39040 - Thames at West Mill Cricklade

Grid Reference:	41 (SU) 094 942
Operator:	EA
Local number:	190
Catchment Area:	185.0 km²
Level of Station:	78.5 mOD
Max. Altitude:	200.0 mOD
Mean flow:	1.44 m³s^-1
95% exceedance (Q95):	0.068 m ³s^-1
10% exceedance (Q10):	3.89 m³s^-1
61-90 Av. Ann. Rainfall:	772 mm

Sample Hydrograph of Gauged Daily Flows

Flow Duration Curve for Gauged Daily Flows

Station Description

Compound Crump weir (crests: 2.5m and 4.5m wide) with crest-tapping (but d/s levels used for drowning adjustment; may reduce flows too much). Drowning now more frequent during high flows due to reduced channel capacity d/s. Bypassing during extreme floods e.g. during winter of 2000/01. Groundwater-fed regime but notable seasonal recoveries during wet autumns. Artificial influences evident at low flows. Runoff somewhat diminished by gw abstractions but more than compensated by effluent imports from Cirencester.

Catchment Description

Mixed geology: Thames rises on the Cotswolds (Oolitic L'st); lower catchment is chiefly Oxford Clay. Land use: primarily agricultural. Extensive gravel workings in the main valley.

Factors Affecting Runoff

Runoff reduced by public water supply abstraction.
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):	1972 to 2008
Monthly Catchment Rainfall (rnf):	1971 to 2008

Datatype	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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