Catchment Area
The drainage area of the River Mole is 512 km² and forms 5% of the River Thames catchment area above Teddington. Annually the catchment area receives 761 mm rain each year, the greatest average level of rainfall is 800 mm rain around Crawley. The Mole catchment reaches a maximum elevation of 265 m (869 ft) above Ordnance Datum at Leith Hill to the south west of Dorking. There is only one aquifer in the drainage basin, at Fetcham, which means that the majority of the water in the river is from surface drainage, particularly from Gatwick Airport and the urban areas of Horley and Crawley, and that the flow rate responds rapidly to rainfall.
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