Historic Significance

Historical Significance or Value The Arapuni Dam project was first conceived in 1921 when a definite need for an increased power source for Auckland was recognized. The Minister of Public Works at the time, however, believed that there were insufficient funds for the project and the idea was shelved for two years. After a public outcry tenders were finally called for in 1923, and construction began in 1924. Thus, from the outset Arapuni was seen to be a very big project, surrounded by controversy, but nevertheless one which, for the first time, recognized the Waikato river as a major source of power generation. It has to be said that in 1924 the science of hydro-electric power generation was still in its infancy, and therefore the practical engineering problems that had to be faced and overcome were largely of an experimental nature. The British contractors, Armstrong Whitworth & Co Ltd, clearly had difficulties in constructing adequate foundations for the Powerhouse and this necessitated their retirement from the contract in 1927. From this point on, the work was taken over by the Public Works Department until competition in 1929. It was the first such project taken on by the Public Works and the efficiency with which it was completed was due in no small measure to the fact that Public Works engineers tackled the problem in a systematic manner. The Powerhouse foundations, for instance, were constructed only after the engineers had solved the problem of diverting the river from its course through the construction of diversion tunnels. The credit for this systematic approach was in no small measure due to the expertise of the Engineer-in-Chief, Mr F W Furket; his judgement had ultimately been decisive in saving the project in 1927. The innovation creating diversion tunnels and pumping plants enabled work to continue by properly draining the site. This method worked so successfully that the contract was completed on time with the first generator turning on 4 June 1929. This date therefore marks the first time in which a state-built hydro-electric dam came into service supplying power to the national grid. The science of hydro-electric power generation has, since this time, taken Arapuni as a model, the project being, so to speak, the first in the country to employ eight generators and modern constructional techniques.

Physical Significance

ARCHITECTURAL SIGNIFICANCE: i) In terms of the materials in the construction of the building and its advance functional style, the building is a landmark in the construction of hydro-electric dams and in the industrial use of reinforced concrete. Ii) The actual design was the work of the NZ Public Works Department and in this sense the building , and particularly the engineering solutions arrived at within it, such as the placement of the generators to minimise breakdown failures, is credit to the engineers of 50 years ago. SIGNIFICANCE OF ENGINEERS: Arapuni was the first major hydro-electric power project taken on by the NZ Public Works Department. The previous contractors had not completed their contract to the satisfaction of the Engineer-in-Chief. The apparent lack of organization that had characterised the site up until 1927 was changed dramatically by the efficiency of the Public Works, who earned high public praise for solving major engineering problems without giving up as the British contractors had. LANDMARK SIGNIFICANCE: From occupying what was once a lonely and isolated spot on the Waikato river Arapuni Powerhouse and dam with ancillary works, has become a well-known landmark in the Putaruru district. Apart from the community that has grown up around the dam it is affectionately known by engineers as 'The Old Workhorse of the Waikato', which illustrates its place in the minds of the engineering profession as much as it's physical presence.