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Table 1

Details of selected long hydrometric records, derived from the NRFA website (www.nrfa.ac.uk)

NRFA IDRiverNameAreaStart yearEnd yearCatchment Area (km2)Mean elevation (m)Base Flow Indexa (BFI)Standard-period annual average rainfall (SAAR)b (mm)Comment on record homogeneity
12001 Dee Woodend ES 1929 2017 1,370 513.0 0.53 1,108 – 
27001 Nidd Hunsingore Weir NEE 1933 2017 484.3 195.4 0.48 962 Trends calculated on digital record post-1966 
38002 Ash Mardock ANG 1939 2017 78.7 93.7 0.53 619 Old station (pre-1979) subject to bypassing 
39001 Thames Kingston SE 1882 2017 9,948 108.9 0.63 706 AMAX derived from naturalised series. Complex station history (see NRFA) but series used in long-term flood trend studies (Marsh & Harvey 2012) 
54001 Severn Bewdley ST 1921 2017 4,325 175.5 0.53 912 – 
55002 Wye Belmont SWESW 1908 2017 1,895.9 298.0 0.46 1,230 Flows prior to 1932 are considered unreliable but not rejected from Peak Flow Dataset 
69025 Irwell Manchester Racecourse NWENW 1941 2017 557 213.6 0.62 1,260 1970 Flood Attenuation Storage works increased channel conveyance and flood storage basin built 2000 
84005 Clyde Blairston WS 1955 2017 1,704.2 279.0 0.44 1,139 – 
NRFA IDRiverNameAreaStart yearEnd yearCatchment Area (km2)Mean elevation (m)Base Flow Indexa (BFI)Standard-period annual average rainfall (SAAR)b (mm)Comment on record homogeneity
12001 Dee Woodend ES 1929 2017 1,370 513.0 0.53 1,108 – 
27001 Nidd Hunsingore Weir NEE 1933 2017 484.3 195.4 0.48 962 Trends calculated on digital record post-1966 
38002 Ash Mardock ANG 1939 2017 78.7 93.7 0.53 619 Old station (pre-1979) subject to bypassing 
39001 Thames Kingston SE 1882 2017 9,948 108.9 0.63 706 AMAX derived from naturalised series. Complex station history (see NRFA) but series used in long-term flood trend studies (Marsh & Harvey 2012) 
54001 Severn Bewdley ST 1921 2017 4,325 175.5 0.53 912 – 
55002 Wye Belmont SWESW 1908 2017 1,895.9 298.0 0.46 1,230 Flows prior to 1932 are considered unreliable but not rejected from Peak Flow Dataset 
69025 Irwell Manchester Racecourse NWENW 1941 2017 557 213.6 0.62 1,260 1970 Flood Attenuation Storage works increased channel conveyance and flood storage basin built 2000 
84005 Clyde Blairston WS 1955 2017 1,704.2 279.0 0.44 1,139 – 

aThe BFI is a measure of the proportion of the river runoff that derives from stored sources; the more permeable the rock, superficial deposits and soils in a catchment, the higher the baseflow and the more sustained the river's flow during periods of dry weather (https://nrfa.ceh.ac.uk/derived-flow-statistics).

bThe average annual rainfall over the catchment for 1961–1990. This statistic is derived from the SAAR map for 1961–1990, a 1-km grid based on data from the Met Office, rather than a catchment rainfall series (https://nrfa.ceh.ac.uk/rainfall-statistics).

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