Here are a few more pictures. The round pond is 16 feet across. It's 2 feet deep in the middle, shaped like a bowl. The top pond (not pictured is about the same size) The "moat" looking pond is roughly 40 feet long, 6 feet wide and 12 inches deep. (it's not full in the picture). The third picture is one of the areas on top that holds water. (pics of the basins didn't come out). My rudementary estimation for the top of the mountain is, it holds the equivalent of about 8, full size bathtubs. The main pond is 30x16 and closer to 4 feet deep. The last pciture is the main pond at the bottom. The area with the bucket was an area the former owner wanted to put a pile of rocks where the water cascaded down the rocks into the main pond. We decided to just make it a pond. After reading the suggestions on bogs, I wondered if that area could be used for that. It's about 20' long by 10' wide on average. The retention wall is 12" high. That area could be filled with pea stone and plants. After looking at the ponds and trying to figure water volume with calculators, we figure the system holds closer to 10,000 gallons on the high end. We should be topping off the system this afternoon and testing it tomorrow, provided all the water levels are good in the morning. Again. thanks for the help and suggestions.