Walka Water Works

The Newcastle Borough Council established a Water Committee to try to improve water supply to residents of the inner city area in February 1875 after a very dry period. In 1876, George Lloyd, the local representative in the Parliament of New South Wales raised the matter of government help to finance the construction of a water supply for Newcastle. To the surprise of many, other parliamentarians supported the motion. In 1877 Sir Henry Parkes sent noted British hydraulic engineer William Clark to advise on possible water sources for the Lower Hunter towns. Clark had been brought to NSW to advise on Sydney's water supply and drainage problems. Clark's report recommended Walka as the site for a water works which would supply 37 000 people at the estimated cost of 170 000 pounds.[1]

The citizens of Newcastle were pleased with the scheme and its cost and quickly approved the plan. They sent a deputation to Parliament on 5 December 1877 with strong encouragement from John Robertson, the Colonial Secretary. Construction of a water supply was imminent. However, a new government came to power before the end of the year. Another deputation was sent to Sydney, but James Farnell and his government preferred to give preference to the construction of a second water supply in Sydney[1]

At the end of 1878 a new government took over and a third deputation was sent to Parliament. By May 1879 the necessary surveys and cost estimates had been sufficiently advanced to allow the ordering of machinery and iron pipes but the government refused to bow to pressure from the Hunter region to sanction full expenditure. In 1881 the first steps were taken and the Newcastle and Buttai reservoirs were constructed. Land was resumed for the Walka works in June that year.[1]

The Public Works Department called for tenders to construct the Walka reservoir and associated works in December 1882 and contracts were signed in April 1883. At least four contracting firms were involved, Messrs. T. Smith and M.Burley, George Blunt, James Russell and James Watt and Company. Smith and Burley were responsible for the tunnel which drew water from the river to the pumping station. George Blunt built the reservoir, filter beds and settling and clear water tanks and James Watt and Company of Birmingham supplied and erected the three pumping stations installed at Walka in 1886. James Russell completed the construction of the engine and boiler house although there is dispute as to whether Russell won the contract originally. It is argued that M. Parkhill, a relatively unknown contractor, was given the contract in 1885 but became insolvent, leaving the opportunity for Russell to take over.[1]

Boilers at the Water Works

The design for the complex was undertaken by notable English engineer Sir William Clark and was a major engineering project for the area at the time.[2] Water was pumped from the Hunter River to a reservoir along a brick tunnel approximately 6 feet (1.8 m) in diameter and 9 metres (30 ft) below ground.[2][3] At full operation, it had three pumping engines (150 hp each and with a flywheel weighing 36 tonnes), two horizontal compound pumps and a triple expansion surface condensing pump engine.[2] Water would be pumped from the river at Oakhampton up to the Walka reservoir (still visible as the Walka lake today), then pumped onwards to another reservoir 6 miles (9.7 km) away at Buttai; where it was "gravitationally distributed".[4]

The waterworks served as the sole water supply of the Lower Hunter towns from 1887 until 1929 when it was superseded by the Tarro Pumping Station. Industrial development and an increasing population in the period resulted in a growth in demand for water and the need for considerable development and modification at the site. In 1892 the pumps were improved and a third pump was attached to the No.3 beam engine. This was also the year that the Hunter District Water Supply and Sewerage Board took over the works. In 1896-7 a second pipe was constructed between the Hunter River and the waterworks. In 1900 Newcastle was consuming double the water it had consumed in 1892.[1]

The implementation of the waterworks scheme for drinking and washing made possible the provision of sewerage systems to the towns. This improved the health of the community by reducing the likelihood of disease and improving the cleanliness of the population and their urban environment.[1]

Severe droughts in 1902 and 1905-6 produced supply problems and demonstrated that the Hunter River was no longer an adequate water source for the region. In 1908 the number of filter beds was increased from four to six and by 1910 it had become necessary at times to operate three beam pumping engines simultaneously. In 1913 more equipment was installed and a further four rapid water filters were installed in 1916.[1] At peak operation the waterworks produced 3843 megalitres (in 1915).[4]

As the population of the area continued to increase, other sources of supply were developed – namely Chichester Dam near Dungog. From 1923 to 1940 the waterworks were used as a backup water supply only.[4]

In 1925 the complex was put on standby and with the onset of the Great Depression and the completion of Tarro pumping station at Tarro, the plant was shut down as an economy measure in 1931.[1] After the Second World War in 1949 all the plant and machinery was sold for scrap, fetching £2,500.

