027002 Wharfe at Flint Mill Weir 1964
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 26.050 29.170 7.815 8.920 16.200 5.918 2.073 3.738 3.879 3.568 3.879 8.297
2 15.520 18.010 7.985 9.033 13.030 5.663 2.146 3.794 3.851 3.653 4.927 6.994
3 11.550 18.070 7.476 8.722 22.200 8.325 2.044 3.794 3.823 1.914 4.078 17.100
4 9.231 17.470 6.201 7.221 28.090 7.532 1.790 3.568 3.823 2.313 3.710 9.798
5 8.892 10.990 6.485 6.456 17.870 11.440 2.107 3.993 2.313 4.559 3.511 7.108
6 7.872 8.297 6.201 6.343 12.290 8.665 3.115 4.361 2.888 3.058 3.625 14.410
7 7.617 7.108 4.417 5.918 9.911 14.300 2.115 7.957 4.361 34.260 2.384 72.770
8 7.504 6.683 4.304 6.485 12.690 11.130 32.850 5.493 3.256 38.790 2.735 43.040
9 7.277 6.032 5.947 6.286 14.100 6.994 12.630 7.051 3.172 16.910 4.134 152.100
10 6.371 6.683 7.249 6.003 19.140 6.173 16.200 6.966 12.800 10.360 3.370 47.290
11 5.777 6.456 8.184 4.701 56.630 5.975 24.210 5.607 12.970 7.646 3.313 26.140
12 5.522 5.692 6.400 4.871 43.330 4.871 14.040 4.871 8.778 6.513 3.370 119.500
13 7.249 5.805 6.286 9.656 18.830 5.692 8.467 4.333 4.984 5.352 7.306 155.700
14 8.552 5.380 52.100 7.759 12.380 5.295 5.862 3.964 4.899 5.125 20.110 49.920
15 14.840 4.474 66.550 11.210 9.684 6.003 5.465 3.653 5.069 5.182 15.630 27.670
16 10.870 4.474 27.350 8.014 7.646 7.362 7.079 3.511 8.382 5.182 28.880 17.870
17 8.438 6.116 19.260 7.872 6.456 6.003 5.437 5.125 20.330 4.021 18.460 13.760
18 6.739 5.324 15.720 7.731 5.975 6.570 27.550 8.637 10.480 4.134 11.180 11.610
19 6.116 5.295 14.780 8.269 5.777 6.088 55.220 15.290 7.674 4.842 20.870 9.146
20 10.510 5.040 23.280 29.170 5.805 4.955 23.500 11.500 9.090 3.370 15.830 8.722
21 14.390 5.154 63.150 18.970 5.069 4.559 13.420 6.881 8.722 4.927 9.684 8.920
22 9.713 3.681 38.230 17.900 6.060 3.851 9.373 4.757 6.796 5.522 7.646 9.260
23 8.637 7.051 24.010 17.980 7.079 3.681 8.976 4.049 9.005 7.815 23.140 9.260
24 8.212 25.340 54.940 16.480 4.871 3.058 7.306 12.040 6.428 7.193 44.740 7.844
25 6.570 25.830 110.700 11.950 5.777 2.730 5.635 9.203 5.437 5.295 41.060 6.683
26 6.286 14.100 37.660 10.560 4.842 2.718 6.513 6.570 3.964 5.890 17.440 5.692
27 7.674 10.760 22.910 11.780 4.701 2.333 6.286 5.069 3.908 5.437 17.300 5.607
28 12.800 9.458 18.520 11.950 4.531 2.498 4.955 4.559 4.842 5.239 13.220 5.833
29 12.830 9.061 15.180 19.480 4.333 2.633 4.616 2.860 4.134 4.984 10.760 6.654
30 47.860 13.220 18.380 2.973 2.297 4.106 3.313 4.389 4.871 9.260 50.400
31 31.430 10.450 3.964 3.908 4.417 3.568 28.600
Average 11.580 10.100 23.000 10.870 12.650 5.844 10.610 5.836 6.482 7.468 12.520 31.090
Lowest 5.522 3.681 4.304 4.701 2.973 2.297 1.790 2.860 2.313 1.914 2.384 5.607
Highest 47.860 29.170 110.700 29.170 56.630 14.300 55.220 15.290 20.330 38.790 44.740 155.700
Monthly total
(million cu m) 31.01 25.32 61.60 28.17 33.89 15.15 28.43 15.63 16.80 20.00 32.45 83.26
Runoff (mm) 41 33 81 37 45 20 37 21 22 26 43 110
Rainfall (mm) 48 38 127 74 74 71 102 66 56 54 69 127
Statistics of monthly data for previous record (Oct 1955 to Dec 1963)
Mean Avg. 27.610 23.250 16.780 14.150 8.953 5.345 9.368 15.300 13.330 14.990 20.840 24.730
flows: Low 4.472 2.974 6.741 5.197 3.911 1.545 3.601 1.795 1.419 6.597 6.876 10.230
(year) 1963 1963 1961 1957 1960 1957 1959 1959 1959 1955 1958 1963
High 39.260 47.220 36.400 22.280 17.780 14.450 16.440 41.340 22.270 25.440 51.090 40.190
(year) 1961 1958 1963 1962 1958 1958 1963 1956 1956 1958 1963 1959
Runoff: Avg. 97 75 59 48 32 18 33 54 46 53 71 87
Low 16 9 24 18 14 5 13 6 5 23 23 36
High 139 151 128 76 63 49 58 146 76 90 174 142
Rainfall: Avg. 110 81 60 71 63 69 95 113 92 101 97 122
Low 41 20 28 10 25 33 35 18 8 46 33 41
High 165 178 112 130 122 140 185 226 135 165 211 203
Summary statistics Factors affecting runoff
1964
For 1964 For record As % of $ Reservoir(s) in catchment.
preceding 1964 pre-1964 $ Abstraction for public water supplies.
Mean flow 12.390 16.200 76 $ 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 5.836 Aug 1.419 Sep 1959 groundwater.
Highest monthly mean 31.090 Dec 51.090 Nov 1963
Lowest daily mean 1.790 4 Jul 0.425 23 Jun 1957
Highest daily mean 155.700 13 Dec 233.600 4 Dec 1960
10% exceedance 25.410 39.720 64
50% exceedance 7.110 8.579 83
95% exceedance 2.925 2.117 138
Annual total (million cu m) 391.80 511.20 77
Annual runoff (mm) 516 674 77
Annual rainfall (mm) 906 1074 84
{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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