Geology and Hydrology
The upper reaches of the Fowey are mainly moorland giving way to woodland and farmland, predominantly livestock. This means that 63.6% of the catchment is grassland, with a further 18.3% woodland and 10.7% arable land. Of the remaining 7.5%, 2.6% is urban or built-up areas, 2.5% is mountain, heath and bog and the remainder is inland waters.
The catchment area of the River Fowey covers a total of 41,800 acres (65.3 sq. miles) consisting of kaolinised granite on Bodmin Moor, Devonian slates and grits, and valley gravels. Data collected by the National Water Archive shows that average flow at the Restormel monitoring station is 4.78 cubic m/s and is affected by the reservoirs at Colliford and Sibleyback and by abstraction of water for public supply.
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