Gotcha
. I know in many areas, if its not upkept it falls back to naturalization. Best to keep working on it to avoid it being "reclaimed".
I think you have the right idea, the main outflow is used most of the time. The second one(emergency spillway) is for those rare 100 year floods. I don't know who you would contact to find out the proper watershed to overflow pipe size, without raising to much hackles.
What caused troubles for the pond to be in the shape it is in now?
Possibly Ewest will be able to help. I think he is somewhat close. Might try PM him if he don't chime in here.
