027002 Wharfe at Flint Mill Weir 1972
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 11.460 12.360 20.030 43.680 7.915 33.210 9.203 6.463 2.906 2.012 4.904 92.770
2 10.860 13.510 24.970 79.330 7.236 19.130 8.167 6.449 2.838 2.166 3.967 45.500
3 11.750 48.560 24.060 46.660 6.859 37.080 7.901 5.473 2.609 1.699 5.583 42.220
4 10.520 58.790 27.200 27.660 14.340 20.830 19.790 6.121 2.931 1.699 8.758 56.080
5 9.596 33.630 21.490 43.910 9.961 27.570 28.440 7.290 2.991 1.472 9.259 95.120
6 8.804 38.280 21.390 48.140 8.993 17.210 13.960 24.580 2.922 1.842 8.436 75.280
7 8.402 27.560 27.000 39.860 13.630 14.660 10.320 20.810 2.922 1.666 7.383 63.570
8 11.420 22.300 26.490 35.370 11.030 14.520 9.636 24.190 3.268 1.695 8.611 40.590
9 28.900 29.000 22.180 26.460 14.100 13.020 8.591 12.960 8.023 2.132 35.240 25.820
10 30.930 23.780 17.990 43.490 13.950 26.060 7.711 9.146 7.468 3.968 69.990 25.740
11 64.540 31.270 14.730 60.700 10.930 19.120 7.134 7.499 5.125 6.605 26.110 33.250
12 43.040 21.170 12.290 34.390 34.990 17.620 8.048 6.627 4.131 4.097 44.120 70.050
13 51.340 19.350 11.070 22.600 29.840 19.300 6.520 5.832 4.069 3.407 41.210 51.700
14 34.730 17.410 10.160 17.120 16.240 13.500 5.739 5.065 3.707 3.096 28.950 29.710
15 23.060 25.430 9.913 13.750 11.570 11.190 5.227 4.661 3.512 2.563 16.770 21.670
16 20.250 68.100 9.755 11.980 9.505 9.571 4.946 4.709 3.146 2.640 14.010 17.440
17 21.600 37.850 9.104 10.600 8.458 8.572 4.629 7.046 3.056 2.251 11.940 14.890
18 20.390 25.640 8.552 9.559 7.912 26.640 4.437 5.108 3.113 2.250 9.658 13.160
19 68.570 18.360 8.342 8.620 7.315 18.250 4.126 4.564 2.728 2.218 10.760 11.670
20 31.410 15.030 7.972 7.986 7.075 15.290 4.004 4.295 2.870 2.254 54.140 10.590
21 21.660 13.330 7.564 7.570 6.899 27.360 3.942 4.021 2.708 2.416 73.970 9.282
22 29.260 12.450 7.193 7.278 6.823 18.760 4.593 3.913 2.754 2.606 38.660 8.685
23 30.200 12.220 6.944 7.055 6.551 14.800 4.511 3.775 2.802 2.759 19.900 8.246
24 45.780 11.150 6.755 6.806 6.251 12.100 7.972 3.562 2.544 2.374 14.050 7.989
25 25.090 10.250 6.667 6.409 6.876 13.730 10.370 3.345 2.865 2.523 11.620 7.686
26 50.420 11.420 7.598 6.282 32.610 26.310 6.596 3.212 2.575 2.551 10.770 7.522
27 48.220 11.070 11.290 6.132 51.340 18.550 5.289 3.393 2.575 2.606 10.080 7.400
28 28.940 10.180 12.720 5.920 20.810 18.930 4.485 3.214 2.691 3.107 14.120 7.377
29 19.750 9.220 14.030 9.081 16.210 12.350 4.236 2.931 2.572 3.345 26.330 7.417
30 16.140 68.770 10.210 39.770 10.520 4.061 3.076 2.689 10.690 50.340 6.913
31 13.430 50.510 55.750 4.462 2.906 7.083 6.743
Average 27.430 23.750 17.250 23.490 16.190 18.530 7.711 6.975 3.370 3.026 22.990 29.740
Lowest 8.402 9.220 6.667 5.920 6.251 8.572 3.942 2.906 2.544 1.472 3.967 6.743
Highest 68.570 68.100 68.770 79.330 55.750 37.080 28.440 24.580 8.023 10.690 73.970 95.120
Monthly total
(million cu m) 73.48 59.50 46.20 60.88 43.35 48.02 20.65 18.68 8.74 8.10 59.58 79.67
Runoff (mm) 97 78 61 80 57 63 27 25 12 11 79 105
Rainfall (mm) 133 87 95 83 124 109 72 50 37 34 144 109
Statistics of monthly data for previous record (Oct 1955 to Dec 1971)
Mean Avg. 25.300 23.300 18.850 16.910 12.110 7.139 9.153 13.850 14.540 17.920 23.050 26.090
flows: Low 4.472 2.974 6.741 5.197 3.911 1.545 3.601 1.795 1.419 6.209 6.876 10.230
(year) 1963 1963 1961 1957 1960 1957 1959 1959 1959 1969 1958 1963
High 39.260 54.590 36.400 35.240 26.750 14.540 16.440 41.340 33.520 54.000 51.090 62.090
(year) 1961 1966 1963 1970 1967 1969 1963 1956 1968 1967 1963 1965
Runoff: Avg. 89 75 67 58 43 24 32 49 50 63 79 92
Low 16 9 24 18 14 5 13 6 5 22 23 36
High 139 174 128 120 94 50 58 146 115 191 174 219
Rainfall: Avg. 101 84 77 80 77 75 93 105 100 105 108 114
Low 41 20 28 10 13 33 35 18 8 38 33 41
High 165 194 148 147 181 140 185 226 241 225 211 224
Summary statistics Factors affecting runoff
1972
For 1972 For record As % of $ Reservoir(s) in catchment.
preceding 1972 pre-1972 $ Abstraction for public water supplies.
Mean flow 16.660 17.330 96 $ Flow reduced by industrial and/or
Lowest yearly mean 12.390 1964 agricultural abstractions.
Highest yearly mean 23.300 1966 $ Augmentation from surface water and/or
Lowest monthly mean 3.026 Oct 1.419 Sep 1959 groundwater.
Highest monthly mean 29.740 Dec 62.090 Dec 1965
Lowest daily mean 1.472 5 Oct 0.425 23 Jun 1957
Highest daily mean 95.120 5 Dec 233.600 4 Dec 1960
10% exceedance 40.330 39.760 101
50% exceedance 10.270 9.609 107
95% exceedance 2.551 2.591 98
Annual total (million cu m) 526.80 546.90 96
Annual runoff (mm) 694 721 96
Annual rainfall (mm) 1077 1119 96
{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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