I was wondering if there was any kind of organization in San Diego that handles rescuing ducks. I started my own thread about it, but got no responses.
There are a lot of domestic ducks set free where I live, including mostly flightless breeds like Indian runners. Everyone loves them and if one disappeared, I and some other people would be very upset and would think a coyote or bobcat got them. But, if someone got permission to rescue them, I wouldn't mind so much as long as someone lets me and other people know, so I agree with asking whomever manages the pond about taking them.
Good luck!