I have one of each, the grass one backs up a pair of 6" overflow pipes and the rock/concrete one has a lookout, well at least during the sunny days.

Had I, it to do over, I would go with grass, the concrete masks problems in my experience.



1/4 & 3/4 acre ponds. A thousand miles from no where and there is no place I want to be...
Dwight Yoakam