61-664: The Waitaki Dam is one of eight hydroelectric power stations which form the Waitaki hydroelectric scheme on the Waitaki River in the Canterbury Region of New Zealand. The dam was the first of three to be built on the Waitaki River and was constructed without earthmoving machinery; over half a million cubic metres of material was excavated, almost entirely by pick-and-shovel. The Waitaki Dam's construction
122-525: A trellis bridge being erected across the river and completed in December 1928. This enabled the construction of several cofferdams so that the foundations of the dam could be excavated and concrete subsequently poured. The construction of the first cofferdam was a narrow dam section in the centre of the river. This was followed by the cofferdam on the Canterbury (north) side of the river and restricted
183-545: A further two generators were added between 1952 and 1954. With seven generators each delivering 15 MW, the total generative output of the Waitaki Dam is 105 MW. The first State-built power station in New Zealand was constructed at Lake Coleridge in 1915 – designed to supply Christchurch and any additional consumer demand within reach of the transmission system. Consumers quickly tapped into this low-cost energy and
244-414: A gad ( digging bar ) and sledge hammer. Men did most of the overburden stripping and loading by hand-shovel, but used an Osgood dragline when the excavation was from deeper water. The lack of heavy earthmoving equipment during the dam's construction meant that pick, shovel and wheel barrow were commonly used, although trucks run on light railways around the dam site were used extensively. Construction of
305-466: A general service to members of the Association and their families for a small subscription. The doctor for much of the project was Gervan McMillan , a young idealist who worked tirelessly for the Association and was to play an integral role in the development of the social welfare system trialled at Waitaki. McMillan, along with Arnold Nordmeyer , Kurow's Presbyterian Minister, and Andrew Davidson ,
366-523: A rapid completion was unrealistic. Packwood's first task was to extend a spur from the Kurow Branch railway line to the dam site – a simple 6 km (3.7 mi) extension which was approved and surveyed in August 1928, with Public Works Department traffic operating on the line by December 1928. With the railway and the existing gravel road from Kurow ( SH83 ) providing equipment and material access,
427-666: A social security system. This was adopted as the basis for New Zealand's national social welfare scheme, which was implemented in 1939 by the Savage Government . The construction of the Waitaki Power Station therefore played an important role in the origin of New Zealand's present Social Security system . Hydroelectricity Too Many Requests If you report this error to the Wikimedia System Administrators, please include
488-410: A station generative capacity of 75 MW, although initially only two 15 MW generators and turbines were ordered. Early designs of the dam, in large part due to the infancy of hydroelectric engineering in New Zealand, had potentially serious flaws. In particular, there was no consideration of the pressure exerted by the hydrostatic head and impact of water entering cracks or joints in either the basement or
549-474: A turbine had been tested and commissioned. Instead, when the Governor-General threw the switch, lamps in the powerhouse were slowly lit using power from Coleridge. The turbines were tested and commissioned with full power being turned on 1 January 1935. Finalisation work on the dam continued through to July 1935 with sealing of the temporary sluice gates and removal of most of the framework supporting
610-709: A whole. During the Last Glacial Period when sea levels were over 100 metres lower than present day levels, the North and South islands were connected by a vast coastal plain which formed at the South Taranaki Bight . During this period, most of the North Island was covered in thorn scrubland and forest , while the modern-day Northland Peninsula was a subtropical rainforest . Sea levels began to rise 7,000 years ago, eventually separating
671-465: Is in the North Island", "my mother lives in the North Island". Maps, headings, tables, and adjectival expressions use North Island without "the". According to Māori mythology , the North and South Islands of New Zealand arose through the actions of the demigod Māui . Māui and his brothers were fishing from their canoe (the South Island) when he caught a great fish and pulled it right up from
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#1732779878362732-474: Is one of the two main islands of New Zealand , separated from the larger but less populous South Island by Cook Strait . With an area of 113,729 km (43,911 sq mi), it is the world's 14th-largest island , constituting 43% of New Zealand's land area. It has a population of 4,077,800 (June 2024), which is 76% of New Zealand's residents, making it the most populous island in Polynesia and
793-448: The 28th-most-populous island in the world. Twelve main urban areas (half of them officially cities) are in the North Island. From north to south, they are Whangārei , Auckland , Hamilton , Tauranga , Rotorua , Gisborne , New Plymouth , Napier , Hastings , Whanganui , Palmerston North , and New Zealand's capital city Wellington , which is located at the south-west tip of the island. The island has been known internationally as
