But seriously, I believe we are awaiting reply from Airwreck to Sunil's real questions:
Welcome to Pond Boss, Airwreck.
Will your pond be in Barbados?
If you are saying that there is no place for you to create a spillway for your pond that would avoid violating any adjacent land owners rights, I'm not sure how that will play out.
If I am reading your question correctly, I would think you have to try and strike a deal with one of your neighbors, maybe even a shared usage of the pond.
If this is for a pond in Barbados, I'm in over my head.
Anyway, welcome again and let's see what others say.