39009 - Thames at Bray Weir

Grid Reference:	41 (SU) 909 797
Operator:	EA
Local number:	2600
Catchment Area:	6915.3 km²
Level of Station:	21.3 mOD
Max. Altitude:	330.0 mOD
Mean flow:	58.21 m³s^-1
95% exceedance (Q95):	15.26 m ³s^-1
10% exceedance (Q10):	127.0 m³s^-1
61-90 Av. Ann. Rainfall:	697 mm

Sample Hydrograph of Gauged Daily Flows

Flow Duration Curve for Gauged Daily Flows

Station Description

Complex barrage of gates and sluices with a substantial leakage rate. Not a primary gauging station; flows are indicative only. Closed 1982.

Catchment Description

Large catchment; scarp and vale topography developed on diverse geology. Predominately rural headwaters contrast with considerable suburban growth in the lower valley.

Factors Affecting Runoff

Reservoir(s) in catchment affect runoff.
Runoff influenced by groundwater abstraction/recharge.
Runoff increased by effluent returns.
Runoff reduced by industrial/agricultural abstraction.

River Flow and Catchment Rainfall on the National River Flow Archive

Gauged Daily Flows (gdf):	1959 to 1982
Monthly Catchment Rainfall (rnf):	1959 to 2008

Datatype	1950s										1960s										1970s										1980s										1990s										2000s

gdf
rnf

For many stations monthly peak flows are also archived. When daily flow data are not available monthly mean flows may be held on the National River Flow Archive. See Data Holdings for further information.

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