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Hesselberg Hydro

Megget Reservoir, Scotland

Remedial works to upstream face rip-rap protection

Megget Reservoir

Megget Reservoir, in the Borders region, and Scotland’s highest embankment dam, supplies some 64,000 Ml to Edinburgh and the surrounding Lothians area.

The 56m high by 570m long dam is a gravel filled embankment with a central asphaltic core. Since first filling in 1983, damage to the rip-rap protection on the upstream face occurred due to higher than predicted wind speeds and consequent wave attack.

East of Scotland Water contracted remedial pattern grouting of rip-rap from Hesselberg Hydro.

Megget Reservoir

Since completion, the upgraded rip-rap has performed very well over two winter periods which have included two severe wind events.

This was a pioneering project – the first successful demonstration of the technology both in the UK and for embankment dams.

“East of Scotland Water has benefited from Hesselberg Hydro’s [and MJ Gleeson’s] involvement in this project. Their practical experience in successfully pattern grouting sea defence works throughout Europe has added to our confidence in accepting this as a robust long term solution to the Megget problem.” Allan Shaw Engineering Design Manager of East of Scotland Water