854-469: The Mackenzie Basin into Lake Benmore before forming the Waitaki River. Several bedrock gorges, separated by small tectonic basins , lie beneath the string of artificial lakes (Benmore, Aviemore, Waitaki) occupying the middle reaches of the fault-controlled Waitaki Valley. Downstream of Kurow, the valley widens to a plain, with paired alluvial terraces on either side of a braided river channel. At
915-566: The North Island for many years. The Te Reo Māori name for it, Te Ika-a-Māui , also has official recognition but it remains seldom used by most residents. On some 19th-century maps, the North Island is named New Ulster (named after Ulster province in northern Ireland) which was also a province of New Zealand that included the North Island. In 2009 the New Zealand Geographic Board found that, along with
976-427: The weir on 28 September 1934. The completed dam had been constructed with 175,850 m (6,210,000 cu ft) of concrete in the primary superstructure, plus an additional 38,225 m (1,349,900 cu ft) of concrete for the powerhouse. Construction of the powerhouse had proceeded synchronously with the dam. The vast majority of the plant to be installed in the powerhouse was constructed overseas due to
1037-590: The 2023 census, 63.1% of North Islanders identified as European ( Pākehā ), 19.8% as Māori , 10.6% as Pacific peoples , 19.3% as Asian , 1.9% as Middle Eastern/Latin American/African, and 1.1% as other ethnicities. Percentages add to more than 100% as people can identify with more than one ethnicity. Māori form the majority in three districts of the North Island: Kawerau (63.2%), Ōpōtiki (66.2%) and Wairoa (68.5%). Europeans formed
1098-471: The District Engineer in charge of the dam's construction. Packwood's task was to get the power station operational as quickly as possible and involved the completion of the dam across the Waitaki River followed by installation, testing and commissioning of the electrical and mechanical equipment. Given an overly ambitious goal of an operational power station by 1931, it soon became obvious that such
1159-612: The Dryburgh Fault was recognised as an issue, particularly when excavating the Hörnell Gallery. Basement rock had been reduced to gouge across the fault zone which was remediated by excavating and successfully cementing the gouge zone deeper than the competent rock either side of the fault. When the final Awakino site was selected for the dam, the Public Works Department engaged Roland Packwood as
1220-462: The Government's make work scheme and saw the trial of medical welfare where an individual could build a satisfactory life without fear of the inability to cope with age or poverty. Initial construction of the dam began in 1928 and was completed in 1934 with full power being delivered from two 15 MW generators on 1 January 1935. Three additional generators were added between 1940 and 1949 and
1281-524: The Minister of Works and local MP , John Bitchener and Leader of the Opposition, Michael Joseph Savage . The opening extended to some 300 invited guests who were seated for lunch in the powerhouse – an easy accommodation given only two of the proposed five generators were installed at the time. The official 'switching on' of the power was not possible as testing had not proceeded to the point at which
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#17327798783621342-529: The Otago side (south) of the Waitaki River was of concern to engineers who felt it may act as a leak point beneath any proposed dam. Subsequently, a site further downstream, near the confluence with the Awakino River, was investigated and found to be suitable. The Awakino site, 6 km (3.7 mi) above Kurow , had only 5 m (16 ft) of shingle to remove before solid basement was reached, reducing
1403-519: The South Island, the North Island had no official name. After a public consultation, the board officially named it North Island, or the aforementioned Te Ika-a-Māui, in October 2013. In prose, the two main islands of New Zealand are called the North Island and the South Island , with the definite article. It is also normal to use the preposition in rather than on , for example "Hamilton
1464-437: The South Island, this is solely due to the North Island having higher natural increase (i.e. births minus deaths) and international migration; since the late 1980s, the internal migration flow has been from the North Island to the South Island. In the year to June 2020, the North Island gained 21,950 people from natural increase and 62,710 people from international migration, while losing 3,570 people from internal migration. At
1525-462: The South Island, with the country's largest city, Auckland, and the capital, Wellington, accounting for nearly half of it. There are 30 urban areas in the North Island with a population of 10,000 or more: The sub-national GDP of the North Island was estimated at NZ$ 282.355 billion in 2021 (78% of New Zealand's national GDP). Nine local government regions cover the North Island and its adjacent islands and territorial waters. Healthcare in
