I have a 1/4 acre pond (10 foot deep) that was built into a ravine. The dam at the water line is about 100 feet long. The adjacent two shorelines are 170' each (triangle shape). But, the top of my dam is much longer due to the 2 - 3 foot of freeboard. Freebaord is the height of the dam above fullpool level (where the outlet pipe is located on the pond side). This is very important to my pond as it holds alot of water once the overflow pipe is flooded and keeps it from flooding my front yard. It acts like a holding basin and yields good flash flood protection. I have excess watershed that tends to flush the pond a few times a year.
I can't really advise you with respect to pond construction design, but there are two books that get recommended here very regularly to those building a pond...
"Just Add Water"
"Perfect Pond...Want One?"
Found Here...
https://www.pondboss.com/store?c=8Welcome back and it's good to hear that your startig the process!
