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• designation of special “no-go” areas; • strategies to limit waterway siltation and erosion; • considerations for drainage and the disposal of effluent; • guidelines for drilling and blasting; • the removal of litter and rubbish; and • fire management. Parts of the King River Valley, now inundated by Lake Burbury, have a rich history associated with the North Mt Lyell Mining Company, which built a railway from Macquarie Harbour to the mine via a village and copper smelter at Crotty (see Map 2). The village had a population of 900 in 1900, but virtually disappeared overnight when the smelter failed to produce any metal, and was uninhabited at the time of dam construction and subsequent inundation. Relics of that era have been recorded in an archaeological study commissioned by Hydro Tasmania. A considerable effort was devoted to the sensitive issue of studying the potential impact of the inundation of the King River valley on Aboriginal heritage. Expert external archaeological resources of natural repute were engaged to investigate and report on this potential impact, with findings carefully and exhaustively chronicled. The investigations proceeded with the involvement of representatives of the Aboriginal community. The findings of these comprehensive studies were provided to the Aboriginal community and the authorities with legislative authority to approve or prevent the inundation of the valley. As a result of this, the permit to inundate the valley was issued without delay. The following technical features of the dam and associated infrastructure were chosen to lessen their impact on the environment or as cost-saving strategies. • The dam’s chute spillway is located on the downstream face of the embankment. This choice eliminated any scarring on the adjacent environment. • Long headrace tunnels are normally excavated from the downstream end on a gradually rising grade so that water inflows can drain away. In contrast the King headrace tunnel was excavated from upstream resulting in a tunnel intake that is permanently submerged with the highest point in the tunnel near its downstream end. • Where the headrace tunnel becomes the power tunnel and descends to the power station, a vertical surge shaft would normally be provided. The cost of a surge shaft was avoided by constructing a tunnel rising to the surface at road grade from this point. Surges take place in the access tunnel, which also meets the need for road access when inspection or maintenance is required.PDF Image | Organisations in Different Renewables
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