Mole Management Catchment
There are 2 operational catchments in this management catchment.
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Much of the rivers course flows over the Wealden and London clays. However, between Dorking and Leatherhead, in the area known as the Mole Gap, the river cuts its way through the North Downs chalk. In this area some of the river water disappears through holes in the chalk in to the groundwater aquifers before flowing back in to the river near to Leatherhead. This phenomenon has been suggested as giving the river its name. However it is more likely that name originates from the Latin for mill (Mola) or from the town Molesey where the river meets the Thames.