028085 Derwent at St. Marys Bridge

Grid Reference:	43 (SK) 355 368
Operator:	EA
Local number:	4085
Catchment Area:	1054.0 km2
Level of Station:	44.0 mOD
Max. Altitude:	636.0 mOD

Station Description

Ten-channel, interleaved cross path US gauge in the centre of Derby. Opened in 1984, ultrasonic gauge reconfigured in March 1993. All flows contained. Record combined with 28010 (1.75km u/s) - long, curved broad-crested masonry weir - complex rating history, very insensitive. Small degree of bypassing. Substantial flow modification owing to Derwent reservoirs, mill operations (particularly before 1970s), and PWS abstractions.

Catchment Description

Large, predominantly upland catchment draining Millstone Grit and Carboniferous Limestone. Lower reaches drain Coal Measures on the lb and Triassic sandstones and marls on the rb. Peat moorland headwaters; forestry, pasture and some arable. Contains the towns of Matlock and Buxton.

Factors Affecting Runoff

• Reservoir(s) in catchment affect runoff.
• Regulation from surface water and/or ground water.
• Runoff reduced by public water supply abstraction.
• Runoff influenced by groundwater abstraction/recharge.
• Runoff increased by effluent returns.
• Runoff reduced by industrial/agricultural abstraction.

Download Options

For further information see the Explanatory Notes.

Long term hydrograph (A4 PDF)

Annual Flow Tabulations

					1935	1936	1937	1938	1939
1940	1941	1942	1943	1944	1945	1946	1947	1948	1949
1950	1951	1952	1953	1954	1955	1956	1957	1958	1959
1960	1961	1962	1963	1964	1965	1966	1967	1968	1969
1970	1971	1972	1973	1974	1975	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