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Flood
 Flood—A flooded airfield.
Flood
When water flows across normally dry land. Both rivers and seas can cause flooding.
On either side of a river channel there is land which has been flattened by the river during previous floods. This is called a flood plain. Anything built on the flood plain—no matter how
far it might be from
the river—will be
flooded from time
to time.
Floods are
not just water.
All floodwaters
carry huge amounts of sediment with them. (See also: Bore; Alluvium; Flash flood; Water cycle.)
(For flood prevention see: Barrage; Dam; Dike; Groin; Levee; Reservoir.)
 Flood—A flood spills out to cover the flood plain. Many normal human activities are disrupted by this, especially communications.
Levee
Town
Bridge
Industry
Road
Levees
Flood plain
The flat land on either side of a river that is made of alluvium deposited by the river in times of flood.
Because flood plains are formed by the action of rivers and floods, they are liable to regular flooding. (See also: Levee and Oxbow, oxbow lake.)
 Flood plain—A flood plain is the flat land on either side of a river.
Flood plain
Ford
A part of a river where it is shallow enough to cross without a boat or a bridge.
Fords are often found in straight stretches of rivers away from bends. These are the places where the river is widest, and the bed is an even depth. At bends the deepest water is found on the outside of the bend. (See also: Braided river.)
Fork
Power cables
One of the headwaters of a river system close to a watershed that is regarded as being the starting point of a river system. An alternative term is branch.
 Ford—This ancient ford allows travelers to cross the river. It is still used by local people when the river level is low.
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