State Water Corporation / Lake Wetherell Fuse Plug Embankments and Levees at Menindee - Contract and Site Management Services - SWCDoc12/32582

MenindeeLakes represent a significant natural, cultural and economic resource for Australia. There are four main lakes in the system including Lake Menindee, Lake Cawndilla, Lake Pamamaroo, and Lake Wetherell (comprising a number of smaller lakes and the channel of the Darling River), comprising three off-stream storages and one river storage - Lake Wetherell, located 10 km north east of Menindee.

There is an existing fuse plug at Lake Wetherell, which was constructed over several years and completed in late 1950’s, to divert incoming flood flows that are in excess of the capacity of the Main Weir.

The fuse plug has only operated on one occasion in 1974, which identified substantial problems with scouring and difficulty in stemming flow once activated. Given the very close proximity of the fuse plug to the river, headwall erosion progressed through the fuse plug to within only a couple of metres of the Darling River channel.

This raised serious concern. Therefore, there was a need for reviewing the fuse plug arrangement and its operation to minimise erosion and also to ensure that the design flood requirements are met.

State Water carried out studies, and revised the fuse plug arrangement in order to minimise erosion along the river bank, and also to divert incoming flood flows that are in excess of the capacity of the Main Weir without overtopping the eastern levee and block bank.

An environmental assessment (Part 5) was undertaken of the proposed works area, and Public Works developed the concept design for the proposed fuse plug arrangement. The concept design report (May, 2012) is attached for reference.

Currently, detailed design and documentations are in progress, and expected to complete in Sept 2012.

Proposed works include earthworks management (cut and fill), installation of sheet piles, removal of trees on the embankment batters and associated works. The details can be seen from the attached Concept Design Report (May 2012).

A Principal Contractor will be appointed to carry out the construction works under a GC21 contract. Expressions of Interest (EOI) have been invited from organisations wishing to pre-registered. EOI closes on Tuesday, 2 Oct 2012.

The Consultant (under this engagement) will provide a construction management team consisting of·a Principal’s Authorised Person’s Delegate (full time on Site), support services (Technical, Contractual, Administration, office support etc) and environmental & WHS inspections and audits, as outlined in the attached RFT documents.

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eTendering

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16 weeks