Thanks, Theo.
Have you ever drawn down your water level for maintenance, etc.? If so, how does the slope of the sides of your underwater island compare to its original state 14 years ago?
A 1:1 slope (45 degree) in clay should be too steep to be stable as a bank feature subject to wave action. What is the depth of the "top" of your island?
Your feature is exactly the type of thing I am asking about. Are clay structures below 6', or X depth stable?
