071f058e_Dam__Function
[Example] Many urban areas of the world are supplied with water abstracted from rivers pent up behind low dams or weirs. Examples include London - with water from the River Thames and Chester with water taken from the River Dee. Other major sources include deep upland reservoirs contained by high dams across deep valleys such as the Claerwen series of dams and reservoirs. [Function] 
Water supply
P o w e r g e n e r a t i o n
W a t e r s u p p l y
S t a b i l i z e w a t e r f l o w / i r r i g a t i o n
F l o o d p r e v e n t i o n
L a n d r e c l a m a t i o n
W a t e r d i v e r s i o n
N a v i g a t i o n
R e c r e a t i o n a n d a q u a t i c b e a u t y
Dam
Function