027002 Wharfe at Flint Mill Weir 1965
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 32.280 8.382 6.711 9.373 9.515 5.493 5.040 9.401 8.070 92.030 133.400 12.830
2 16.990 8.297 5.777 8.608 8.184 5.409 4.729 18.290 5.975 50.400 69.660 33.980
3 11.920 6.768 5.493 7.759 7.929 4.871 3.200 33.980 5.833 29.730 28.010 173.000
4 9.515 6.343 5.890 7.419 7.844 4.757 3.625 22.230 6.371 22.090 18.100 75.320
5 8.693 6.570 6.116 7.532 9.090 3.172 4.587 37.100 7.589 17.760 14.220 60.600
6 8.382 13.560 4.134 6.456 7.900 4.333 3.908 21.460 7.306 14.410 11.130 84.390
7 11.840 10.530 4.701 7.589 12.120 5.097 3.879 16.680 13.250 12.600 10.050 45.870
8 60.600 9.033 6.570 6.909 23.560 5.097 3.879 11.440 10.220 11.180 10.310 43.890
9 39.360 8.070 7.900 7.108 32.850 6.230 3.370 9.118 11.920 9.798 9.684 227.100
10 70.790 7.108 7.759 51.540 20.730 4.672 2.019 7.900 35.680 9.260 8.637 152.100
11 108.500 6.230 7.249 23.620 13.650 4.531 2.801 6.230 20.390 8.269 8.665 59.180
12 35.680 6.456 6.173 25.660 9.345 2.690 4.417 5.210 13.310 7.136 14.220 41.340
13 37.380 5.692 5.550 24.890 8.099 3.370 10.510 5.040 10.790 7.221 11.330 52.950
14 71.640 6.343 6.570 15.570 7.362 4.984 18.460 4.644 8.580 6.966 9.260 47.290
15 41.340 6.230 8.778 26.620 6.230 4.078 9.968 5.154 7.362 6.768 8.467 43.330
16 87.780 5.607 20.980 19.680 6.230 4.219 6.683 5.493 39.080 6.485 8.184 57.200
17 82.400 5.692 11.470 32.570 7.447 4.417 4.333 6.032 22.510 5.692 12.860 49.270
18 63.430 5.607 8.269 29.170 7.872 4.616 4.389 5.040 52.100 6.485 30.870 151.800
19 32.000 5.918 8.693 23.080 12.350 8.495 4.984 4.163 19.000 5.777 28.600 52.950
20 21.830 7.646 9.571 17.220 8.608 6.032 3.115 3.964 12.350 5.522 36.250 33.700
21 15.720 6.570 11.810 13.820 7.589 6.286 3.087 8.665 9.571 6.371 24.440 25.490
22 15.120 7.589 12.740 11.380 5.692 9.769 3.002 12.940 8.495 6.286 15.940 24.980
23 13.110 7.985 45.310 10.080 5.692 11.270 2.645 7.306 7.759 4.446 19.510 92.880
24 57.200 7.929 50.400 8.665 6.796 15.400 4.502 6.116 8.325 4.389 28.880 55.500
25 25.400 7.249 38.790 7.759 6.966 22.260 4.757 18.040 19.540 5.635 66.830 37.950
26 17.760 6.626 49.840 8.127 7.306 16.880 7.759 13.200 111.600 5.069 34.550 25.800
27 16.030 5.097 62.300 10.420 7.023 9.430 7.108 10.650 39.080 4.729 22.710 19.770
28 13.880 5.409 35.400 11.640 6.116 7.306 15.240 7.164 25.490 4.927 17.220 15.380
29 12.350 20.130 20.050 4.842 6.230 71.360 10.190 52.390 5.154 17.420 16.170
30 10.140 14.560 12.460 5.097 5.493 28.260 7.362 69.660 30.300 14.920 60.880
31 9.033 11.240 5.890 12.230 6.513 48.990 51.820
Average 34.130 7.162 16.350 15.760 9.546 6.896 8.640 11.180 22.320 14.900 24.810 62.090
Lowest 8.382 5.097 4.134 6.456 4.842 2.690 2.019 3.964 5.833 4.389 8.184 12.830
Highest 108.500 13.560 62.300 51.540 32.850 22.260 71.360 37.100 111.600 92.030 133.400 227.100
Monthly total
(million cu m) 91.42 17.33 43.79 40.85 25.57 17.88 23.14 29.96 57.85 39.91 64.31 166.30
Runoff (mm) 120 23 58 54 34 24 30 39 76 53 85 219
Rainfall (mm) 136 28 86 90 64 67 101 97 184 68 146 224
Statistics of monthly data for previous record (Oct 1955 to Dec 1964)
Mean Avg. 25.830 21.790 17.470 13.780 9.364 5.400 9.506 14.250 12.570 14.240 20.000 25.370
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. 91 70 62 47 33 18 34 50 43 50 68 90
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. 104 77 67 71 64 70 95 108 88 96 94 123
Low 41 20 28 10 25 33 35 18 8 46 33 41
High 165 178 127 130 122 140 185 226 135 165 211 203
Summary statistics Factors affecting runoff
1965
For 1965 For record As % of $ Reservoir(s) in catchment.
preceding 1965 pre-1965 $ Abstraction for public water supplies.
Mean flow 19.610 15.780 124 $ Flow reduced by industrial and/or
Lowest yearly mean 12.390 1964 agricultural abstractions.
Highest yearly mean 19.290 1958 $ Augmentation from surface water and/or
Lowest monthly mean 6.896 Jun 1.419 Sep 1959 groundwater.
Highest monthly mean 62.090 Dec 51.090 Nov 1963
Lowest daily mean 2.019 10 Jul 0.425 23 Jun 1957
Highest daily mean 227.100 9 Dec 233.600 4 Dec 1960
10% exceedance 50.100 38.470 130
50% exceedance 9.303 8.334 112
95% exceedance 4.157 2.150 193
Annual total (million cu m) 618.40 498.00 124
Annual runoff (mm) 815 656 124
Annual rainfall (mm) 1291 1057 122
{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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