| Grid Reference: | 51 (TQ) 000 478 |
| Operator: | EA |
| Local number: | 3079 |
| Catchment Area: | 59.0 km2 |
| Level of Station: | 31.7 mOD |
| Max. Altitude: | 294.0 mOD |
Crump weir, 5.5m broad immediately d/s of ornamental pond. High flows often overestimated (backing-up from Wey causes drowning, crest-tapping operational but often blocked); some future revision of high flows anticipated. Substantial baseflow component to flow regime but also responsive to heavy rainfall. Some artificial flow regulation and very minor effect of abstractions and discharges. Sensibly natural runoff pattern.
Geology: dominated by the Lower Greensand - nominally pervious but large clay component. The main valley is broad, but the headwaters drain the North Downs scarp, hilly terrain to the south also. A rural catchment with substantial woodland and many scattered settlements.
For further information see the Explanatory Notes.
Long term hydrograph (A4 PDF)
Long term data file (csv - comma separated value format)