Designed by William Emes in 1774, this structure is said to have been installed to prevent erosion of the sides of the Black Brook and was clearly intended as an ornamental feature to be enjoyed from the approach on the N carriage drive. It is a shallow circular stone bowl with a cylindrical stone weir set in the dammed brook. The water drops vertically down and exits through a rusticated tunnel entrance which is attached on each side to splayed stone walls with wide flat stone parapets set into the slope.
Associated with Erddig Park (Nprn 86570)
Source: DE/DOM/SJ34NW, from the Cadw listed buildings database
J. Archer, RCAHMW, 9.11.2004