There are five types of flood namely Areal, Riverine, Estuarine and coastal, Urban flooding and catastrophic. An estuary may also be called a bay, lagoon, sound, or slough. 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. Definitions of FEMA Flood Zone Designations Flood zones are geographic areas that the FEMA has defined according to varying levels of flood risk. Barrier beaches and islands are formed by the accumulation of sand or sediments deposited by ocean waves. Flood is defined as overflow of water that sub merges dry land. 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. How to use estuary in a sentence. See more. 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. Salt marsh grasses and other estuarine plants also help prevent erosion and stabilize shorelines. However, it is a challenging task, especially in estuarine areas where floods are caused by both intense rainfall and storm surge. Drowned river valley estuaries are formed when rising sea levels flood existing river valleys. 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. 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. Bar-built estuaries are characterized by barrier beaches or islands that form parallel to the coastline and separate the estuary from the ocean. Water continually circulates into and out of 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. 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-coastal behaviour at river-dominated estuaries may be influenced for several decades by post-flood morphological adjustment. Did You Know? Flood probability estimation is important for applications such as land use planning, reservoir operation, infrastructure design and safety assessments. 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. 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