1586-584: The Waitaki Dam, the Waitaki River occupies a fault-angle depression between the greywacke of South Canterbury and the schist of North Otago . The valley fill comprises a sequence of Quaternary river and glacial outwash gravels that overlies Upper Tertiary sedimentary strata, which in turn overlies the Mesozoic basement. Both basement and covering sediments have been affected by late Quaternary faulting, including reactivation of earlier Cretaceous fault systems. Geodetic results indicate that strain rates in
1647-464: The Waitaki area suggest that the recurrence interval of large earthquakes is on the order of thousands or tens-of-thousands of years. The primary fault associated with the Waitaki Dam is the Dryburgh Fault; this fault has been noted as having a considerably long recurrence interval of >62 000 years. While the impacts of regional faulting at the time of the dam's construction were not well understood,
1708-466: The Waitaki's flow by about half leading to half of the trellis bridge being swept away during a flood in early 1929. The trellis bridge was repaired allowing the construction of eleven temporary sluice gates to control river flow during construction of the remainder of the dam. Excavation began near the Otago abutment for the powerhouse and intake section of the dam with overburden stripped and necessary blasting of rock. Blast-holes were hand-drilled using
1769-404: The base of the dam has persisted: further measures to alleviate this issue were introduced in the early 1960s when anchoring cables were drilled from the dam crest into the foundation rock, and again in 2016 when drainage holes were drilled in the foundation of the dam. The Ahuriri, Ōhau, Pukaki and Tekapo rivers rise in glaciated catchments which feed the Waitaki River. These tributaries flow from
1830-411: The circumnavigation of New Zealand. The maps described the North Island as " Ea Heinom Auwe " and " Aeheinomowe ", which recognises the "Fish of Māui" element. Another Māori name that was given to the North Island, but is now used less commonly, is Aotearoa . Use of Aotearoa to describe the North Island fell out of favour in the early 20th century, and it is now a collective Māori name for New Zealand as
1891-451: The conclusion of the Otago gold rush in the 1860s, New Zealand's European population growth has experienced a steady 'Northern drift' as population centres in the North Island have grown faster than those of New Zealand's South Island. This population trend has continued into the twenty-first century, but at a much slower rate. While the North Island's population continues to grow faster than
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1952-569: The dam itself. The downstream slope of the dam was also considered too steep compared to European dams at a ratio of 3:2. Seepage troubles at the North Island's Arapuni Power Station in 1929 caused additional concerns and resulted in a Swedish hydroelectric engineer, Professor Per Hörnell [ sv ] , being brought to New Zealand in 1930. While Professor Hörnell was specifically brought in to consult on remediation measures to be made at Arapuni, he also visited several other hydroelectric sites, including Waitaki. Despite most column inches at
2013-536: The dam used concrete formed from river gravel aggregate. Concrete was poured into a series of blocks that varied in length, but averaged about 50 ft (15m). Construction continued at pace until 3 February 1931 when flooding caused considerable delays. The Depression forced a reduction in workforce which further hampered construction. Workers were reduced from 1230 in December 1930 to 1000 in early 1931 and further reduced to about 500 in June 1932. The Depression also reduced
2074-417: The demand for power making completion of the dam less critical, but this was reversed in 1933 when power demand began to increase once again. The Government re-engaged as many unemployed men as possible, increasing the workforce to 900 in early 1934; this number was steadily reduced from August 1934 as the dam's construction reached completion. As the dam neared completion (the last of the dam's concrete blocks
2135-399: The details below. Request from 172.68.168.150 via cp1114 cp1114, Varnish XID 919383293 Upstream caches: cp1114 int Error: 429, Too Many Requests at Thu, 28 Nov 2024 07:44:39 GMT North Island The North Island ( Māori : Te Ika-a-Māui [tɛ i.kɐ ɐ mɑː.ʉ.i] , lit. 'the fish of Māui', officially North Island or Te Ika-a-Māui or historically New Ulster )
2196-447: The earlier construction of the dam. The final damaged sluice gates would not be finally sealed off until 18 September 1936 when the water levels were low enough to ensure the sluices could be completely blocked. With the reservoir filled, the Waitaki dam has a hydrostatic head of 21 m (69 ft). The initial implementation of two turbines and generators limited the dam's operational output to 30 MW (15 MW per generator). In 1935 this
2257-401: The early 1920s meaning that resettlement would be a very minor issue following inundation by the dam's reservoir. Initial site investigations began in 1925 and would take over two and a half years before a final site was selected. The focus by 1927 was in the vicinity of Wharekuri/Roseneath (between Aviemore and Waitaki dams) which appeared to be most favourable. However, the presence of coal on
