The issue with the "soft Mud" is that there is the occasional brick, cinder block, chair, dock box, log, etc.
Where do you think all the crap from Sandy went?
Last time I went down a canal, I had plenty of water going in, but coming out, it got shallow and I just touched and caught what felt like a log and it was jsut enough to bend a blade. $1200 canal ride!
With IPS, I don't explore anything I don't know!