Groby (pronounced Grooby) Pool lies in a hollow in the Mercia Mudstone, underlain by Swithland Slate, with its eastern boundary separated from the Sheet hedges Syenite by the Copt Oak fault. The presence of 'granite' has led to the assumption that it has formed a 'natural' dam, which might account for the origin of the Lake. Whilst it is true that embankments have been constructed on the 'granite' base along with Sluice gates to make a more viable millpond, it is doubtful whether the granite alone would retain a lake.
There is a record of the old embankments being raised in 1889, when it was part of the Countess of Stamford's estate, to prevent recurrent flooding of the adjacent quarries. This had the effect of artificially raising the water to is present level.
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