027002 Wharfe at Flint Mill Weir 1962
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 5.918 41.630 6.683 9.146 4.955 4.644 2.265 3.681 7.306 21.520 46.720 5.692
2 5.380 18.520 6.768 36.250 5.154 2.888 3.228 4.021 6.032 12.910 37.100 5.380
3 6.768 13.760 6.683 121.200 5.069 3.370 2.268 3.313 5.380 9.033 16.570 5.267
4 7.221 18.290 6.343 35.680 4.616 4.502 2.192 14.870 6.683 6.683 10.450 5.522
5 7.957 46.160 6.881 30.580 3.681 4.021 2.251 7.589 7.957 4.955 8.297 5.012
6 40.490 28.880 5.380 24.320 3.993 3.653 2.192 5.182 8.722 5.380 8.297 3.766
7 32.850 25.060 5.805 85.230 4.842 3.653 1.858 6.456 12.490 4.729 7.646 4.304
8 27.550 23.020 6.343 62.580 5.918 3.370 1.685 11.100 9.571 4.842 7.419 9.515
9 36.530 14.950 6.456 40.780 11.950 2.294 2.472 6.428 7.419 4.531 7.221 64.000
10 24.210 13.030 9.458 25.170 11.840 2.444 2.537 28.880 13.990 4.191 9.458 24.440
11 80.990 13.450 24.210 17.640 7.419 2.492 3.256 59.470 38.790 4.078 10.760 35.110
12 67.960 178.100 14.220 14.840 5.154 2.699 3.625 27.270 74.760 3.341 9.260 28.600
13 46.160 66.550 10.450 11.300 4.531 3.738 3.710 10.960 29.450 2.789 7.306 14.950
14 50.970 31.430 8.722 8.920 4.729 3.908 2.104 7.957 15.910 2.798 6.570 12.060
15 31.720 20.980 7.646 7.646 4.531 3.794 2.189 8.240 11.610 3.766 6.881 40.210
16 76.460 39.080 6.768 8.070 4.955 2.721 2.945 12.380 12.060 2.639 6.456 41.340
17 37.380 25.830 5.692 7.957 9.033 2.826 2.195 10.310 12.490 3.285 5.692 19.260
18 40.490 16.790 5.267 8.184 6.683 3.200 2.044 7.532 8.835 3.030 12.910 15.720
19 34.260 14.220 6.343 9.373 32.280 2.234 2.053 5.663 7.957 2.568 9.996 16.030
20 27.980 11.840 5.607 8.920 19.140 3.738 2.013 4.814 6.994 1.603 8.070 45.020
21 42.480 10.870 6.456 10.450 25.290 3.341 9.571 10.280 6.145 2.291 6.994 37.950
22 42.480 9.911 6.768 24.860 21.950 9.741 18.100 25.940 4.191 3.625 6.230 17.870
23 26.790 8.835 6.032 13.560 12.380 4.842 11.870 27.750 4.191 3.002 5.692 12.150
24 44.460 7.221 4.531 9.260 11.180 3.483 6.230 77.020 4.955 2.701 33.980 10.110
25 53.520 6.881 4.531 7.759 8.495 5.267 6.371 23.980 4.531 2.860 18.290 7.221
26 34.550 7.532 11.180 7.108 6.032 7.108 6.485 35.110 4.842 2.803 12.260 8.184
27 23.900 6.881 16.990 6.032 5.380 7.108 4.531 68.530 4.531 2.149 9.260 6.994
28 16.680 6.683 10.220 5.154 5.918 4.814 3.426 33.700 6.456 9.401 7.646 5.918
29 13.760 9.033 4.955 5.918 3.256 3.256 21.750 9.373 11.950 6.683 3.993
30 11.180 25.290 5.493 5.380 1.914 3.483 13.760 57.770 29.170 6.400 5.069
31 15.070 12.260 4.616 2.917 10.110 28.600 5.607
Average 32.710 25.940 8.871 22.280 8.807 3.902 4.043 19.160 13.710 6.685 11.880 16.850
Lowest 5.380 6.683 4.531 4.955 3.681 1.914 1.685 3.313 4.191 1.603 5.692 3.766
Highest 80.990 178.100 25.290 121.200 32.280 9.741 18.100 77.020 74.760 29.170 46.720 64.000
Monthly total
(million cu m) 87.62 62.76 23.76 57.75 23.59 10.11 10.83 51.33 35.54 17.90 30.80 45.12
Runoff (mm) 115 83 31 76 31 13 14 68 47 24 41 59
Rainfall (mm) 124 86 41 94 76 33 66 152 107 46 58 84
Statistics of monthly data for previous record (Oct 1955 to Dec 1961)
Mean Avg. 30.620 26.190 14.830 11.640 9.005 5.088 9.076 15.350 13.100 16.040 17.790 27.930
flows: Low 24.320 7.996 6.741 5.197 3.911 1.545 3.601 1.795 1.419 6.597 6.876 18.930
(year) 1956 1959 1961 1957 1960 1957 1959 1959 1959 1955 1958 1957
High 39.260 47.220 22.520 19.810 17.780 14.450 14.000 41.340 22.270 25.440 45.900 40.190
(year) 1961 1958 1957 1961 1958 1958 1960 1956 1956 1958 1960 1959
Runoff: Avg. 108 84 52 40 32 17 32 54 45 57 61 99
Low 86 25 24 18 14 5 13 6 5 23 23 67
High 139 151 79 68 63 49 49 146 76 90 157 142
Rainfall: Avg. 118 86 56 63 63 65 102 105 90 111 86 139
Low 77 20 28 10 25 41 35 18 8 61 33 112
High 165 178 86 130 122 112 185 226 135 165 198 203
Summary statistics Factors affecting runoff
1962
For 1962 For record As % of $ Reservoir(s) in catchment.
preceding 1962 pre-1962 $ Abstraction for public water supplies.
Mean flow 14.500 16.360 89 $ Flow reduced by industrial and/or
Lowest yearly mean 12.470 1959 agricultural abstractions.
Highest yearly mean 19.290 1958 $ Augmentation from surface water and/or
Lowest monthly mean 3.902 Jun 1.419 Sep 1959 groundwater.
Highest monthly mean 32.710 Jan 47.220 Feb 1958
Lowest daily mean 1.603 20 Oct 0.425 23 Jun 1957
Highest daily mean 178.100 12 Feb 233.600 4 Dec 1960
10% exceedance 35.780 40.350 89
50% exceedance 7.520 8.828 85
95% exceedance 2.383 1.955 122
Annual total (million cu m) 457.30 516.30 89
Annual runoff (mm) 603 680 89
Annual rainfall (mm) 967 1084 89
{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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