Originally Posted by
ootai
What i believe they are doing is making a rectangle of retaining walls to hold the fill they are pushing into the middle.
If you have a look at the thread "Anyway to repair a perimeter wall" in post 317 i have inserted a diagram of how I reckon a retaing wall should be built and it looks just like what they have done.
So IMHO they have built it to contsain the fill and nothing to do with flood protection, and I might add done a bloody good job. Those walls will never bugle out.