How to use estuary in a sentence. Flood probability estimation is important for applications such as land use planning, reservoir operation, infrastructure design and safety assessments. Did You Know? An estuary is where a river meets the sea.There, saltwater mixes with freshwater.The river becomes wider and wider and flows slowly to the ocean.. Bays, marshes, swamps, and inlets can all have estuaries. Tide-dominated estuaries, however, respond more rapidly in reworking flood-eroded sediment and are typically fully adjusted to modal wave and tidal conditions within a few months to a few years. An estuary may also be called a bay, lagoon, sound, or slough. Flood is defined as overflow of water that sub merges dry land. Estuary-coastal behaviour at river-dominated estuaries may be influenced for several decades by post-flood morphological adjustment. Barrier beaches and islands are formed by the accumulation of sand or sediments deposited by ocean waves. The term estuary is derived from the Latin words aestus (“the tide”) and aestuo (“boil”), indicating the effect generated when tidal flow and river flow meet. A view of an estuary from the air is usually an interesting sight: many estuaries meander (curve and bend) to find their way to the sea. In estuaries, the salty ocean mixes with a freshwater river, resulting in brackish water.Brackish water is somewhat salty, but not as salty as the ocean. Estuary definition, that part of the mouth or lower course of a river in which the river's current meets the sea's tide. Definitions of FEMA Flood Zone Designations Flood zones are geographic areas that the FEMA has defined according to varying levels of flood risk. An estuary is an area where a freshwater river or stream meets the ocean. See more. Salt marsh grasses and other estuarine plants also help prevent erosion and stabilize shorelines. Water continually circulates into and out of an estuary. Drowned river valley estuaries are formed when rising sea levels flood existing river valleys. Estuaries Act as Protective Buffers Wetland plants and soils also act as natural buffers between the land and ocean, absorbing flood waters and dissipating storm surges. Estuary definition is - a water passage where the tide meets a river current; especially : an arm of the sea at the lower end of a river. Bar-built estuaries are characterized by barrier beaches or islands that form parallel to the coastline and separate the estuary from the ocean. There are five types of flood namely Areal, Riverine, Estuarine and coastal, Urban flooding and catastrophic. These zones are depicted on a community's Flood Insurance Rate Map (FIRM) or Flood Hazard Boundary Map. Estuary, partly enclosed coastal body of water in which river water is mixed with seawater.In a general sense, the estuarine environment is defined by salinity boundaries rather than by geographic boundaries. 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