Welcome to Pond Boss, rockymack.

I don't have a lot of experience with your question, but my guess is that there is a "deeper" issue, no pun intended. I was never aware that crawdad holes actually connected to other areas thereby causing serious pond leaks.

This is just a guess, but I wonder if the crawdad holes just happen to be in an area that is prone to a leak for other reasons.

Are you able to see where the water is coming out, or going to? Is there a dam, or is this an excavated pond?

Let's see what others have to say.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."