I am looking for the location and name of the park in Los Angeles /
Hollywood where scenes were shot for many silent movies. These scenes
showed various people being pushed into a pond/tank of water. This
tank or rectangular pond is in a small park. It has been said that
these scene were practically required for any comedy movie being made
in the silent movie era. I would like to find ou the name of this park
and its location so I can visit it the end of the month. It has been
mentioned in documentaries about the silent movie comedies but I am
stumped as to finding reference to it.

Dave,

Try this book at your local library:
http://www.touchstone.freeserve.co.uk/keaton/bengtson.html

It contains information regarding the whereabouts of the locations in
several Buster Keaton films.