39005 - Beverley Brook at Wimbledon Common

Grid Reference:	51 (TQ) 216 717
Operator:	EA
Local number:	4080
Catchment Area:	43.5 km²
Level of Station:	11.0 mOD
Max. Altitude:	190.0 mOD
Mean flow:	0.54 m³s^-1
95% exceedance (Q95):	0.221 m ³s^-1
10% exceedance (Q10):	0.903 m³s^-1
61-90 Av. Ann. Rainfall:	630 mm

Sample Hydrograph of Gauged Daily Flows

Flow Duration Curve for Gauged Daily Flows

Station Description

Trapezoidal critical-depth flume (overall channel width: 10m). Ongoing gauging programme to verify rating (which overestimates flows). Station originates in 1935; flume built in 1940 but no standing-wave until invert raised in 1961. Capacities of U/s and D/s culverts can influence flood flows. Bypassed during flood of Sept. 1968; peak estimated at 24-34 cumecs. Highest gauging c0.7 Qmed. Very patchy flow record prior to 1983. Artificial influences have sig. impact on the flow regime - runoff augmented by sewage effluent which has increased over time; groundwater abstractions also. Topographic catchment slightly exceeds effective drainage area.

Catchment Description

A narrow catchment; largely London Clay below Chalk headwaters. Suburban/urban land use dominates throughout the catchment.

Factors Affecting Runoff

Runoff influenced by groundwater abstraction/recharge.
Runoff increased by effluent returns.

River Flow and Catchment Rainfall on the National River Flow Archive

Gauged Daily Flows (gdf):	1935 to 2008
Monthly Catchment Rainfall (rnf):	1935 to 2008

Datatype	1930s										1940s										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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