Pond Boss Forums POND CONSTRUCTION Building a dam Self-built 3 acre pond

In west central MO the NRCS told me 15-20 acres of watershed per acre of pond. So you probably have more than plenty at 80 and perhaps better error to a larger primary pipe diameter.

With a properly designed dam you should be able to use a grassed emergency spillway. Concrete sounds spendy.

In my MO county the NRCS ran all the calculations and designed it for no charge.