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Detention dams are built to catch surface runoff to prevent floods and trap sediment by regulating the flow rate of the runoff into channels downstream. Diversion dams are used to raise the water level in order to redirect the water to the designated location. The diverted water can be used for supplying irrigation systems or reservoirs. [3]
When the region spun out of its wet spell, the Colorado was found to have a maximum sustainable runoff of perhaps 14.5 to 16 million acre-feet (17.9 to 19.7 km 3) per year. This great reduction in water supply spurred Southern California to look north to the Sacramento–San Joaquin river system for water. However, most of the water in these ...
Weir on Lake Tecumseh, Virginia. A flow control structure is a device that alters the flow of water in a stream, drainage channel or pipe. As a group these are passive structures since they operate without intervention under different amounts of water flow and their impact changes based on the quantity of water available.
Subsurface drainage to ditches offers a way to remove excess water from agricultural fields, or vital urban spaces, without the erosion rates and pollution transport that results from direct surface runoff. However, excess drainage results in recurring drought induced crop yield losses and more severe urban heat island or desiccation issues.
These methods include planting vegetation to retain extra water, terracing hillsides to slow flow downhill, and the construction of floodways (man-made channels to divert floodwater). [39] Other techniques include the construction of levees, lakes, dams, reservoirs, [ 39 ] retention ponds to hold extra water during times of flooding.
Mar. 5—POTTSVILLE — Dana Mansell, a lifelong resident of Pottsville, has seen continuous damage to her property on Hillside Road over the past few years due to increased water runoff. Mansell ...
A diagram of a traditional French drain. A French drain [1] (also known by other names including trench drain, blind drain, [1] rubble drain, [1] and rock drain [1]) is a trench filled with gravel or rock, or both, with or without a perforated pipe that redirects surface water and groundwater away from an area.
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