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Wraysbury Reservoir is a water supply reservoir for London, just west of the M25 near the village of Wraysbury, and directly under the western approach path of Heathrow Airport. Construction of the reservoir was begun in 1967 and completed by W. & C. French in 1970 [ 2 ] with a capacity of 34,000 million litres (8,000 million gallons).
The works were extended in 1967 to treat 1.14 million cubic metres per day of sewage, although they were capable of accepting a flow of 2.6 million cubic metres per day. These works cost £21 million (equivalent to £481,000,000 in 2023).
As of 2022, Thames Water extracts, treats and supplies 2.5 billion litres (550 million imperial gallons) of drinking water per day using 97 water treatment works, 308 clean water pumping stations and 31,100 km (19,300 mi) of managed water mains to 10.2 million customers (4 million properties) across London and the Thames Valley. [68]
It is comparable to other bottled cheap beverages (soda, beer, ...). Retail prices vary widely between countries, brands, bottle sizes (0.33 liter to 20 liters) and place of sale (supermarket, fair, restaurant etc.). They range from US$0.05 to US$6 per liter, equivalent to US$50 to US$6,000 per cubic meter.
The Long Reach sewage treatment works is located in Dartford, Kent adjacent to the River Thames. It treats the sewage from a population of 837,000 in a catchment area of 518 km 2 (200 sq mi) in south and south east London and west Kent. The treatment capacity of the works is 346 million litres per day (Ml/d).
It owns more than 20,000 miles of water mains and more than 68,000 miles of sewers across London, the Thames Valley and the Home Counties, with approximately 8,000 employees.
According to a 2006 survey by NUS consulting the average water tariff (price) without sewerage in the U.K. for large consumers was the equivalent of US$1.90 per cubic metre. This was the third-highest tariff among the 14 mostly OECD countries covered by the report.
The peak energy consumption of the plant is 17.6 MW in worst-case conditions, and the average power consumption was estimated at 14 MW, which results in an energy usage of 2.27 kWh per cubic metre of water produced. [12] In 2022, Thames Water revised the usable output of the plant down to 100 megalitres per day, because of "unrealistic ...