Floodgate
They may be designed to set spillway crest heights in dams, to adjust flow rates in sluices and canals, or they may be designed to stop water flow entirely as part of a levee or storm surge system.Since most of these devices operate by controlling the water surface elevation being stored or routed, they are also known as crest gates.In the case of flood bypass systems, floodgates sometimes are also used to lower the water levels in a main river or canal channels by allowing more water to flow into a flood bypass or detention basin when the main river or canal is approaching a flood stage.[clarification needed] Valves used in floodgate applications have a variety of design requirements and are usually located at the base of dams.Unless this energy is dissipated, the flow can erode nearby rock and soil and damage structures.
CoupureFloodgate (disambiguation)typhoonflood barriersreservoirstreamspillwaysluicescanalsstorm surgedetention basinsluice gatestoplogscoupuresHarran canalflood wallhydraulic powerUS Army Corps of EngineersScrivener DamTainter gatestrunnionbearingshydrostatic forcesTainter gatediversion damMississippiArrowrock DamFrançois LempérièreTerminus DamLake Kaweahpressure headerosionneedle valvegate valveUnited States Bureau of ReclamationcavitationMerikoski Power PlantFinlandequationnewtonspascaldensityacceleration due to gravityrectanglelengthheightwater columnFlood barrierTidal barrageCanal lockThames BarrierDelta WorksOosterscheldekeringCoastal managementManagementAccretionCoastal engineeringIntegrated coastal zone managementManaged retreatSubmersionHard engineeringA-JacksAccropodeArtificial reefBreachwayBreakwaterCliff stabilizationGabionGroyneHoneycomb sea wallHudson's equationRevetmentRiprapSeawallTetrapodTraining wallVan der Meer formulaSoft engineeringBeach nourishmentDynamic revetmentLiving shorelinesSand dune stabilizationBeach evolutionCoastal erosionGeotechnical engineeringLand reclamationLongshore transportModern recession of beachesStream restoration