#3 Walka Water Works

The Wall

The reservoir edges follow the natural land contours on the northern and western sides and are bounded by an earthen embankment made from material excavated during the construction of the tanks, filter beds and pumping station on the southern and eastern ends. Its internal face is lined with Ravensfield sandstone blocks. A brick byewash(4m x 2m) is located at the southern west extremity of the reservoir. It has an arched, buttressed brick face covered with concrete render. The byewash contains a large valve which could be opened to lower or drain the water in the reservoir

https://en.wikipedia.org/wiki/Walka_Water_Works