027002 Wharfe at Flint Mill Weir 2004
Measuring authority: EA Grid reference: 44 (SE) 422 473 Catchment area (sq km): 758.9
First year: 1936 Level stn. (m OD): 13.70 Max alt. (m OD): 704
Daily mean gauged discharges (cubic metres per second)
DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1 21.700 88.800 4.960 5.610 6.190 3.150 11.800 2.840 7.530 6.260 10.700 7.520
2 32.100 67.100 4.840 6.890 5.700 2.990 7.550 3.060 6.860 14.200 9.950 7.450
3 18.200 128.000 5.580 16.600 5.380 3.160 37.600 3.140 6.150 22.100 10.800 7.030
4 17.500 137.000 5.470 37.100 10.700 3.110 34.500 6.560 5.680 55.800 14.200 7.710
5 34.100 85.100 7.300 26.000 11.700 3.250 18.500 6.970 5.330 25.700 12.800 7.730
6 56.500 38.100 6.640 20.100 15.400 3.060 9.140 4.430 5.110 42.300 11.300 7.440
7 23.600 30.400 6.370 13.600 9.450 2.930 6.460 3.680 4.790 28.000 12.000 7.800
8 43.400 34.500 5.670 10.300 7.650 2.950 5.340 3.230 4.770 15.900 10.400 7.400
9 73.500 23.500 5.480 8.320 7.220 2.850 4.590 24.300 4.880 10.900 9.320 6.680
10 35.000 22.100 5.260 7.390 6.330 2.810 5.100 168.000 4.800 8.660 8.220 6.150
11 52.200 21.500 4.780 6.790 6.340 2.940 4.320 61.200 4.680 7.400 7.220 5.770
12 49.900 15.000 4.900 6.860 5.600 2.830 4.080 48.300 5.020 7.250 7.490 7.390
13 54.100 12.400 4.650 6.910 4.950 2.790 3.830 44.100 19.500 8.360 7.730 6.960
14 35.200 10.900 4.740 5.860 4.610 2.700 3.650 19.900 10.600 11.600 7.600 6.020
15 36.500 9.830 9.920 5.570 4.460 2.560 3.740 12.800 9.870 10.900 7.910 28.500
16 65.800 8.900 13.200 6.930 4.220 2.590 3.840 9.780 7.250 12.500 16.600 15.200
17 29.700 9.280 8.340 12.700 4.020 2.570 4.970 10.300 6.410 13.300 46.700 33.500
18 20.100 8.810 6.440 41.100 3.870 2.760 9.530 18.500 8.210 9.630 26.800 24.600
19 26.300 8.010 18.800 25.700 3.710 2.820 5.850 26.500 14.600 7.480 19.100 17.800
20 32.200 7.490 40.200 16.500 3.690 3.010 4.840 123.000 57.100 23.800 13.000 11.100
21 23.400 6.990 32.400 13.000 3.610 2.980 4.570 43.000 63.000 84.500 10.900 9.900
22 16.900 6.480 23.200 29.800 3.440 3.020 3.920 23.000 22.600 95.700 46.200 69.900
23 18.800 6.070 14.000 15.200 3.300 12.300 3.590 20.500 14.500 124.000 23.600 60.900
24 20.100 6.070 10.200 10.400 3.210 11.300 3.320 24.800 10.300 57.600 15.200 50.600
25 14.800 5.990 9.100 8.470 3.130 6.580 3.140 21.600 7.870 73.800 12.600 35.700
26 12.000 5.580 8.640 7.630 3.090 5.020 5.090 13.700 6.680 39.100 16.300 18.200
27 10.300 5.520 7.570 8.210 3.010 4.060 3.980 26.500 8.600 23.900 13.800 13.500
28 9.520 5.390 7.420 8.000 2.960 3.760 3.210 14.400 8.100 18.400 11.600 53.900
29 9.010 5.150 6.790 7.670 3.000 3.630 3.070 10.400 11.200 17.700 9.930 26.900
30 15.600 6.250 6.910 3.180 5.480 3.110 13.500 7.510 16.800 8.360 28.100
31 157.000 5.760 3.170 2.910 9.290 12.900 75.600
Average 34.360 28.270 9.835 13.400 5.364 3.865 7.392 26.490 11.980 29.240 14.610 21.710
