| Grid Reference: | 51 (TQ) 262 462 |
| Operator: | EA |
| Local number: | 3240 |
| Catchment Area: | 142.0 km2 |
| Level of Station: | 48.0 mOD |
| Max. Altitude: | 178.0 mOD |
Rectangular flume, 7.1m wide at throat, plus 1.48m rectangular side sluice. Calibration based on current meter gaugings which extend beyond bankfull. Bypassing occurs at flows >30m3s-1; flows therefore uncertain in the highest range. Responsive regime (reflecting growing urban contribution) and substantial effluent component (STWs at Crawley, Horley and Burstow) with a significant net import which has increasing over time (runoff therefore unrepresentative); otherwise moderate impact of artificial influences.
A largely impervious catchment (mostly Weald Clay) but more permeable headwaters. Very mixed land use - rural tracts but with substantial urban centres; Crawley and Gatwick Airport are in the catchment. Notable urban growth since station commissioned.
For further information see the Explanatory Notes.
Long term hydrograph (A4 PDF)
Long term data file (csv - comma separated value format)
| 1972 | 1973 | 1974 | 1976 | 1977 | 1978 | 1979 | |||
| 1980 | 1981 | 1982 | 1983 | 1984 | 1985 | 1986 | 1987 | 1988 | 1989 |
| 1990 | 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 |
| 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 |