Editing Longdendale (section)

===The reservoirs===
{{Main|Longdendale Chain}}
The Longdendale catchment exceeds {{convert|30|sqmi|km2}} and has an annual rainfall of {{convert|52.5|in|mm|order=flip}}. The civil engineer [[John Frederick Bateman]] recognised the potential and conceived a plan to deliver this water to Manchester and Salford, while still maintaining the flow in the River Etherow that was needed to power the mills of [[Tintwistle]] and [[Glossop]]. The six reservoirs have a capacity of {{convert|4500000000|impgal|m3|abbr=on|order=flip}}.<ref>{{cite web |last1=Durant |first1=M. J. |last2=Counsell |first2=C. J. |date=2018 |title=Inventory of reservoirs amounting to 90% of total UK storage |url=https://doi.org/10.5285/f5a7d56c-cea0-4f00-b159-c3788a3b2b38 |publisher=NERC Environmental Information Data Centre |access-date=20 March 2025}}</ref> A tunnel was built at a depth of {{convert|200|ft|m|-1}} to carry the water from Longdendale into the valley of the [[River Tame, Greater Manchester|River Tame]]. The [[Manchester Corporation Waterworks Act 1847]] ([[10 & 11 Vict.]] c. cciii) (9 July 1847) was passed to allow the land to be acquired and construction to commence.<ref name=quayle>{{cite book
 |title= Manchester's water: the reservoirs in the hills
 |first=Tom
 |last=Quayle
 |pages = 7, 19
 |year= 2006
 |publisher= Tempus
 |location= Stroud
 |isbn= 0-7524-3198-6}}</ref>