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A manhole cover for a sanitary sewer access point. View looking down into an open manhole showing two converging sanitary sewer lines. The larger line enters from the right and changes direction within the manhole to exit from the top of the photo. A smaller line enters from the bottom of the photo under the access steps.
A sanitary manhole under construction. A sanitary manhole (sewer manhole, [1] sanitary sewer manhole [2] or sewer maintenance hole [3]) is a manhole that is used as an access point for maintenance and inspection of an underground sanitary sewer system. Sanitary manholes are sometimes used as vents to prevent the buildup of pressurized sewage ...
A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.
Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially where cover theft is of concern ...
The National Water Supply and Drainage Board (commonly abbreviated as NWSDB) is the National Organization responsible for the provision of safe drinking water and facilitating the provision of sanitation to the people in Sri Lanka. The organization had its beginning as a subdepartment under the Public Works Department for water supply and drainage.
Anuradhapura District, Sri Lanka: Type: Reservoir: Primary outflows: Transferred water to Thisa Wewa via Jaya Ganga: Basin countries: Sri Lanka: Surface area: 7 square miles (18.1 km²) at full capacity: Water volume: 123 million cubic meters (4 billion cubic feet) Shore length 1: 40 miles (64.4 km) 1 Shore length is not a well-defined measure.
Sri Lanka-China relations started as soon as the People's Republic of China was formed in 1949. The two countries signed an important Rubber-Rice Pact in 1952. [247] Sri Lanka played a vital role at the Asian–African Conference in 1955, which was an important step in the crystallisation of the NAM. [248]
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