Jeff,
We just had our pond analyzed by HTS Consulting out of Houston.
http://www.htshouston.com/ Ours was a big project. We have a 35 acre pond that was repaired once before, but only the bottom 1/3. When we suffered the same as you ( filled to half way and then leveled off) we got HTS out. They drilled around 20 monitoring wells around the perimeter to the depth of the pond. Pesiometers were installed, and a 4 month monitoring commenced. This located three main areas of leak that accounted for an estimated 400-500 gpm leak rate (we had over 40" of rain in the time frame of the study). The result has been repair of approximately 11 acres of the remaining pond bottom. Due to cost considerations, the repairs were done using ESS-13. That is a whole other story.
We are filling now (just completed the repairs last week) and we have gained 20" in just 10 days on an estimated 10 acre coverage.
