The tap was wrenched off the water feature, which was also defaced, and one of the heavy wooden benches was pushed over.
In April a 5ft wooden carving in the sensory garden was sawn off near its base.
Jim Whittaker, secretary of the Friends of Kingswood Park, said the latest attack happened on Sunday 11th September and came at a particularly difficult time as all their resources were focused on re-instating the rose arch and renovating the children’s play area.
He said: “The water feature was badly damaged, leaving water flooding over the area. The council have turned off the water but of course the water feature is now unusable.
“This water feature is very popular, not only as a source of drinking water, but as an element of play where children experiment with filling pots of various sizes and other watery games.
“In the same incident, one of the very heavy wooden benches in the garden was overturned.”
“People have worked hard to make this a lovely spot and it is very disappointing that others thoughtless actions ruin it for many.
“Avon & Somerset Constabulary have been informed and we will be grateful for any information relating to this incident.”