RE: xela1's question! gobblyEverything I read says that sediments carried by a river will settle out near to the river not far away. Here's a quote:
'when a river floods (figure 12.25) it immediately begins to deposit sediment, coarse material dropped almost immediately making the river bank high; the river bank is actually higher than the surrounding floodplain'
The website where Igot this has lots of good information on rivers and sediments https://www.riverresource.com/text/RIVER_SYSTEMS.html
Owl