AWMA were engaged by Haslin Constructions to supply WaterNSW with a custom-designed penstock to isolate the Nepean Tunnel during flood events.
The 7km long Nepean Tunnel outfalls into the Broughton’s Pass Weir, which in turn supplies water to Sydney.
Flood events can cause contamination via the tunnel into Sydney’s water supply, so it is necessary to isolate the tunnel during these events.
The 4.5 tonne Dual Leaf TLF Penstock was manufactured from grade 316 stainless steel, 3m high x 3.7 wide, to withstand a hydrostatic load of 10m once closed. The submersible actuation system utilises a remote control head and dual spindles.
AWMA have a long standing history of working in partnership with Haslin Constructions and WaterNSW to deliver successful water infrastructure projects.
Challenges overcome include difficult site access, a heritage listed asset, minimal shut-down period and the requirement of the gate to withstand heavy debris loading.
Photo in header above is courtesy of Haslin Constructions.
