i didnt realize how much of a difference a small watershed could do until i built my pond. i have a 12" pipe in my pond, when we get a quick 1" rain my pond will jump 4" over full pool with the 12" pipe doing all it can do..my pond stays full luckily due to a small stream, but it was hard for me to imagine 1" of rain causing the pond to jump 4"....12" pipe of water leaving at the same time is a huge amount too...
