027002 Wharfe at Flint Mill Weir 2005
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 35.600 7.140 10.700 6.680 10.500 5.770 3.440 2.780 7.980 34.400 12.300 7.530
2 40.200 6.640 14.500 6.370 9.050 11.900 3.400 2.800 5.780 14.800 42.800 36.700
3 26.200 6.330 10.500 5.990 23.900 13.800 3.260 2.890 3.340 8.110 55.900 39.900
4 26.700 6.030 13.700 5.930 17.100 8.650 3.570 2.840 2.370 6.680 93.400 31.700
5 29.600 5.820 15.300 6.940 10.500 11.800 4.200 2.830 1.710 5.520 33.400 27.800
6 32.500 5.780 10.700 29.600 8.740 9.510 5.360 2.880 3.190 5.040 48.000 17.000
7 151.000 6.050 8.970 30.800 8.010 6.950 4.800 2.950 2.650 4.510 28.600 14.500
8 187.000 5.770 9.390 16.600 9.090 5.780 3.620 2.770 3.160 4.210 67.100 11.700
9 58.100 5.830 11.400 9.810 10.100 5.190 3.280 2.710 15.600 4.200 45.000 10.200
10 40.800 28.500 12.000 8.210 7.780 5.070 2.960 3.070 12.300 4.380 28.500 9.900
11 26.600 13.200 22.800 7.100 6.670 4.820 2.790 2.850 6.640 4.190 38.800 13.800
12 22.400 99.900 17.800 6.540 6.090 4.900 2.740 3.270 4.630 8.930 35.600 11.500
13 24.000 32.400 9.810 7.950 5.690 4.910 3.280 5.280 4.210 14.900 22.200 9.650
14 18.500 17.400 7.880 12.900 5.390 4.860 2.980 7.230 5.770 7.640 15.900 8.600
15 14.900 12.500 47.500 26.800 5.120 5.680 2.660 4.780 8.630 5.760 14.500 7.990
16 13.600 10.100 24.900 42.500 5.170 6.590 2.530 3.820 15.300 4.910 12.600 7.580
17 35.400 9.100 17.600 24.400 4.990 11.900 2.480 3.420 7.560 4.560 10.300 7.420
18 39.300 8.400 25.800 57.700 4.860 8.970 2.470 3.200 5.310 4.480 9.290 6.640
19 40.200 7.820 18.400 28.600 5.190 7.260 2.520 3.080 4.490 4.460 8.340 6.710
20 51.500 6.920 11.600 30.000 5.200 6.430 2.400 2.950 4.040 5.600 7.740 7.090
21 32.800 7.020 9.160 19.000 5.780 4.820 2.310 2.850 3.990 9.910 7.320 7.240
22 18.800 7.260 10.900 12.900 6.900 4.630 2.330 2.950 3.780 18.700 6.840 9.660
23 13.700 6.650 12.500 10.900 6.700 4.250 2.330 2.870 3.730 13.800 6.540 8.930
24 11.400 8.880 9.570 9.340 18.800 4.070 2.310 5.440 4.390 97.600 6.730 11.600
25 10.200 8.910 8.010 7.750 19.400 3.860 2.340 12.700 4.200 79.700 6.650 8.190
26 10.100 10.500 7.480 9.110 11.500 3.630 2.280 7.550 4.000 62.000 6.510 7.240
27 10.100 10.300 6.990 11.400 7.320 3.490 2.250 7.010 5.480 39.800 7.860 7.160
28 9.600 9.190 12.600 9.240 6.260 3.430 4.550 6.020 9.000 19.600 8.230 6.370
29 8.660 10.400 10.600 5.710 3.700 4.810 4.620 22.700 14.000 6.860 6.160
30 7.780 7.840 9.280 4.770 3.650 4.580 6.780 19.000 14.100 6.080 7.170
31 7.280 6.970 4.950 3.390 5.640 16.300 56.700
Average 34.020 13.230 13.670 16.030 8.620 6.342 3.168 4.285 6.831 17.510 23.330 13.880
Lowest 7.280 5.770 6.970 5.930 4.770 3.430 2.250 2.710 1.710 4.190 6.080 6.160
Highest 187.000 99.900 47.500 57.700 23.900 13.800 5.360 12.700 22.700 97.600 93.400 56.700
Monthly total
(million cu m) 91.11 32.00 36.61 41.55 23.09 16.44 8.49 11.48 17.71 46.90 60.47 37.18
Runoff (mm) 120 42 48 55 30 22 11 15 23 62 80 49
Rainfall (mm) 132 73 54 112 65 51 59 80 90 123 109 71
Statistics of monthly data for previous record (Oct 1955 to Dec 2004)
Mean Avg. 28.200 24.790 21.120 15.520 10.340 7.394 6.936 10.640 12.290 18.220 23.170 27.770
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. 100 80 75 53 36 25 24 38 42 64 79 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. 118 93 90 79 73 77 80 97 99 114 112 128
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
2005
For 2005 For record As % of $ Reservoir(s) in catchment.
preceding 2005 pre-2005 $ Abstraction for public water supplies.
Mean flow 13.410 17.170 78 $ 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 3.168 Jul 0.991 Aug 1976 groundwater.
Highest monthly mean 34.020 Jan 71.210 Feb 2002
Lowest daily mean 1.710 5 Sep 0.425 23 Jun 1957
Highest daily mean 187.000 8 Jan 292.900 23 Feb 1991
10% exceedance 30.490 40.980 74
50% exceedance 7.697 9.221 83
95% exceedance 2.756 2.406 115
Annual total (million cu m) 422.90 541.90 78
Annual runoff (mm) 557 714 78
Annual rainfall (mm) 1019 1160 88
{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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