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. Flood probability estimation is important for applications such as land use planning, reservoir operation, infrastructure design and safety assessments. 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 is an area where a freshwater river or stream meets the ocean. Salt marsh grasses and other estuarine plants also help prevent erosion and stabilize shorelines. The word "estuary" is derived from the Latin word aestuarium meaning tidal inlet of the sea, which in itself is derived from the term aestus, meaning tide.There have been many definitions proposed to describe an estuary. 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. An estuary may also be called a bay, lagoon, sound, or slough. See more. There are five types of flood namely Areal, Riverine, Estuarine and coastal, Urban flooding and catastrophic. Definitions of FEMA Flood Zone Designations Flood zones are geographic areas that the FEMA has defined according to varying levels of flood risk. How to use estuary in a sentence. Barrier beaches and islands are formed by the accumulation of sand or sediments deposited by ocean waves. Drowned river valley estuaries are formed when rising sea levels flood existing river valleys. Bar-built estuaries are characterized by barrier beaches or islands that form parallel to the coastline and separate the estuary from the ocean. 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. Water continually circulates into and out of an estuary. 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. Flood is defined as overflow of water that sub merges dry land. Estuary definition, that part of the mouth or lower course of a river in which the river's current meets the sea's tide. Did You Know? However, it is a challenging task, especially in estuarine areas where floods are caused by both intense rainfall and storm surge. 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