Two years later, in 1951, the site was reopened as a temporary coal power station by the Electricity Commission to overcome post-war electricity shortages. What was described as a "package power plant" was bought from General Electric and imported from America. The plant was shipped out in pieces, then taken to the site by rail (to Maitland station) and a specially made truck. GE engineers also came out to assemble the plant.[5]

It began producing electricity in 1953. Three boilers ran on coal, and another ran on oil, though later this became a coal/oil combination. Two rail lines were built to the power station from the North Coast railway line.[6]

Using Walka as a power station was controversial. Initially the power station suffered from sinking foundations – leading to the temporary sacking of 120 workers, until it was agreed that the sinking was a result of recent rain.[7] During construction, the workforce went on strike after a boilermaker union member was sacked for "misconduct" towards his foreman.[8] This was eventually resolved, but in December 1953 the power station suffered another setback when one of its oil storage tanks collapsed in gale-force winds. The station was also unpopular with local vegetable growers, who complained about the amount of soot the station was producing.[6]

The powerplant was decommissioned in 1976 and dismantled in 1978.[1]

Not until 1984 were there definite attempts to reopen the site. At this time a Trust was formed, aiming to open the site and restore the Waterworks complex. The complex had been classified by the National Trust in 1976. Today the area is open as a free public reserve, with barbecues, picnics areas, a playground, walking trails and a 7 1/4 inch gauge miniature railway that operates passenger rides each Sunday. The reservoir and surrounding plant life make it a unique environment for birds and animals in the area.

Pump house and smoke stack, 2008

2 storey polychrome brick structure with walls up to 1 metre thick. It contains a basement approximately 10 metres deep. Six cast iron columns built to support the first floor remain but all other original features have been replaced or obscured by a raised floor, office partitions and a stairway constructed in the 1950s. The first floor retains sufficient fixtures to demonstrate its previous operations. Original sections of flooring remain as do cast iron cross beams, shoes, joists, decorative grills, timber floor joists and the pilaster which carried the overhaul beam crane. A large sandstone block is located within the wall above and below each pair of joists. The original colour scheme is still visible.[1]

Attached to the northern end of the main pump house. The roof is double hipped and clad in corrugated iron and has been subject to modifications. Surviving features include the steam header access hole in the southern wall, column capitals, the flue, the access door to the engine room and an unusual configuration of windows beneath relieving arches in the brickwork.[1]

Polychrome brick standing 36 metres tall. Square base translating through an octagonal section to become a tapering cylinder, terminating in finely corbelled brickwork. A flue leads to the chimney from the centre of the western wall of the boiler room.[1]

Built in 1893 as an office. The original 9 pane windows have been replaced by 6 pane windows. An extremely unsympathetic entrance and set of stairs have been inserted in the southern wall. Internal amenities installed during the 1950s by the Electricity Commission and plumbing fittings remain.[1]

Built in 1913, the building abuts the main pumphouse, its form and detail successfully reflecting the original building. The pump house required the bricking in of openings to the main pump house and removal or relocation of the original window joinery. The existing 9 pane windows on the western side of the building are probably the only remaining original windows of the complex. The internal brickwork is rendered and painted but along its eastern side it retains the profile of the exterior of the main pump house. The roof trusses of riveted steel are exposed. The southern wall is constructed of timber and corrugated iron to enable further expansion.[1]

A small single storey building north of, and separate from, the original boiler room. Four cast iron chutes penetrate the northern wall. This wall is a retaining wall built against an embankment which defines the northern boundary of the pumping station complex. This wall is angled with a buttressed base and weepholes. Concrete steps adjacent to the east lead to the road above. The building contains fire bricks for use in the Electricity Commission boilers.[1]

A lean to roof and western wall of corrugated iron over a timber frame erected between the workshop and boiler room in 1913.[1]

large rectangular tank (220' x 115' x 10') located north west of the pump house complex. The walls are sandstock brick covered with cement render. The floor is concrete. The tank has not been filled and remains largely intact. Several of its associated artefacts and components, including a vertical iron inlet pipe on the eastern side, an outlet and overflow pipes on the southern side and height gauge and ladder remain. A steep, centrally located set of concrete steps lead south down an embankment to the filter beds.

