1) Fill in the pond. That will deny them a water source for them and their food, and softening the skin for shedding.
2) Eliminate the plants, trees, rocks or any other structure they can hide in, get shade, or where their food source hides. You'd be 99.99% safe building your house on a 1 acre parking lot.
3) If items #1 or #2 don't work, pray for snow...
I hope advice this helps you get rid of those pesky rodent eaters. If it wasn't for snakes though, we'd only have spiders to make grown men scream like girls.
