The aqueduct is built on one strata of rock, each pier being constructed of local stone and rising to a height of 116ft (35m). The support piers are tapered, measuring 27ft (8m) in width at the bottom and 17ft (5m) at the top. 19 cast iron arches, each with a 45ft (13.6m) span support the bridgework. Mortar used in the construction comprised of lime, water and Oxen blood. The iron castings were produced at the Plaskynaston Foundy and each casting dovetail's into the next. To seal the ironwork, the joints were caulked with Welsh flannel dipped in boiling sugar, and then sealed with lead. The bridge section was made entirely from cast iron, the overall dimension of ironwork being 11ft (3.3m) wide, 5.25ft (1.6m) deep and 1,007ft (305m) long. Once constructed the trough was filled with water and