Last week we did Marchlyn Bach - This week we did Marchlyn Mawr - a good, not too taxing walk - takes about 3 hours..
Built to feed the Dinorwic Power Station, the lake itself lies in between two mountains Carnedd y Fillast and Elidir Fawr and lies at a height of 636m above sea level and the reservoir took four years to build (from 1975-1979).
From the reservoir, a 34 ft diameter tunnel runs for a mile to a 33ft diameter vertical shaft. From the bottom of the shaft, a 31ft diameter tunnel leads to the power station, 670 metres away.
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