Flood bypass

Flood bypass

A flood bypass is a region of land or a large man-made structure that is designed to convey excess flood waters from a river or stream in order to reduce the risk of flooding on the natural river or stream near a key point of interest, such as a city. Flood bypasses, sometimes called "floodways", often have man-made diversion works, such as diversion weirs and spillways, at their head or point of origin. The main body of a flood bypass is often a natural flood plain. Many flood bypasses are designed to carry enough water such that combined flows down the original river or stream and flood bypass will not exceed the expected maximum flood flow of the river or stream.

Flood bypasses are typically used only during major floods and act in a similar nature to a detention basin. Since the area of a flood bypass is significantly larger than the cross-sectional area of the original river or stream channel from which water is diverted, the velocity of water in a flood bypass will be significantly lower than the velocity of the flood water in the original system. These low velocities often cause increased sediment deposition in the flood bypass, thus it is important to incorporate a mantaince program for the entire flood bypass system when it is not being actively used during a flood operation.

When not being used to convey water, flood bypasses are sometimes used for agricultural or environmental purposes. The land is often owned by a public authority and then rented to farmers or ranchers, who in turn plant crops or herd livestock that feed off the flood plain. Since the flood bypass is subjected to sedimentation during flood events, the land is often very productive and even a loss of crops due to flooding can sometimes be recovered due to the high yield of the land during the non-flood periods.

Examples of Flood Bypasses

* Bonnet Carré Spillway
* Eastside Bypass
* Yolo Bypass


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Tampa Bypass Canal — The Tampa Bypass Canal is a 14 mile long flood bypass operated by the Southwest Florida Water Management District. This canal includes several concrete flood control structures. It was constructed during the 1970s. Its purpose is to redirect… …   Wikipedia

  • Yolo Bypass Wildlife Area — and Yolo Basin Foundation are the core partners in the operation of this unique community resource. HistoryThe Wildlife Area was open to the public in 1997 after extensive restoration efforts completed by Ducks Unlimited with federal funds… …   Wikipedia

  • Napa River Flood Project — A portion of the Napa River floodwall constructed by the Corps of Engineers. Photo taken from the 3rd Street bridge. The Napa River Napa Creek Flood Protection Project is a Civil Works project of the US Army Corps of Engineers in the city of Napa …   Wikipedia

  • Floodgate — Tokyo floodgates created to protect from typhoon surges Floodgates are adjustable gates used to control water flow in flood barriers, reservoir, river, stream, or levee systems. They may be designed to set spillway crest heights in dams, to… …   Wikipedia

  • Space for the River — Room for the River OverviewThe Rhine River Delta experiences annual flooding. High water levels are a wakeup call and flooding remains a threat. In 1993 and 1995, the flooding experienced left an array of devastation to the immediate and… …   Wikipedia

  • Hennepin Island Hydroelectric Plant — Infobox nrhp name = Hennepin Island Hydroelectric Plant nrhp type =cp caption = location = W. side of Hennepin Island, Minneapolis, Minnesota, USA lat degrees = lat minutes = lat seconds = lat direction = long degrees = long minutes = long… …   Wikipedia

  • List of Statutory Instruments of the United Kingdom, 1990 — NOTOC This is a complete list of all 1646 Statutory Instruments published in the United Kingdom in the year 1990.1 100* Caseins and Caseinates (Scotland) Amendment Regulations 1990 S.I. 1990/1 * Personal Community Charge (Relief) (England)… …   Wikipedia

  • List of Statutory Instruments of the United Kingdom, 1996 — This is a complete list of all 2071 Statutory Instruments published in the United Kingdom in the year 1996. NOTOC 1 100* Insurance Companies (Pension Business)(Transitional Provisions) (Amendment) Regulations 1996 S.I. 1996/1 * Sea Fishing… …   Wikipedia

  • San Joaquin River — Coordinates: 38°04′00″N 121°51′04″W / 38.0666667°N 121.85111°W / 38.0666667; 121.85111 …   Wikipedia

  • List of Statutory Instruments of the United Kingdom, 1996 (1001-2000) — This is a List of Statutory Instruments of the United Kingdom, 1996 from 1001 to 2000.1001 1100* Norfolk and Norwich Health Care National Health Service Trust (Establishment) Amendment Order 1996 [http://www.opsi.gov.uk/si/si1996/Uksi 19961001 en …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”