39008 - Thames at Eynsham

Grid Reference:	42 (SP) 445 087
Operator:	EA
Local number:	1200
Catchment Area:	1616.2 km²
Level of Station:	59.7 mOD
Max. Altitude:	330.0 mOD
Mean flow:	14.03 m³s^-1
95% exceedance (Q95):	1.15 m³s^-1
10% exceedance (Q10):	33.0 m³s^-1
61-90 Av. Ann. Rainfall:	730 mm

Sample Hydrograph of Gauged Daily Flows

Flow Duration Curve for Gauged Daily Flows

Station Description

Complex barrage of gates and weirs, total breadth 30m. Some bypassing at extreme discharges when structure can be submerged. July 2007 peak estimated at 135 cumecs. Early flow data derived from once-daily gaugeboard readings. Naturalised flows available for period of record; off-take for Farmoor reservoir is immediately u/s (operating from 1955).

Catchment Description

Geology: mixed - pervious headwaters (Oolitic L'st), Oxford Clay in lower reaches. Mainly rural with development concentrated along the valley bottom (and around Swindon).

Factors Affecting Runoff

Reservoir(s) in catchment affect runoff.
Runoff reduced by public water supply abstraction.
Runoff increased by effluent returns.

River Flow and Catchment Rainfall on the National River Flow Archive

Gauged Daily Flows (gdf):	1951 to 2008
Naturalised Daily Flows (ndf):	1951 to 2002
Naturalised Monthly Flows (nmf):	1951 to 2002
Monthly Catchment Rainfall (rnf):	1951 to 2008

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

gdf
ndf
nmf
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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