2318-492: The flow into the Waitaki River's headwaters, flooding was not expected to exceed 5380 cumecs , a low threat to the safety of any proposed dam. In its middle reaches, the Waitaki River flows through bedrock gorges of low-grade schists , meta-greywackes and greywackes of the Rakaia Terrane. These gorges offered good dam sites with relatively stable rock upon which to build. The Waitaki River was also sparsely populated in
2379-418: The future, while junior staff and single men were accommodated in wooden houses and huts. In all, the Public Works Department were to construct approximately 350 houses and another 700 huts which were primarily located on two river terraces on the true right river bank (south or Otago-side of the river) immediately upstream of the dam. There were four separate living areas in the wider camp: the main camp occupied
2440-581: The headmaster of Kurow School, all had to deal with problems stemming from the Depression. All three were deeply concerned with the problems of health, family, unemployment with its consequent poverty, and old age. Between them, they drafted a system where any individual could build a life without excessive fear of disaster or inability to cope with such problems that may occur during their lifetime. When McMillan and Nordmeyer entered Parliament in 1935 as Cabinet Ministers, they brought with them their draft for
2501-660: The islands and linking the Cook Strait to the Tasman Sea . The North Island has an estimated population of 4,077,800 as of June 2024. The North Island had a population of 3,808,005 at the 2023 New Zealand census , an increase of 213,453 people (5.9%) since the 2018 census , and an increase of 570,957 people (17.6%) since the 2013 census . Of the total population, 733,893 people (19.3%) were aged under 15 years, 743,154 (19.5%) were 15 to 29, 1,721,427 (45.2%) were 30 to 64, and 609,534 (16.0%) were 65 or older. Ever since
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2562-572: The lack of specialised manufacturing capability within New Zealand at the time. The installation of the first two turbines and generators (20,000 hp each) was completed by the end of 1933, and the wiring testing and commissioning in 1934. The Waitaki dam was officially opened on the 27 October 1934 by the Governor-General Lord Bledisloe . In attendance with Lord Bledisloe was the Prime Minister, George Forbes ,
2623-516: The lower Canterbury region are low to very low, though strain increases considerably toward the west and proximity with the Alpine Fault . The Waitaki region, along with the rest of the south-eastern South Island , has had a low level of large earthquake occurrences in historic times, with one of the largest recorded earthquakes (M5.8) in the vicinity of the Waitaki Dam occurring near Oamaru in 1876. Paleoseismic studies on individual faults in
2684-693: The overall volume of material to be excavated. The final site (Awakino) having been selected for the Waitaki Dam was announced by the Government in April 1928, with an overly ambitious target for completion by 1931. The investigations of the Roseneath site were not in vain either – Roseneath would later be adopted as the site of the Aviemore Dam . Engineers calculated that the Awakino site, backed-up by several years of Waitaki River flow records, would support
2745-470: The plurality in the Auckland region (49.8%) and are the majority in the remaining 39 districts. The proportion of North Islanders born overseas at the 2018 census were 29.3%. The most common foreign countries of birth were England (15.4% of overseas-born residents), Mainland China (11.3%), India (10.1%), South Africa (5.9%), Australia (5.5%) and Samoa (5.3%). The North Island has a larger population than
2806-434: The powerhouse building roof was also undertaken to ensure it could withstand a major earthquake. Meridian Energy envisages a further phase of upgrades worth $ 90 million being required to replace four of the station's original generation units. Worker safety during the construction of the Waitaki Dam was very limited. Nine men were reported to have died during the construction of the dam; three men died in accidents related to
2867-638: The project was able to start in earnest. Before any major works at the Waitaki site were undertaken, a camp was required to accommodate up to 1000 workers in addition to their families (up to 2000 people in total). The harsh climate of the Waitaki Valley with its cold winters and strong winds, plus the long-term nature of the project, meant the Public Works Department opted for more permanent wooden accommodation in favour of their typical use of canvas tents. Senior staff were allocated houses built of concrete blocks which would become permanent staff quarters in
2928-423: The refurbishment project saw the drilling of drainage holes in the foundation of the dam to relieve the hydrostatic pressure first raised as a concern by Professor Hörnell in 1930. The station's No. 3 generation unit was also recommissioned during this time: the generator's stator, the single largest component at 120-million tonnes, seized in 1998 and proved uneconomic to return to service at the time. Strengthening of
2989-452: The same time. With seven generators each delivering 15 MW, the total generative output of the Waitaki Dam is 105 MW. Following the installation of the seventh and final generator in 1954, the Waitaki power station had seen no further major upgrades until 2013. Starting in April 2013, a four-year $ 40 million refurbishment of the Waitaki power station was undertaken by Meridian Energy . After almost eighty years of continuous operation, part of
