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Howden Reservoir in the Derbyshire Peak District.
Howden reservoir is the first in a chain of 3 reservoirs proving water
for the area. When rainwater and land drainage water fills this reservoir,
it then overflows into the famous Derwent Reservoir where the Dambuster
pilots practiced. When Derwent reservoir when full, it then overflows
into Ladybower Reservoir.
These reservoirs are the main source of water for Severn Trent Water.