Cairn Curran Reservoir Outlet Upgrade Stage 1

Author: Jim Wheelhouse, Project Delivery Catchment Services, GMW. Cairn Curran Reservoir is part of the Loddon System and is located on the Loddon River, upstream of Baringhup near Maldon in Victoria. Cairn Curran Reservoir is operated in conjunction with Tullaroop and Laanecoorie Reservoirs. The outlet works are situated through the main embankment, and comprise a wet intake tower, a concrete culvert housing the two outlet conduits, and a power station and outlet valve at the downstream end. The service gate, in the intake tower, comprises two separate gate sections which can be coupled together to close off both the penstock and irrigation conduit. The service gate is suspended from an electrically driven wire rope hoist housed in the top of the tower. The service gate(s) travels down guide rails which run the height of the 32m tower and control the position of the gate(s) to the bottom of the tower. Near the bottom of the tower the gate(s) additionally engage heavily constructed main rails designed to take the water forces acting on the gate(s).

Records show that the hoist was originally tested (circa 1958) with both gates suspended and moved down and up the tower to close off both conduits, also that the larger gate (only) was closed into partial flow. Since this time only the larger of the two gates has been suspended from the hoist, the smaller gate has been uncoupled and unused, stored in an alcove below the tower operating deck. The primary purpose of the service gates is to act as an emergency closure guard gate in the event of a failure of the downstream equipment in the outlet. The Cairn Curran Outlet Works Upgrade - Final Report for Review of Emergency Guard Operation (GHD 2012) confirmed that the combined weight of the two gates (20 tonne) is necessary to ensure closure under flow conditions. A thorough current condition assessment of the hoist to confirm the hoist is adequate for continued service carrying both gates. A major project challenge was working with leakage through the existing closure stop logs at a rate of 4 ML/d. 591,000. During the outage, riparian releases were passed downstream through a low flow valve attached to one of the radial flood gates. Stage 2 works will include replacing the electrical and control system, replacing conduit air valves and automation of the irrigation conduit guard gate.

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