Lowest 9.010 5.150 4.650 5.570 2.960 2.560 2.910 2.840 4.680 6.260 7.220 5.770
Highest 157.000 137.000 40.200 41.100 15.400 12.300 37.600 168.000 63.000 124.000 46.700 75.600
Monthly total
(million cu m) 92.02 70.84 26.34 34.74 14.37 10.02 19.80 70.96 31.06 78.32 37.87 58.14
Runoff (mm) 121 93 35 46 19 13 26 94 41 103 50 77
Rainfall (mm) 146 96 53 99 33 79 80 225 71 173 60 101
Statistics of monthly data for previous record (Oct 1955 to Dec 2003)
Mean Avg. 28.070 24.720 21.350 15.560 10.440 7.468 6.926 10.310 12.300 17.990 23.350 27.900
flows: Low 4.472 2.974 5.740 4.496 2.312 1.545 1.674 0.991 1.419 3.026 6.537 4.832
(year) 1963 1963 1993 1974 1980 1957 1976 1976 1959 1972 1995 1995
High 44.230 71.210 53.940 35.240 26.750 18.530 16.440 41.340 33.520 54.000 66.610 62.090
(year) 1995 2002 1981 1970 1967 1972 1963 1956 1968 1967 2000 1965
Runoff: Avg. 99 79 75 53 37 26 24 36 42 64 80 98
Low 16 9 20 15 8 5 6 4 5 11 22 17
High 156 227 190 120 94 63 58 146 115 191 228 219
Rainfall: Avg. 117 93 91 78 74 77 80 95 99 112 113 129
Low 12 14 24 8 13 18 20 12 8 32 33 41
High 217 285 222 152 181 183 185 226 241 257 242 234
Summary statistics Factors affecting runoff
2004
For 2004 For record As % of $ Reservoir(s) in catchment.
preceding 2004 pre-2004 $ Abstraction for public water supplies.
Mean flow 17.220 17.170 100 $ Flow reduced by industrial and/or
Lowest yearly mean 10.430 1996 agricultural abstractions.
Highest yearly mean 26.320 2000 $ Augmentation from surface water and/or
Lowest monthly mean 3.865 Jun 0.991 Aug 1976 groundwater.
Highest monthly mean 34.360 Jan 71.210 Feb 2002
Lowest daily mean 2.560 15 Jun 0.425 23 Jun 1957
Highest daily mean 168.000 10 Aug 292.900 23 Feb 1991
10% exceedance 39.810 41.000 97
50% exceedance 8.696 9.228 94
95% exceedance 2.996 2.391 125
Annual total (million cu m) 544.50 541.80 100
Annual runoff (mm) 718 714 100
Annual rainfall (mm) 1216 1158 105
{1961-90 rainfall average (mm) 1161}
Station and catchment description
Broad-crested masonry weir 47m wide; c/m cableway originally 1.5km u/s then moved to new ultrasonic station at Tadcaster
in 1990. Insensitive at low flows. Does not drown at high flows, though small amount of bypassing on the right bank.
Level data: 1936-1955. Recalibration (from 1965) completed but flows reprocessed from 1982 only. Pre-1965 data less
reliable. Mill race opened in early 1990s (not rated) so flows not reliable. Regulation effect of headwater reservoirs
evident at low flows. Small net export of water (inc. Bradford supply).
Mixed geology of moderate permeability - mainly Carboniferous Limestone, grits and Coal Measures with over 40%
superficial deposits. Predominantly mixed rural catchment, 60% grassland, with moorland headwaters.
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