027002 Wharfe at Flint Mill Weir 1960
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 28.880 98.260 55.780 6.145 3.115 3.087 2.149 7.362 6.796 4.417 57.480 32.570
2 22.820 78.160 49.560 6.145 4.304 2.636 1.614 5.805 6.088 6.230 107.300 27.550
3 16.990 75.890 41.060 17.300 3.766 2.741 1.475 5.805 16.680 23.670 69.940 96.560
4 18.290 48.990 43.330 18.290 3.455 1.812 2.492 6.088 10.990 17.530 47.010 233.600
5 28.880 33.130 23.020 12.490 3.455 1.954 2.217 7.957 12.180 12.910 28.290 95.430
6 18.180 21.100 16.790 10.450 3.030 2.237 2.376 8.750 9.373 13.340 20.560 47.010
7 13.880 16.450 13.880 12.260 1.937 2.240 26.190 5.890 10.340 9.684 15.600 30.020
8 11.610 14.100 11.610 8.920 1.614 3.710 9.628 4.984 8.070 18.600 13.680 23.250
9 10.530 12.260 10.650 7.532 3.115 3.596 6.881 4.502 6.654 92.600 12.260 19.790
10 9.458 10.530 16.250 23.560 2.798 7.221 6.881 4.106 7.079 44.460 34.550 17.220
11 8.382 12.380 23.360 36.810 3.540 3.936 17.390 4.163 7.589 22.820 29.450 15.070
12 8.382 10.990 16.680 29.170 3.851 3.087 10.310 3.228 6.032 14.750 20.220 13.030
13 8.495 9.798 16.680 53.520 4.587 5.748 6.598 3.285 5.380 11.530 16.990 11.840
14 7.759 9.373 19.790 50.120 9.203 7.221 27.780 3.256 5.890 9.684 28.880 10.990
15 7.221 8.722 19.790 36.810 5.748 5.040 15.430 4.106 22.880 8.297 22.060 10.450
16 6.881 7.844 19.260 21.750 7.447 3.738 8.099 2.973 11.750 6.994 32.570 9.798
17 6.768 7.844 14.950 14.220 6.456 5.465 13.140 3.200 28.880 6.994 56.630 11.950
18 12.380 7.532 12.150 11.070 5.097 3.964 60.320 3.172 23.530 19.600 44.460 11.840
19 84.390 7.844 10.220 8.835 4.417 3.172 41.340 3.058 14.270 17.130 23.360 11.070
20 41.340 8.495 9.033 7.108 4.304 3.851 30.300 2.183 13.900 27.130 23.020 9.571
21 25.170 10.650 8.722 6.994 3.002 3.256 16.420 2.418 9.571 34.830 45.310 9.033
22 102.200 9.996 7.844 6.456 3.030 2.917 22.540 3.341 10.220 21.100 38.230 7.957
23 62.860 8.382 6.994 4.842 4.163 2.832 20.960 2.945 32.850 18.830 26.250 9.260
24 70.790 7.844 6.683 4.531 3.568 2.789 13.110 3.483 15.490 16.450 101.100 11.530
25 45.590 13.140 6.343 5.154 4.276 1.671 11.840 22.960 10.340 17.220 100.800 9.939
26 26.250 39.930 5.607 5.069 3.766 1.682 9.203 11.070 8.070 20.670 142.400 59.470
27 19.140 136.800 5.154 5.069 3.370 2.727 6.938 8.240 7.306 39.930 91.750 43.890
28 39.930 80.140 5.805 4.729 2.421 2.036 6.654 21.270 7.108 42.760 45.590 32.280
29 37.660 43.610 5.267 4.417 2.294 1.977 14.270 17.530 6.145 21.410 32.570 24.100
30 30.300 5.692 3.341 3.313 1.951 10.510 12.210 6.456 16.910 48.710 55.500
31 127.100 6.456 2.812 9.061 9.713 15.070 45.020
Average 30.920 29.320 16.590 14.770 3.911 3.343 14.000 6.744 11.600 21.080 45.900 33.760
Lowest 6.768 7.532 5.154 3.341 1.614 1.671 1.475 2.183 5.380 4.417 12.260 7.957
Highest 127.100 136.800 55.780 53.520 9.203 7.221 60.320 22.960 32.850 92.600 142.400 233.600
Monthly total
(million cu m) 82.81 73.46 44.45 38.28 10.48 8.66 37.51 18.06 30.06 56.47 119.00 90.43
Runoff (mm) 109 97 59 50 14 11 49 24 40 74 157 119
Rainfall (mm) 157 97 56 71 38 41 185 94 89 165 198 132
Statistics of monthly data for previous record (Oct 1955 to Dec 1959)
Mean Avg. 28.380 24.020 16.410 8.819 8.325 5.577 8.106 17.740 14.330 14.930 12.880 26.440
flows: Low 24.320 7.996 10.600 5.197 4.602 1.545 3.601 1.795 1.419 6.597 6.876 18.930
(year) 1956 1959 1959 1957 1959 1957 1959 1959 1959 1955 1958 1957
High 32.960 47.220 22.520 16.750 17.780 14.450 13.490 41.340 22.270 25.440 21.270 40.190
(year) 1958 1958 1957 1959 1958 1958 1958 1956 1956 1958 1959 1959
Runoff: Avg. 100 77 58 30 29 19 29 63 49 53 44 93
Low 86 25 37 18 16 5 13 6 5 23 23 67
High 116 151 79 57 63 49 48 146 76 90 73 142
Rainfall: Avg. 101 82 61 49 68 72 86 105 88 96 67 144
Low 77 20 46 10 25 46 35 18 8 61 33 112
High 123 178 86 104 122 112 124 226 135 132 142 203
Summary statistics Factors affecting runoff
1960
For 1960 For record As % of $ Reservoir(s) in catchment.
preceding 1960 pre-1960 $ Abstraction for public water supplies.
Mean flow 19.280 15.490 124 $ 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 3.343 Jun 1.419 Sep 1959 groundwater.
Highest monthly mean 45.900 Nov 47.220 Feb 1958
Lowest daily mean 1.475 3 Jul 0.425 23 Jun 1957
Highest daily mean 233.600 4 Dec 182.400 11 Feb 1958
10% exceedance 44.980 37.800 119
50% exceedance 10.350 8.350 124
95% exceedance 2.421 1.616 150
Annual total (million cu m) 609.70 488.80 125
Annual runoff (mm) 803 644 125
Annual rainfall (mm) 1323 1019 130
{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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