3050-486: The sea. While he was not looking, his brothers fought over the fish and chopped it up. This great fish became the North Island, and thus a Māori name for the North Island is Te Ika-a-Māui ("The Fish of Māui"). The mountains and valleys are believed to have been formed as a result of Māui's brothers' hacking at the fish. During Captain James Cook 's voyage between 1769 and 1770 , Tahitian navigator Tupaia accompanied
3111-468: The time focussing on the exorbitant £4000 consultant's fee charged by Professor Hörnell, his comments on the Waitaki were that its cross section was too narrow and that measures should be incorporated to ensure adequate foundation drainage. Notwithstanding the Government's decision not to invest in a specific Waitaki Dam report from Professor Hörnell, several design modifications were made on the basis of his comments: Despite these additions, Professor Hörnell
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#17327798783623172-399: The upper terrace, 'Siberia' was located on the lower river terrace (so-named because it was exposed to the cold winds), 'Geddesville' was located downstream from the construction site, and 'Willows', located close to the Awakino bridge. In addition to accommodation, the camp included a YMCA hall, post office, small shops, tennis courts and a football ground. At the dam's completion, the camp
3233-421: The use of heavily laden trucks on the dam's steeply-inclined sections of light railway, while another three drowned in the river. Accidents were extremely prevalent – in one year alone, 540 cases of injuries were reported, although the severity of these injuries is unknown. By way of comparison and considering a worker population of approximately 1000 at Waitaki, the incidence rate of all injury claims in New Zealand
3294-400: The village as a historic area in 1995. After passing through several owners it went up for sale in 2015 but languished unsold for several years. Interest in purchasing Lake Waitaki village was rejuvenated in 2018, when global media outlets caught hold of the story that a village was up for sale. Lake Waitaki village now serves as accommodation for vacation rentals. Dam construction began with
3355-401: The year-on-year load increase for Coleridge was 15%; by the 1920s a new power source was needed. The Waitaki River was selected as the most promising source of hydro-electric power, particularly for long-term needs – the New Zealand government having recognised the electricity generation potential of the Waitaki Valley as early as 1904. With Lakes Ōhau , Pukaki and Tekapo controlling 80% of
3416-536: Was 87 claims per 1000 full-time equivalent employees in 2022. In Public Works Department camps large-enough to warrant it, a medical association with resident doctor and/or nurse would be supplied. At the start of the Waitaki Dam project, the camp numbers did not justify a resident nurse so the doctor's surgery at Kurow was used. On 1 November 1928, the Waitaki Hydro Medical Association was formed in agreement with Kurow's doctor to provide
3477-477: Was dismantled apart from the permanent structures of Lake Waitaki village which were occupied by the permanent dam staff. When the Electricity Corporation of NZ (ECNZ) moved its staff out in the 1980s, the remaining concrete block houses, hostel and environs were threatened with demolition. However, pressure from the community resulted in a heritage covenant with Heritage New Zealand to protect
3538-482: Was followed by the development of Aviemore Dam and Benmore Dam , and importantly, every dam built in New Zealand since the Waitaki has benefited from lessons learned during its construction. The Waitaki Dam is unique; its construction lead to the germination of one of the world's first social welfare systems . Built during the Great Depression , the Waitaki Dam attempted to soak up unemployment as part of
3599-406: Was not completely satisfied and his last communication with the Minister of Public Works was to disclaim any responsibility for any future troubles that might occur. Nevertheless, his visit to Waitaki had the significant result of introducing New Zealand engineers to the problem of dealing with water under pressure within the actual structure of a dam. Concern over the possibility of uplift forces on
3660-458: Was poured in mid-June 1934), closure and concreting of the temporary sluice gates began in July 1934. The last sluice gates were not lowered until September 1934, although not without incident – the gates breaking their supporting beams as they were lowered. Despite the last three sluice gates not having stopped head pond water flowing past them completely, the dam continued to fill, finally overtopping
3721-455: Was sufficient to supply half of the South Island's energy requirements. Three additional generators were added between 1940 and 1949 and a further two generators were added between 1952 and 1954. During the phase of work to add the final two generators, the powerhouse was extended from 109 m (358 ft) length to its present length of 152 m (499 ft) to accommodate the new generators. A new inlet and outlet channel were constructed at
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