I plan on fishing a small river ford this year. This river is prone to extended flooding. The old ford is bedrock. Any coins or artifacts will be downstream. The rocks get flushed downstream and get stacked up making gravel bars. Heres my question. I have never hunted an area like this before. Can coins be pushed downstream and end up close to the surface of the gravel bars, or are they too heavy and be on the bottom , out of reach?