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Hesselberg Hydro

Winscar Dam, Yorkshire

Completed in 1975 with a rockfill embankment dam (53m high and 520m long), Winscar is one of several reservoirs in the UK with an asphaltic concrete, watertight element on the upstream face. The membrane is of the older, two-layered type. Very low water levels throughout the winter and summer of 1995/6 provided Hesselberg Hydro with the opportunity to inspect the lining for our client, Yorkshire Water Services.

We recommended further inspections and repair whenever low reservoir levels allow..

We also calculated that, irrespective of damage to the upper DAC, the intact lower layer should withstand predicted wave attack over the next 30 years. Thereafter, fatigue and damage to the asphalt is a possibility.