55007 - Wye at Erwood

Grid Reference:	32 (SO) 076 445
Operator:	EA
Local number:	55007
Catchment Area:	1282.1 km²
Level of Station:	106.4 mOD
Max. Altitude:	752.0 mOD
Mean flow:	37.36 m³s^-1
95% exceedance (Q95):	4.441 m ³s^-1
10% exceedance (Q10):	92.89 m³s^-1
61-90 Av. Ann. Rainfall:	1387 mm

Sample Hydrograph of Gauged Daily Flows

Flow Duration Curve for Gauged Daily Flows

Station Description

Velocity-area station with a massive rock bar as a control. Bankfull width approx. 64m, cableway span 81m. All but the highest flows (which spread slightly onto narrow terrace on rb) contained. POR max.(taken from the HiFlows database) in Dec. 1960 is under review - considerable rating extrapolation involved. Substantial flow modification from regulation and abstraction from the Elan, PWS and sewage effluent. Some naturalised sequences available.

Catchment Description

Large wet upland catchment draining impermeable rocks - metamorphosed Palaeozoic sediments and an igneous complex. Summit levels exceed 600m. Predominantly (70%) grassland catchment with extensive grazing, moorland, and patches of forest.

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):	1937 to 2008
Naturalised Daily Flows (ndf):	1970 to 1982
Naturalised Monthly Flows (nmf):	1938 to 1971
Monthly Catchment Rainfall (rnf):	1937 to 2008

Datatype	1930s										1940s										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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