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The Rochdale Canal is a navigable broad canal in Northern England, between Manchester and Sowerby Bridge, part of the connected system of the canals of Great Britain. Its name refers to the town of Rochdale, in Greater Manchester, through which it passes. The Rochdale is a broad canal because its locks are wide enough to allow vessels of 14 feet width. The canal runs for across the Pennines from the Bridgewater Canal at Castlefield Basin in Manchester to join the Calder and Hebble Navigation at Sowerby Bridge in West Yorkshire. As built, the canal had 92 locks. Whilst the traditional lock numbering has been retained on all restored locks, and on the relocated locks, the canal now has 91. Locks 3 and 4 have been replaced with a single deep lock, Tuel Lane Lock, which is numbered 3/4. ==History== The Rochdale Canal was conceived in 1776, when a group of 48 men from Rochdale raised £237 and commissioned James Brindley to conduct a survey of possible routes between Sowerby Bridge and Manchester. Brindley proposed a route similar to the one built, and another more expensive route via Bury. Further progress was not made until 1791, when John Rennie was asked to make a new survey in June, and two months later to make surveys for branches to Rochdale, Oldham and to a limeworks near Todmorden. Rennie at the time had no experience of building canals. The promoters, unsure as to whether to build a wide or a narrow canal, postponed the decision until an Act of Parliament had been obtained. The first attempt to obtain an act was made in 1792, but was opposed by mill owners, concerned about water supply. Rennie proposed using steam pumping engines, three in Yorkshire, eight in Lancashire, and one on the Burnley Branch, but the mill owners argued that 59 mills would be affected by the scheme, resulting in unemployment, and the bill was defeated. In September 1792, William Crosley and John Longbotham surveyed the area in an attempt to find locations for reservoirs which would not affect water supplies to the mills. A second bill was presented to Parliament, for a canal which would have a tunnel and 11 reservoirs. Again the bill was defeated, this time by one vote. The promoters, in an attempt to understand the mill owners' position, asked William Jessop to survey the parts of the proposed canal that were causing most concern. Jessop gave evidence to the Parliamentary committee, and on 4 April 1794 an act was obtained which created the Rochdale Canal Company and authorised construction.〔(Calderdale.gov.uk website- Roachdale canal act of Parliament )〕 Rennie's estimated cost in the second bill was £291,000, and the company was empowered to raise the money by issuing shares, with powers to raise a further £100,000 if required. The estimate was for a narrow canal, whereas the act authorised a broad canal, and so the capital was never going to be adequate. The summit tunnel was abandoned in favour of 14 additional locks saving £20,000. Jessop proposed constructing each lock with a drop of , resulting in efficient use of water and the need to manufacture only one size of lock gate. The canal opened in stages as sections were completed, with the Rochdale Branch the first in 1798 and further sections in 1799. The bottom nine locks opened in 1800 and boats using the Ashton Canal could reach Manchester. Officially, the canal opened in 1804, but construction work continued for more three years.〔 A branch from Heywood to Castleton opened in 1834.〔 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「Rochdale Canal」の詳細全文を読む スポンサード リンク
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