|
Grahamstown Dam is a major off-stream earthfill Embankment dam with a controlled labyrinth spillway and baffle chute that stores water from the Williams River. The dam is located north of Newcastle and within the Port Stephens Council local government area in the Lower Hunter Region of New South Wales, Australia. The dam's main purpose is water supply; it provides about 40 per cent of the potable water for the Hunter region; and is the Hunter's largest drinking water supply dam. The impounded reservoir is called the Grahamstown Lake, the Grahamstown Swamp, or the Grahamstown Storage Reservoir. ==Location and features== Grahamstown Dam is immediately adjacent to residential areas in the town of Raymond Terrace, less than from the Raymond Terrace CBD. Commenced in 1955, completed in 1965, and commissioned in 1969, Grahamstown Dam is a major dam that receives its main inflow from the Williams River as well as its own catchment. Water flows into the Grahamstown Dam via the Weir, that limits the inflow of tidal seawater; Balickera Canal and pumping station, which are used to transfer water from the Williams River to Grahamstown Dam; Pumping Station; George Schroder Pumping Station and delivery mains, which are used to deliver water from the dam to the water treatment plant; and Grahamstown Water Treatment Plant.〔 The storage was formed by building an embankment across the outlet of a natural depression known as the Grahamstown Moors. Construction began in 1955, and although all the elements of the entire scheme were not completed until 1965, water was first supplied in 1960 during the severe drought from 1960 to 1963. The dam was built by the NSW Water Conservation and Irrigation Commission on behalf of the Hunter Water Corporation to supply water to the Hunter Region. The dam wall consists of of earthfill with an internal earth core. It is high and long. At 100% capacity the dam wall holds back of water.〔 The surface area of Grahamstown Lake is and the catchment area is a relatively small . The controlled labyrinth spillway is capable of discharging .〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Grahamstown Dam」の詳細全文を読む スポンサード リンク
|