The settling pond was excavated in 1962 and used in the operation of the fish farm downstream.
Before the pond was built the water race would frequently block with gravel and sand. Fish farm workers had to clean the race daily.
With the settling pond as a part of the system, the water was then diverted into the pond from the race, and the gravel or sand would drop down and ‘settle.’ A screen was also installed to catch rubbish. The water would then flow down the race and was reasonably clear.
Today the settling pond is no longer used for this purpose but the evidence of its operation can be still seen on the River-Forest walk.