Bybrook River

Bybrook By Brook
The Bybrook at Box, Wiltshire
Location
Country	England
Region	West Country
District	South Gloucestershire
Physical characteristics
Source	Lower Lapdown Farm
• location	Tormarton, South Gloucestershire, England
• coordinates	51°29′54″N 2°20′34″W / 51.4983°N 2.3429°W / 51.4983; -2.3429
• elevation	574 ft (175 m)
2nd source	Folly Farm, South Gloucestershire
• location	Cold Ashton, South Gloucestershire, England
• coordinates	51°27′23″N 2°21′44″W / 51.4565°N 2.3621°W / 51.4565; -2.3621
• elevation	623 ft (190 m)
Source confluence	Nettleton Mill House
• location	Castle Combe, Wiltshire, England
• coordinates	51°29′55″N 2°14′13″W / 51.4985°N 2.2369°W / 51.4985; -2.2369
• elevation	262.5 ft (80.0 m)
Mouth	Bristol Avon
• location	Batheaston, Bath and North East Somerset, England
• coordinates	51°24′06″N 2°18′37″W / 51.4016°N 2.3102°W / 51.4016; -2.3102
• elevation	66 ft (20 m)
Length	12 mi (19 km), south
Discharge
• average	57.25 cu ft/s (1.621 m3/s)
• minimum	4.95 cu ft/s (0.140 m3/s)
• maximum	487.6 cu ft/s (13.81 m3/s)
Basin features
River system	Bristol Avon

The Bybrook, also known as the By Brook, is a small river in England. It is a tributary of the Bristol Avon and is some 12 miles (19 km) long. Its sources are the Burton Brook and the Broadmead Brook, which rise in South Gloucestershire at Tormarton and Cold Ashton respectively, and join just north of Castle Combe in Wiltshire. The river has a mean flow rate of 57.25 cubic feet per second (1.621 m³/s) as recorded at Middlehill near Box. A variety of flora and fauna is supported by the river including the endangered white-clawed crayfish. Twenty watermill sites have been identified on the river but none now remain in use.