The alluvial silt that covers the land during flooding increases its fertility. This is in addition to the ready supply of fresh water required for any large societal group.
because then they have their source of water :)
rivers leave fertile soil along their banks after floods
The flood plain of a river is an area very near the river which floods regularly, generally every 1 to 2 years. The 100-year flood plain is a larger area which has a 1 in 100 chance of flooding in any given year. Over the long term this would average out to a flood every century.
no flood control would be stoping a flood a flood plainis land that is covered by water during a flood,formed from sediments depsited by a river
Rivers leave fertile soil along their banks after floods
The river would flood cities near the Mississippi River.
7 feet
Would african civilization began near the nile river valley be a cause or an affect?
The river would flood downstream.
The flood plain. Delta
Because during the spring months the nile would rise and flood the river bank where the farmers grew crops and lots of food would grow and hence people would be happy , but sometimes it did not rise and people did not have food for long.
the river could flood the region, or it could drain, and the region would lose there water supply from that river. if the river gets polluted then it would be a bad water source