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Two River Baisins - the Severn and the Amazon

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02/11/2007 Drainage Basins UK: The River Severn Drainage Basin: The River Severn is the longest river in Britain and flows for 354 km from its source in the Cambrian Mountains in Wales, to its mouth at the seven estuary in the Bristol Channel. The area of the River Severn drainage basin is 11,420 square kilometers and is circular/ oval in shape. There are 16 main tributaries of the River Severn, including; the Vyrnwy, the Tern, the Stour, the Warwickshire Avon, the Bristol Avon Teme, the Leadon, and the Wye. There are also many smaller tributaries that join the River Severn along its course, although the actual number is not known. ...read more.


The River Severn is very prone to flooding as the source is located in Wales where there is regular heavy rain. This large volume of water combined with melt water and increased velocity due to ?V? shaped valleys cause the river to flood often. In 1795 the highest flood to the present day, of the River Severn, was recorded and in 1818 the River Severn flooded 5 times within one year. LEDC: The River Amazon Drainage Basin: The River Amazon is located in South America largely in Brazil but also in Puru Bolivia and Columbia. ...read more.


The climate along the River Amazon is warm and humid, although there is a large difference between the temperature in the day and that of the night. The difference in temperature is greater than the difference between the seasons. The average temperature in the Amazon basin is 79 degrees and there is on average over 80 inches of rainfall per year. The relief of the River Amazon basin is very varied along the course; at the source the relief is very steep but the relief becomes gentler toward the middle and lower course of the river. The river Amazon floods annual between June and October, during the rainy season. Sometimes the width of the river can reach 40km wide. ...read more.

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