The Jumbles Reservoir is a heavily modified, high alkalinity

Alkalinity

Alkalinity or AT measures the ability of a solution to neutralize acids to the equivalence point of carbonate or bicarbonate. The alkalinity is equal to the stoichiometric sum of the bases in solution...

, shallow reservoir

Reservoir

A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

 in North West England

North West England

North West England, informally known as The North West, is one of the nine official regions of England.North West England had a 2006 estimated population of 6,853,201 the third most populated region after London and the South East...

. It lies in Jumbles Country Park

Jumbles Country Park

The Jumbles Country Park is a country park in the town of Bolton in Greater Manchester. It lies on the southern edge of the West Pennine Moors. It was opened on 11 March 1971 by HRH Queen Elizabeth II. The park is now owned and managed by United Utilities....

, in the valley of Bradshaw Brook

Bradshaw Brook

Bradshaw Brook is a river draining parts of Lancashire and Greater Manchester in Northern England.Starting life as Cadshaw Brook draining a valley named Green Lowe Clough on Turton Moor, the brook feeds the Turton and Entwistle Reservoir and Wayoh Reservoir...

, partly in the Metropolitan Borough of Bolton

Metropolitan Borough of Bolton

The Metropolitan Borough of Bolton is a metropolitan borough of Greater Manchester, England. It is named after its largest settlement, Bolton, but covers a far larger area which includes Blackrod, Farnworth, Horwich, Kearsley and Westhoughton, and a suburban and rural element from the West Pennine...

, Greater Manchester

Greater Manchester

Greater Manchester is a metropolitan county in North West England, with a population of 2.6 million. It encompasses one of the largest metropolitan areas in the United Kingdom and comprises ten metropolitan boroughs: Bolton, Bury, Oldham, Rochdale, Stockport, Tameside, Trafford, Wigan, and the...

, and partly in Blackburn with Darwen

Blackburn with Darwen

Blackburn with Darwen is a unitary authority area in Lancashire, North West England. It consists of Blackburn, the small town of Darwen to the south of it, and the surrounding countryside.-Formation:...

, Lancashire

Lancashire

Lancashire is a non-metropolitan county of historic origin in the North West of England. It takes its name from the city of Lancaster, and is sometimes known as the County of Lancaster. Although Lancaster is still considered to be the county town, Lancashire County Council is based in Preston...

. It was opened on 11 March 1971 by HRH Queen Elizabeth II for the then Bolton Corporation Waterworks (since privatisation the reservoir is now owned by United Utilities

United Utilities

United Utilities Group PLC is the UK's largest listed water business. The Group owns and manages the regulated water and waste water network in the north west England, through it subsidiary United Utilities Water PLC , which is responsible for the vast majority of the group's assets and...

). The reservoir's original purpose was to guarantee water for the Croal

River Croal

The River Croal is a river located in Greater Manchester, England. It is a tributary of the River Irwell.Rising at the confluence of Middle Brook and Deane Church Brook, it flows eastwards through Bolton, collecting Gilnow Brook and the larger River Tonge at Darcy Lever...

-Irwell

River Irwell

The River Irwell is a long river which flows through the Irwell Valley in the counties of Lancashire and Greater Manchester in North West England. The river's source is at Irwell Springs on Deerplay Moor, approximately north of Bacup, in the parish of Cliviger, Lancashire...

 river system and the associated industries.

The name Jumbles appeared during the 19th century, it is a variation of dumbles; a northern term for a ravine like valley with wooded sides down which tumbles a fast flowing stream. This reservoir is also fed from the Wayoh

Wayoh Reservoir

Wayoh Reservoir is a water reservoir in the town of Edgworth, Lancashire, England. It was completed on 28 April 1876 to supply water to Bolton. Wayoh, together with the Turton and Entwistle Reservoir, make up 50% of Bolton's drinking water....

 and the Turton and Entwistle

Turton and Entwistle Reservoir

Turton and Entwistle Reservoir is a water reservoir in the town of Edgworth, Lancashire. The reservoir's existence is due to the Entwistle Dam. When constructed in 1832 the Entwistle Dam was the highest in Britain; it rises 108 feet from the base...

reservoirs.