Lower Mole thumb|upright|Painshill Park Waterwheel (on its millstream channel) At Leatherhead, the Mole leaves the chalk and turns northwestwards to flow across impermeable London Clay, winding towards Cobham. The water table rises at this point and much of the water which drained out of the channel through the chalk returns through springs in the riverbed. The aquifer at Fetcham is the only one in the entire catchment area. The next major tributary, The Rye, (which drains Ashtead) joins to the north of Leatherhead, before the river is crossed by the M25 motorway. At Cobham the river swings round in a pronounced axehead meander skirting Painshill Landscape Garden, where a diameter waterwheel raises water from the river to feed the ornamental lake in the park.The undershot wheel at Painshill Park was restored in 1987 and is located at the end of an artificial leat, rather than on the main river channel.
Lower Mole thumb|upright|Painshill Park Waterwheel (on its millstream channel) At Leatherhead, the Mole leaves the chalk and turns northwestwards to flow across impermeable London Clay, winding towards Cobham. The water table rises at this point and much of the water which drained out of the channel through the chalk returns through springs in the riverbed. The aquifer at Fetcham is the only one in the entire catchment area The next major tributary, The Rye, (which drains Ashtead) joins to the north of Leatherhead, before the river is crossed by the M25 motorway. At Cobham the river swings round in a pronounced axehead meander skirting Painshill Landscape Garden, where a diameter waterwheel raises water from the river to feed the ornamental lake in the park.The undershot wheel at Painshill Park was restored in 1987 and is located at the end of an artificial leat, rather than on the main river channel.