On a one acre pond, only one dog won't chase them away if they don't want to leave. My Springers would swim after the geese, chasing the geese 'round and 'round my pond and whenever they got a bit too close the geese would take flight for 20' just to stay ahead of them.
A dog chasing them in the water and a person in a boat or a canoe, that's a different story. They won't stay on the water for long.
Are they roosting there? "Away with Geese". It works if there isn't a vandalism problem.
http://www.awaywithgeese.com/awg2_web.nsf?Open Another thing to do if they are walking out of the pond and grazing on the grass is to spray the grass with a repellent. Look at
http://www.flightcontrol.com/ WIth it being a park, momofilament line strung on stakes around the pond perimeter probably won't work very well.
