Both daily gauged and daily naturalised data are available for this station. Click here for gauged flow data.
| Grid Reference: | 52 (TL) 390 092 |
| Operator: | EA |
| Local number: | 5290 |
| Catchment Area: | 1036.0 km2 |
| Level of Station: | 27.7 mOD |
| Max. Altitude: | 229.0 mOD |
From 1/1/97, flows normally sum of 38027 and 38031 (but occasional erratic performance of these US stations can impact on the precision of Feildes Weir flows; recent flows are under review). Previously: thin-plate weir (insensitive - 29m wide) and 3 vertical-lift sluices; completed 1978 to improve hydrometric range and precision. Model rated. All flows (bar lockages) now contained but Ryemeads STW effluent bypasses. Pre-1978: barrage of gates/sluices (operation evident on hydrographs, pre-1930 especially); no peak flows prior to 1965, low flows probably under-estimated. Station out of commission in 1976 but late summer flows probably the lowest on record. Mill operation could produce particularly low flows in the early record (e.g. on Sundays). Gauging instigated by Beardmore in 1850s (flood of Oct. 1857 estimated as >250 cumecs, greatly exceeding any subsequent event). Significant g/w abstraction; net export from catchment. Naturalised flows (New River abstraction only) from 1883.
A mainly pervious (Chalk) catchment with extensive Drift cover. Predominantly rural headwaters; significant urban growth in lower valley.
For further information see the Explanatory Notes.
Long term hydrograph (A4 PDF)
Long term data file (csv - comma separated value format)