
MIDDLE COURSE
Slowing the flow of water substantially, through these sections of the river, will reduce flood further downstream.
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Centuries of natural erosion, man made deviations and earthquake cause changes to the river, removing many
meanders, shortening the river and speeding up the flow. The result of the shortening of the river is the increased
occurrence of floods downstream.
Reenstating Meanders
Reenstating Meanders
Look for places where the river has been straightened from its historical curves. These areas contribute towards flooding downstream as water passes through much quicker than in the past - essentially shortening the journey water takes to get to the lower course. Using google maps or other satellite images you can find areas where the river has been shortened.
In this image you can see two major historical meanders which have been by passed as the river has been straightened.

Look for locations where you can excavate the old river meanders to increase the length and therefore capacity of the river.
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Things to Consider
New river banks should be excavated at no grater than 1:1 to 1:1.5 to ensure stability.
Also riverbanks should be planted with appropriate local vegetation.
Has human development taken place over or very close to the old meanders? What steps need to be taken to either prtect of relocate these developments?
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Further Reading
https://www.fao.org/4/t0401e/t0401e02.htm
https://www.therrc.co.uk/assets/pdfs/mot/Decision_support/ds1_v2.pdf
https://www.bbc.com/future/article/20240918-how-restoring-rivers-natural-curves-can-prevent-flooding
https://www.nwrm.eu/sites/default/files/nwrm_ressources/n4_-_re-meandering.pdf