to the Nambucca River upstream of the town of Bowraville. Studies have confirmed that the acquifer has limited storage capacity and cannot be expected to meet current and future water supply demands during periods of drought. During the drought of 2002 two of the eight bores began to run dry and it was estimated that there was between 30 to 60 days supply of water available when the drought broke.
The Bowraville Off River Water Storage Project was set up with the aim of providing a means for the Shire water supply to be secured against drought. The project now being developed was chosen from a range of alternative schemes in 2006, following community consultation. The project involves construction of a series of new bores, collection tank, water transfer pipeline, water pumping station and a new storage area all within the Bowraville area. The water storage will be filled by pumping water from an enlarged borefield during times when river flow is not low. Environmental flows will be maintained in the river by feeding the stored water directly into the town water supply system during periods of low river flows.
The project is being delivered by Nambucca Shire Council with the assistance of the NSW Department of Public Works as Project Managers and the NSW Office of Water as funding partners and is expected to cost in the order of $54 million. The project is part of a wider integrated water cycle management strategy for the region which may also include further water conservation and effluent reuse measures.
Project timeframe and phases
The project has been undertaken in three phases designated as the preconstruction phase, construction procurement and the construction itself.
The preconstruction phase involves the following works:
- Borefield investiagation studies and reporting
- Community consultation
- Assessment of the potential environmental impacts and preparation of an Environmental Impact Statement
- Concept design
- Submitting the EIS document and concept design to Council for approval
- Detailed design
The preconstruction phase is now complete. Council engaged NSW Public Works to manage this stage of the project and GHD Pty Ltd were engaged to prepare the Environmental Impact Statement as well as the concept and detailed designs of the project infrastructure.
The Environmental Impact Statement (EIS) was completed in October 2009 and was placed on public exhibition for community comment until February 2010. The EIS was assessed by Council following consideration of all submissions and Council granted development approval for the project in October in 2010. Please click here to view the Environmental Impact Statement.
Detailed design of the project was completed in February 2012.
Council invited Expressions of Interest (EOI) for construction works on the project in July 2011 and 14 submissions were received. Following evaluation of the EOI submissions Council selected four contractors to participate in an Early Contractor Involvement (ECI) process with a view to being invited to tender on the construction work for the project.
The ECI process involved attendance at a number of workshops where the contract designs and documentation were reviewed in detail and the allocation of risks were clarified. This process aims to ensure that any ambiguity in the documents is eliminated and all potential tenderers are fully informed on the project and expected outcomes prior to submitting a tender.
The ECI process also advised the contractors that the construction works would be let as two separate work packages. Package A was for storage construction including embankment earthworks, outlet tower, spillway, valve house and the access road. Package B was for the bores, collection tank, pump station, valve cluster and transfer pipework.
All contractors selected for the ECI process were subsequently invited to submit a tender for the construction works. These contractors were:
McMahon Contractors Pty Ltd (Package A & B)
John Holland Pty Ltd (Package A & B)
Haslin Constructions Pty Ltd (Package A & B)
Ledonne Constructions Pty Ltd (Package B only)
Tenders closed on 24 April 2012 and following a detailed evaluation of the tenders a report was prepared for Council recommending that the tender be awarded to two separate contractors – Haslin Constructions Pty Ltd for Package A and Ledonne Constructions Pty Ltd for Package B
At the ordinary meeting of Council on 11 July 2012 Council resolved to proceed with the construction project and award the construction contracts in accordance with the recommendation above.
NSW Public Works (Coffs Harbour) have been appointed as project managers for the construction works and their team brings with them a wealth of experience from the recent construction of the Shannon Creek Dam for the Coffs Harbour and Clarence Councils.
The construction contract has a completion period of 60 weeks. Works on site have commenced, however, heavy rain events at the start of this year have caused significant delays to the dam contract in particular. Extensions of time have been granted and works on the dam are now not expected to be completed until February 2014. The Package B works are expected to be completed toward the end of 2013.
It may take up to a year to fill the storage and bring it into full operation. Progress on the works can be viewed on the Dam Construction Photo Gallery link on Council's website.
Council has secured funding assistance from both the State and Federal Governments. The State Government has confirmed that they will provide subsidy for 39.8% of Council’s project cost. The Federal Government has committed $10 million to the project of which $1 million was contributed to the design work.
An extensive program of community consultation is an essential part of this project. Consultaton to date has included regular newsletters, information in local media including the Nambucca Shire Newsletter and Hibiscus Happynings, and stakeholder briefings.
Council engaged consultants KJA, to undertake community consultation during the investigation and design phase of the project.
How you can find out more
You can find out more by contacting Council's Manager Water and Sewerage, Richard Spain on 6568 0234.