Yeah this is about right. It looks just about like this. slightly different configuration but the Idea is the same and they are there for the same purposes of relieving water that might have slipped through.
You are right my REAL fear is that I don't have enough coming in to over come the pond's losses. I am just not quit sure of how to attack this proble if in deed it is a problem. I was hoping to dig a new core accross the back but these toe drains would have to be removed first then reinstalled.

Or I can just drain the wohle thing and fill in the deep areas and make the lake on 20 feet instead of 30 feet.
Just not sure of what to do right now.