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A micro by one of Dartmoor's smallest reservoirs.
Wheal Jewell reservoir was built originally to produce hydropower to the surrounding tin mines. Today, the reservoir, which is fed by a leat, is used by the Mary Tavy hydroelectric power station.
For those that are interested, the reservoir holds 6½ million gallons (29,500 cubic metres) of water and provides an operating head of water of 500 feet (152 metres) for the power station. This system comprises three Pelton wheel driven generators, each of 650 kW capacity. The power station at Mary Tavy also has three Francis turbine generators, each of 230kW capacity and together with the hydroelectric power from Bennett’s reservoir, the total power output from Mary Tavy is sufficient to provide the electricity needs of 5000 houses.
If you haven't fallen asleep by now, suggested parking is at N50°36.429 W004°05.237, which provides a pleasant and easy going walk of about two thirds of a mile.
(No hints available.)