Problems construction in alluvial plains

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Offline kaatv

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Problems construction in alluvial plains
« on: 31/03/2016 18:53:41 »
What are the problems related to construction on alluvial plains, except for soil subsidence?

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Offline evan_au

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Re: Problems construction in alluvial plains
« Reply #1 on: 31/03/2016 21:07:18 »
Alluvial plains are formed by flowing rivers. If the river starts flowing again, your building could get flooded, or the foundations washed away.

Christchurch in New Zealand was built on an alluvial plain that hid the signs of a large earthquake fault line. The earthquake liquified some of the ground, causing many buildings to collapse. It is very hard to produce firm foundations on loose-packed rock and soil.
See: http://en.wikipedia.org/wiki/2011_Christchurch_earthquake#Damage_and_effects