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Canning Contour Channel
The Canning Contour Channel is a series of man-made concrete channels and steel and cast-iron pipelines in the Darling Scarp in Western Australia constructed between July 1935 and December 1936.〔(【引用サイトリンク】title=Canning Contour Channel (fmr) )〕 The project was a Depression era public works scheme to carry potable water from just below Canning Dam through the hills around and above Roleystone and Kelmscott to a screening, fluoridation and pumping station near Gosnells by following the natural contours of the Canning Valley—hence it was entirely gravity-fed. Where a tributary valley needed to be crossed, suspended or siphoning pipelines were used. From Gosnells, the water entered the city's pipeline distribution system.
The channel supplied drinking water to the metropolitan area of Perth from 1940 to 1975 before becoming redundant after the construction of the Canning Tunnel in the mid-1970s. Until the construction of Serpentine Dam in 1961, Canning Dam and the channel were the main sources of water supply for Perth. Large sections of the disused channel and associated infrastructure remain and provide useful bush-walking routes.
In 1950 a section of the channel collapsed at Araluen, causing severe water restrictions in Perth for several weeks.
==Course==
The channel starts at a stilling chamber on the north bank of the Canning river, just below the Canning Dam. After just over 200 meters, it enters a siphon to cross the Canning river. It then flows alongside McNess Drive down the Canning valley. A siphon is used to cross McNess Drive near the junction with Bristol Road and it also crosses the Canning river to the North bank. The channel flows to the north of Croyden Road into Roleystone to a point above Brookton Highway, which is crossed with a siphon. The channel continues west, then north-west to cross Peet road between Knuckey Drive and Beales Crescent. It follows Contour Road to the west, and uses a siphon to cross Slab gully. Further channels and siphons continue west to cross Canning Mills Road near Martin Street, and then north, crossing Turner Road on its way to its destination in Martin on Mills Road.〔(【引用サイトリンク】work=City of Armadale )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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