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A catchwater drain is a land drain, a ditch cut across the fall of the land, typically just above the level of low-lying, level ground such as
A catchwater drain is a land drain, a ditch cut across the fall of the land, typically just above the level of low-lying, level ground such as The Fens
The Fens or Fenlands in eastern England are a naturally marshy region supporting a rich ecology and numerous species. Most of the fens were drained centuries ago, resulting in a flat, dry, low-lying agricultural region supported by a system o ...
of eastern England
England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...
, where some land, tens of kilometres from the sea is at about sea level
Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more among Earth's coastal Body of water, bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical ...
. Its purpose is to gather water draining from the higher, sloping ground before it reaches the flat land whence it would be difficult or expensive to remove. The water may be on the surface, in streams or in the ground before it is gathered, perhaps to be led away across the lowland by an embanked river.
There are other circumstances in which a catchwater may be employed. A hill-top or hillside may be used to trap rainwater
Rain is a form of precipitation where water droplets that have condensed from atmospheric water vapor fall under gravity. Rain is a major component of the water cycle and is responsible for depositing most of the fresh water on the Eart ...
which is then gathered by the catchwater and fed to a reservoir
A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation.
Reservoirs are created by controlling a watercourse that drains an existing body of wa ...
. From this a house, village or town may be supplied. Catchwater may be used to slow down runoff before running on impervious surface
Impervious surfaces are mainly artificial structures—such as pavements (roads, sidewalks, driveways and parking lots, as well as industrial areas such as airports, ports and logistics and distribution centres, all of which use considerable ...
s to reduce runoff.
See also
*Nullah
A nullah or nala (Hindustani language, Hindustani or "nallah" in Punjabi language, Punjabi) is an 'arm of the sea', stream, or watercourse, a steep narrow valley. Like the wadi of the Arabs, the nullah is characteristic of mountainous or hilly co ...
References
{{DEFAULTSORT:Catchwater Drain Land management