We visited the Koshi River near Biratnagar where is about one hour flight from Kathmandu.
The Koshi River runs from the Himaraya Mountain through Nepal, India and Bangladesh.
Near the boundary between Nepal and Indea, there is a big barrarge, where
the width of ther river is fixed in very narrow width.
Since the barrarge section is narrow, the back water effect is always strong
along the upstream leach of barrarge,
and then the sedimentation is very active there, which increaces the denger
of the inundation.
In 2008, a large scale levee breach took place and 2.7 millions of people evacuated, which is one of the largest scale flood in this century.
http://news.bbc.co.uk/2/hi/in_pictures/7586256.stm
http://www.amurt.eu/node/21
http://riseupindia.wordpress.com/2008/08/30/bihar-flood-the-disaster-widens/
A large amout of deposit is still there and people living there are suffering from the flood.
We made an iRIC simulation and Dr. Akahori presented it in the Seminar
on Koshi River problem on 15 MAR 2012 at Kathmandu.
