Hi Michael,
I suspected that.
I’m not interested in fine sediment transported out of the river, rather the changes in bed elevation. It is a coarse gravel bed so there is limited sediment exchange out of bank anyway.
You can have storage areas for steady flows though. I just need a mechanism to remove out of bank flow from the channel to ensure the velocities are correct during flood events. Due to the geomtrey of the river and floodplains I cannot simply extend the sections.
Any suggestions how best to do this?
Cheers