I remember sitting on the top of the posts holding up the surrounding fence and, I believe, when it was drained all manner of disgusting things were found in it.
I remember being soundly 'told off' by the Headmaster of St.Luke's school -
The area is now a little 'park' with a path leading through to Birchfield Road by the shop called the Chocolate Box which was then run by Mr and Mrs Brazil as a sweet shop.