The Goldfields Water Supply Scheme is a pipeline and dam project that delivers potable water from Mundaring Weir in Perth to communities in Western Australia's Eastern Goldfields, particularly Coolgardie and Kalgoorlie. The project was commissioned in 1896 and completed in 1903. The pipeline continues to operate today, supplying water to over 100,000 people in over 33,000 households as well as mines, farms and other enterprises.
Water scarcity During the early 1890s, thousands of settlers had travelled into the barren and dry desert centre of Western Australia seeking gold, but the existing infrastructure for the supply of water was non-existent, and an urgent need arose. Prior to the scheme, water condensers, irregular rain, and water trains were the sources. Railway dams were essential for water to supply steam locomotives.
Origins of the scheme Throughout the 1890s, water availability issues in Coolgardie and in the Kalgoorlie-Boulder region were causing concern. On 16 July 1896, the Premier of Western Australia, John Forrest introduced to Western Australian Parliament a bill to authorise the raising of a loan of £2.5 million, equivalent to A$448.7 million in 2022, to construct the scheme: the pipeline would convey 23,000 kilolitres (6.1 million US gallons) of water per day to the Goldfields from a dam on the Helena River near Mundaring in Perth. The scheme consisted of three key elements – the Mundaring Weir, which dammed the Helena River in the Darling Scarp creating the Helena River Reservoir; a 760-millimetre (30 in) diameter steel pipe which ran from the dam to Kalgoorlie 530 kilometres (330 mi) away; and a series of eight pumping stations and two small holding dams to control pressures and to lift the water over the Darling Scarp.
Construction and criticism
The scheme was devised by C. Y. O'Connor who oversaw its design and most of the construction project. Although supported by Premier Forrest, O'Connor had to deal with widespread criticism and derision from members of the Western Australian Parliament as well as the local press based on a belief that the scope of the engineering task was too great and that it would never work. There was also a concern that the gold deposits would soon be depleted, and the state would have a significant debt to repay but little or no commerce to support it. Sunday Times editor Frederick Vosper – who was also a politician, ran a personal attack on O'Connor's integrity and ability through the paper. Timing was critical, Forrest as a supporter had moved into Federal politics, and the new Premier George Leake had long been an opponent of the scheme. O'Connor died by suicide in March 1902, less than 12 months before the final commissioning of the pipeline. Lady Forrest officially started the pumping machinery at Pumping Station Number One (Mundaring) on 22 January, and on 24 January 1903 water flowed into the Mount Charlotte Reservoir at Kalgoorlie. O'Connor's engineer-in-chief, C. S. R. Palmer took over the project after his death, seeing it through to its successful completion. The government conducted an inquiry into the scheme and found no basis for the press accusations of corruption or misdemeanours on the part of O'Connor.
Pipeline
The pipes were manufactured locally from flat steel sheets imported from Germany and the United States. Mephan Ferguson was awarded the first manufacturing contract and built a fabrication plant at Falkirk (now known as the Perth suburb of Maylands) to produce half of the 60,000 pipes required. C & G Hoskins established a factory near Midland Junction (now known simply as Midland) to produce the other half. When built, the pipeline was the longest fresh-water pipeline in the world. The pipeline ran alongside the earlier route of the Eastern Railway and the Eastern Goldfields Railways for parts of its route, so that the railway service and the pipeline had an interdependence through the sparsely populated region between Southern Cross and Kalgoorlie. The scheme required significant infrastructure in power generation to support the pumping stations. Communities oriented to the maintenance of the pipeline and pumping stations grew up along the route. With improved power supplies and modern machinery and automation, the scheme now has more unattended pumping stations operated by fewer people.
Dam
Construction of the dam started in 1898. When completed in 1902 it was claimed to be the highest overflow dam in the world. Shortly after World War II, raising the wall was proposed and by 1951 the height of the dam wall was increased by 9.7 metres (32 ft).
Mundaring Weir branch railway
The Public Works Department originally constructed and ran the railway from the Mundaring railway station for the purpose of delivering materials to the construction site. The Western Australian Government Railways took over the railway operation. It ceased operation in 1952, and the connecting railway line at Mundaring closed in 1954.
Design challenges The sudden Darling Range height rise between Mundaring and Northam required the location of Pumping Station number two to be close to number one. The Avon River in Northam required the construction of the Poole Street Bridge after failure of river bed pipes in 1917. The distance was compounded by the height the water had to be lifted. To rise the almost 400 metres (1,300 ft) in altitude, issues with friction meant that a head of 800 metres (2,600 ft) had to be achieved. O'Connor had eight pumping stations that each pumped the water to the next of the receiving tanks in his plans. Leakages were noted early; by the early 1930s, 1.7 gigalitres (450 million US gallons) of water per year – a quarter of the total volume of water being pumped from Mundaring Weir – was leaking from the pipeline.
Pumping stations
With most of the original stations being steam-driven, a ready supply of timber was needed to fire the boilers. Hence the pipeline route was closely aligned with the Eastern Railway. To enhance the reliability of the system, each pumping station was designed and constructed with a spare pumping unit. Due to pressure requirements related to the slope of the pipeline, stations one to four required two pumping units to be in operation. Stations five to eight only required one operating pump, due to a lower rise in height between those stations. James Simpson and Co supplied 3,500 tonnes (7.7 million pounds) of equipment in 5,000 separate boxes for the construction of the pumping sets.
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