027002 Wharfe at Flint Mill Weir 1963
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 5.295 4.163 2.577 18.940 7.957 3.540 49.560 2.645 13.900 14.410 9.911 15.070
2 5.578 2.707 2.078 19.480 9.458 3.483 57.200 2.178 14.020 21.070 9.061 14.300
3 5.578 3.228 2.526 13.990 7.306 3.143 51.250 1.968 14.500 54.090 8.297 13.560
4 5.862 4.134 3.653 11.840 7.221 3.256 28.880 2.662 12.540 38.230 7.136 11.610
5 5.437 3.143 40.490 12.600 5.805 4.389 51.820 9.203 10.280 33.700 7.702 9.260
6 5.295 3.002 188.900 33.700 8.070 3.653 32.000 13.820 8.014 25.290 16.080 8.070
7 5.663 2.973 82.690 24.520 6.456 3.030 29.730 6.853 6.853 30.580 15.350 8.184
8 5.267 3.058 49.560 16.990 5.918 3.228 19.030 7.985 12.380 23.760 17.420 8.070
9 5.352 2.639 59.180 12.150 5.692 2.803 14.580 7.617 38.510 31.150 25.540 7.646
10 4.587 2.818 82.690 10.340 6.570 2.801 12.260 7.476 25.600 17.640 70.790 6.343
11 4.021 3.681 48.420 10.220 11.180 2.297 11.750 12.600 12.660 13.930 52.670 5.522
12 3.625 3.087 27.210 11.530 9.996 2.356 10.340 10.050 9.061 11.550 87.220 6.230
13 3.710 2.888 19.600 9.911 9.458 3.511 8.863 21.830 7.702 10.310 60.880 6.570
14 3.993 3.002 44.180 45.870 10.450 2.917 7.193 10.530 5.692 10.110 48.710 4.729
15 3.455 3.087 45.020 88.630 8.495 2.005 7.532 7.193 5.239 8.835 72.770 5.267
16 4.304 2.557 34.260 33.410 8.325 2.186 23.480 5.720 6.570 19.200 32.000 7.759
17 4.078 2.653 35.400 32.280 7.249 3.568 13.080 8.778 5.522 13.250 33.700 7.532
18 4.163 3.313 41.630 54.940 6.088 2.735 11.160 7.985 5.522 9.996 154.600 7.221
19 3.058 2.860 28.600 28.600 6.286 3.002 10.220 7.306 5.182 7.759 90.900 6.286
20 3.030 2.818 18.290 20.020 7.136 3.653 8.467 4.955 4.814 7.815 53.800 5.012
21 4.531 2.781 13.680 22.170 31.430 3.483 7.561 5.607 2.792 8.297 129.100 3.993
22 3.228 2.750 10.650 19.370 20.700 3.936 6.626 5.975 3.370 7.957 115.500 4.248
23 3.540 2.299 8.920 17.530 11.980 4.927 5.748 6.060 5.125 10.340 62.860 4.927
24 3.455 2.475 8.297 12.150 9.486 4.134 5.267 17.440 4.502 15.940 68.810 3.964
25 3.511 3.115 71.080 10.450 8.495 22.200 4.899 14.950 6.485 10.820 68.810 9.175
26 3.568 2.682 38.510 8.920 6.881 35.680 4.842 21.830 84.390 7.702 103.900 14.360
27 3.738 2.619 20.760 7.759 6.739 16.340 3.143 40.210 27.100 6.683 39.640 10.390
28 5.210 2.733 18.290 7.419 6.145 17.440 3.200 25.090 15.660 6.824 26.680 10.620
29 5.833 20.980 7.759 5.550 41.910 4.163 12.660 33.410 5.862 24.100 11.040
30 5.805 33.980 7.221 5.097 38.230 3.002 9.628 23.450 5.550 18.720 21.720
31 4.871 26.250 4.701 2.815 25.290 5.748 58.330
Average 4.472 2.974 36.400 21.020 8.785 8.328 16.440 11.100 14.360 15.950 51.090 10.230
Lowest 3.030 2.299 2.078 7.221 4.701 2.005 2.815 1.968 2.792 5.550 7.136 3.964
Highest 5.862 4.163 188.900 88.630 31.430 41.910 57.200 40.210 84.390 54.090 154.600 58.330
Monthly total
(million cu m) 11.98 7.19 97.49 54.49 23.53 21.59 44.03 29.73 37.23 42.72 132.40 27.39
Runoff (mm) 16 9 128 72 31 28 58 39 49 56 174 36
Rainfall (mm) 41 41 112 97 56 140 74 127 89 84 211 41
Statistics of monthly data for previous record (Oct 1955 to Dec 1962)
Mean Avg. 30.920 26.150 13.980 13.160 8.977 4.919 8.357 15.900 13.190 14.870 17.050 26.540
flows: Low 24.320 7.996 6.741 5.197 3.911 1.545 3.601 1.795 1.419 6.597 6.876 16.850
(year) 1956 1959 1961 1957 1960 1957 1959 1959 1959 1955 1958 1962
High 39.260 47.220 22.520 22.280 17.780 14.450 14.000 41.340 22.270 25.440 45.900 40.190
(year) 1961 1958 1957 1962 1958 1958 1960 1956 1956 1958 1960 1959
Runoff: Avg. 109 84 49 45 32 17 29 56 45 52 58 94
Low 86 25 24 18 14 5 13 6 5 23 23 59
High 139 151 79 76 63 49 49 146 76 90 157 142
Rainfall: Avg. 119 86 54 67 64 61 97 111 92 103 83 132
Low 77 20 28 10 25 33 35 18 8 46 33 84
High 165 178 86 130 122 112 185 226 135 165 198 203
Summary statistics Factors affecting runoff
1963
For 1963 For record As % of $ Reservoir(s) in catchment.
preceding 1963 pre-1963 $ Abstraction for public water supplies.
Mean flow 16.800 16.140 104 $ 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 2.974 Feb 1.419 Sep 1959 groundwater.
Highest monthly mean 51.090 Nov 47.220 Feb 1958
Lowest daily mean 1.968 3 Aug 0.425 23 Jun 1957
Highest daily mean 188.900 6 Mar 233.600 4 Dec 1960
10% exceedance 40.760 39.370 104
50% exceedance 8.157 8.650 94
95% exceedance 2.702 2.004 135
Annual total (million cu m) 529.80 509.30 104
Annual runoff (mm) 698 671 104
Annual rainfall (mm) 1113 1069 104
{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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