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Drainage district. Drainage districts occur in England and Wales, varying in size from a few hundred acres to over 100,000 acres (400 km 2 ), all in low-lying areas of the country where flood risk management and land drainage are sensitive issues. Most drainage districts are administered by an internal drainage board (IDB), which are single ...
In 1948 Congress approved the Central and Southern Florida Project for Flood Control and Other Purposes (C&SF) and consolidated the Everglades Drainage District and the Okeechobee Flood Control District under this. The C&SF used four methods in flood management: levees, water storage areas, canal improvements, and large pumps to assist gravity.
Drain commissioner. A drain commissioner is an elected official in county government of the U.S. state of Michigan who is responsible for planning, developing and maintaining surface water drainage systems under Public Act 40 of 1956. [1] In counties with a population under 12,000, the office of drain commissioner may be abolished with its ...
Drainage. High-density polyethylene pipe installation in a storm drain project, Mexico. Drainage is the natural or artificial removal of a surface's water and sub-surface water from an area with excess water. The internal drainage of most agricultural soils can prevent severe waterlogging (anaerobic conditions that harm root growth), but many ...
Drainage in the Fenland consists of both river drainage and internal drainage of the land between the rivers. The internal drainage was organised by levels or districts, each of which includes the fen parts of one or several parishes. The details of the organisation vary with the history of their development, but the areas generally include:
Two-stage drainage ditch. A drainage ditch is a depression in the land created to channel water. Drainage ditches are typically formed around low-lying areas, roadsides or fields proximate to a water body or created to channel water from a more distant water source for the purpose of plant irrigation. The two stage drainage ditch is classified ...
Drainage district employees control water flows with pumps and floodgates. Tidal fluctuations cause reverse flow on the lower slough. The Columbia floodplain, formed by geologic processes including lava flows, volcanic eruptions, and the Missoula Floods , is part of the Portland Basin , which extends across the Columbia River from Multnomah ...
A drainage basin is an area of land where all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, the drainage divide, [1] made up of a succession of elevated features, such as ridges and hills.