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The Basin formed on top of the Late Cretaceous Chalk Group, which is exposed on the dip slopes of the Chilterns and North Downs. Within the centre of the basin the Chalk is mainly covered by Palaeocene, Eocene and younger rocks, though the chalk is also brought to the surface by localised folds and faults, for example at Windsor Castle, Lewisham and Purfleet.
Drainage basin of the Ohio River, part of the Mississippi River drainage basin. In hydrology, the drainage basin is a logical unit of focus [clarification needed] for studying the movement of water within the hydrological cycle. The process of finding a drainage boundary is referred to as watershed delineation. Finding the area and extent of a ...
Drainage basin management – covers water-storage, in the form of reservoirs, and flood-protection. Water quality – includes the chemistry of water in rivers and lakes, both of pollutants and natural solutes.
From October 1993 to January 1994, there was a significant increase in rainfall in the River Lavant drainage basin, compared to the average. From 1961 to 1990, during the October to January period, rainfall in the basin averaged 379mm. In the same period from 1993 to 1994 the basin received 610mm of rainfall, an increase of 231mm or 61%. [3]
Dendritic drainage: the Yarlung Tsangpo River, Tibet, seen from space: snow cover has melted in the valley system. In geomorphology, drainage systems, also known as river systems, are the patterns formed by the streams, rivers, and lakes in a particular drainage basin. They are governed by the topography of land, whether a particular region is ...
Note that, in the UK, the terms "river basin" and "catchment" are used officially and far more frequently than the US term "drainage basin". See the lists of rivers of England, Scotland, Wales and Northern Ireland.
In the Weald Basin, the Lower Greensand can usually be subdivided to formational levels with varying properties into, in ascending order, the Atherfield Clay Formation, the Hythe Formation, the Sandgate Formation, and the Folkestone Formation.
The drainage basin of the Severn. The Avon is the easternmost river shown. "Avon" derives from the British language abona, "river", which also survives as a number of other English and Scottish river names, and as modern Welsh afon and Cornish avon, "river". This makes "River Avon" an example of a tautological place name.