Seven beds were constructed in 3 stages. Beds 1-4 were laid out in a grid fashion around a north/south pipe. All were built of sandstone blocks. Beds 2 and 4 have been damaged by the erection of concrete bases for cooling towers associated with the c. 1950s power station. Beds 1 and 3 have been uncovered and probably remain substantially intact.[1]

Beds 5 and 6 are of different construction, having been added in 1908. They feature off-form concrete walls with pre-cast concrete cappings. Bed 7 was built in 1913 in a similar design to the 1908 beds and is in reasonable condition. The filtration layers of sand, gravel and brick may remain in silt within beds 1,3,5,6 & 7.[1]

Clearwater tank

Of brick construction and located below the filter beds. The brick piers of the rim show evidence of the roof line but iron supports for the roof have been removed. The western side features gate piers with brick caps. The intake, outlet and overflow pipes associated with this tank remain in situ.[1]

The reservoir edges follow the natural land contours on the northern and western sides and are bounded by an earthen embankment made from material excavated during the construction of the tanks, filter beds and pumping station on the southern and eastern ends. Its internal face is lined with Ravensfield sandstone blocks. A brick byewash(4m x 2m) is located at the southern west extremity of the reservoir. It has an arched, buttressed brick face covered with concrete render. The byewash contains a large valve which could be opened to lower or drain the water in the reservoir.[1]

A circular brick structure with an iron trap door is centrally located on the reservoir's north bank and a small valve house is present about 30m from the eastern wall. A discharge cooling tunnel runs parallel with the northern bank.[1]

9 room brick cottage. Substantial footings and rubble, a tennis court and an approach road flanked by introduced trees remain.[1]

Footings of the second engineer's 6 room brick cottage remain.[1]

An isolated stand of an endangered ecological community, Lower Hunter Spotted Gum-Ironbark Forest, has survived in the area because the small catchment around the constructed reservoir lake was bordered for historical civic purposes some 150 years ago and has remained relatively secure in tenure and management since. (spotted gum is Corymbia maculata: ironbark is one of several species of Eucalyptus). The bush component acts as an island and a stepping stone for fauna within the (largely cleared) Hunter Valley. It has some 300 species of bird recorded on this site alone. Four threatened bird species have been recorded here: Australasian bittern (Botaurus poiciloptilus)(endangered); black bittern (Ixobrychus flavicollis)(vulnerable); blue-billed duck (Oxyura australis)(vulnerable) and freckled duck (Stictonetta naevosa)(vulnerable). 18 other threatened fauna species including three more bird species, have been recorded within a 10 km radius of Walka Water Works since January 2000, although their specific presence at Walka has not been determined.[9][1]

An extensive system of concrete paved roads, paths and kerbing installed by the Electricity Commission in the 1950s. Remnants of the planting scheme installed at the site by the Electricity Commission.[1]

A sparse scatter of plantings from the original period of operation, including an avenue of trees near the Chief Engineer's residence.[1]

A substantial railway formation, including cuttings and embankments, runs from the site of the power station along the northern edge of the reservoir and connects to the North Coast railway main line at the western end of the site. Some sections of the railway track remain in situ. A vehicle track follows the railway line.[1]

A cast iron pipe network and a steel pipe network remain.[1]

The steel steps and concrete footings for the fuel air pump house can be seen at the edge of the rail track below filter bed 7.[10][1]

• 1892 - a 3rd pump attached to No.3 beam engine
• 1893 - eastern extension to main pump house
• 1908 - filter beds 5 & 6 built
• 1913 -
  • western pumphouse built
  • boiler room addition between workshop and boiler room
  • pump shed built (now gone - n.d)
  • filter bed 7 built
  • Babcock and Wilcox boilers, steam economiser, feed pumps and accessories and a vertical triple expansion 3 plunger pump engine added
• 1949 - concrete floor installed in western pumphouse after water pumping machinery removed.
• 1950s - Electricity Commission installs amenities in eastern pump house extension and makes alterations to pump house
• 1975 - Second Engineer's cottage demolished[11][12][1]

This Wikipedia article contains material from Walka Water Works, entry number 00466 in the New South Wales State Heritage Register published by the State of New South Wales and Office of Environment and Heritage 2018 under CC-BY 4.0 licence, accessed on 1 June 2018.