Ardleigh Reservoir is a lake near

Colchester Colchester ( ) is a city in northeastern Essex, England. It is the second-largest settlement in the county, with a population of 130,245 at the 2021 United Kingdom census, 2021 Census. The demonym is ''Colcestrian''. Colchester occupies the ...

Essex Essex ( ) is a Ceremonial counties of England, ceremonial county in the East of England, and one of the home counties. It is bordered by Cambridgeshire and Suffolk to the north, the North Sea to the east, Kent across the Thames Estuary to the ...

, England constructed in the valley of the Salary Brook. It supplies water both to

Anglian Water Anglian Water Services Limited is a water company that operates in the East of England. It was formed in 1989 under the partial privatisation of the water industry. It provides water supply, sewerage and sewage treatment to the area formerly ...

and to

Affinity Water Affinity Water Limited is a UK supplier of drinking water to 3.8 million people in parts of London, eastern and south eastern England. The company is owned by a consortium of Allianz, HICL and DIF Tamblin. History Affinity Water was establish ...

. The lake is also used for recreational activities including

sailing Sailing employs the wind—acting on sails, wingsails or kites—to propel a craft on the surface of the ''water'' (sailing ship, sailboat, raft, Windsurfing, windsurfer, or Kitesurfing, kitesurfer), on ''ice'' (iceboat) or on ''land'' (Land sa ...

and

angling Angling (from Old English ''angol'', meaning "hook") is a fishing technique that uses a fish hook attached to a fishing line to tether individual fish in the mouth. The fishing line is usually manipulated with a fishing rod, although rodless te ...

History

The South Essex Waterworks Company, the Southend Waterworks Company and several other water undertakings in Essex sought powers in 1969 to increase the security of the supply of drinking water. A draft Water Order was made and a public inquiry was held in December 1969. The Essex River and South Essex Water Act 1969 received Royal Assent on 25 July 1969. Under the terms of the Act the Essex River Authority constructed the Cattawade Barrage Works to prevent salt water entering the lower reaches of the River Stour. The South Essex Waterworks Company built a water intake upstream of the barrage, a pumping station at Brantham, and a pipeline to the new Ardleigh reservoir. The South Essex Waterworks Company and the Southend Waterworks Company merged to form the Essex Water Company in 1970.

Operation

The reservoir is operated by the Ardleigh Reservoir Committee which is owned jointly by Affinity Water (formerly

Veolia Water East Veolia Water East, formerly known as Tendring Hundred Water Services, was a privately owned company supplying water to the Tendring peninsula in north east Essex within an area of . In July 2009, the company, a subsidiary of Veolia Water UK sin ...

) and

. The reservoir receives large volumes of water from the East Mills intake (51°53'28.8"N 0°54'54.8"E) on the River Colne and the Northern and Western Salary Brooks in the direct reservoir catchment of about 12 km². The River Colne's catchment area is approximately 256 km². The associated Ardleigh water treatment works (51°54'59.3"N 0°57'43.3"E), treats and supplies 14 million litres per day of drinking water to 133,000 customers. The treatment plant has included

Dissolved Air Flotation Dissolved air flotation (DAF) is a water treatment process that clarifies wastewaters (or other waters) by the removal of suspended matter such as oil or solids. The removal is achieved by dissolving air in the water or wastewater under pressure an ...

(DAF), Granular Activated Carbon (GAC) filters, ozone dosing, Rapid Gravity Filters (RGF) and Actiflo technology. The peak output of Ardleigh treatment works is 36 million litres per day (2018). In 2011 SRC Aggregates planned to remove 4 million tonnes of gravel from a site adjacent to the Ardleigh reservoir to eventually create a new reservoir of capacity. Gravel extraction was thought to take 15 years.

Recreation

Both game and coarse fish are present including

pike Pike, Pikes or The Pike may refer to: Fish * Blue pike or blue walleye, an extinct color morph of the yellow walleye ''Sander vitreus'' * Ctenoluciidae, the "pike characins", some species of which are commonly known as pikes * ''Esox'', genus of ...

and

zander The zander (''Sander lucioperca''), sander or pikeperch, is a species of ray-finned fish from the Family (biology), family Percidae, which also includes perch, Gymnocephalus, ruffe and Darter (fish), darter. It is found in freshwater and brackis ...

. Ardleigh Reservoir is also home to the University of Essex Rowing Club.

References

Reservoirs in Essex Drinking water reservoirs in England {{UK-lake-stub