027002 Wharfe at Flint Mill Weir 1967
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 27.990 37.320 47.320 9.506 6.071 14.160 6.626 13.320 8.240 31.180 33.290 11.640
2 21.600 44.780 45.730 25.230 6.544 13.130 5.924 8.906 13.970 92.560 43.600 9.948
3 16.480 32.420 31.680 23.210 6.595 10.290 6.213 7.150 33.960 100.400 28.060 9.158
4 13.960 21.830 22.860 14.540 22.420 9.180 6.510 32.940 38.330 83.710 24.900 9.350
5 12.600 16.450 18.420 10.970 16.800 9.172 5.893 27.920 88.980 32.480 112.500 10.340
6 11.230 13.820 15.880 9.362 34.660 11.470 5.392 13.150 62.860 21.060 63.270 12.370
7 10.690 12.330 13.570 8.948 29.370 11.320 5.309 10.920 30.760 54.880 34.040 10.150
8 10.120 11.260 12.640 14.280 25.340 9.786 4.553 10.090 19.960 75.200 26.750 8.475
9 9.464 10.400 23.250 27.880 23.630 8.730 4.086 66.330 15.440 148.700 26.560 7.614
10 9.277 9.871 38.820 16.330 15.310 7.456 4.284 41.960 13.050 68.470 24.040 7.266
11 9.713 9.132 31.920 11.630 12.740 6.924 4.466 30.590 11.530 35.130 47.300 7.841
12 9.934 8.976 32.560 10.400 26.640 7.130 4.474 28.900 10.250 25.950 32.940 9.135
13 10.050 8.761 23.190 9.373 25.200 6.969 4.449 24.250 9.285 27.160 21.680 9.560
14 9.837 8.399 22.390 8.741 28.990 6.796 14.480 65.090 8.569 55.180 19.260 9.093
15 9.512 8.051 21.860 8.303 90.230 6.635 11.150 47.410 7.654 66.330 17.300 9.090
16 9.090 9.008 18.590 8.107 33.840 6.349 7.742 24.910 6.295 101.400 16.810 20.700
17 8.617 20.430 18.040 7.796 24.290 5.380 6.708 26.080 6.657 214.600 14.140 11.440
18 8.863 20.710 17.230 7.416 18.640 4.848 10.680 137.100 6.734 57.070 12.490 9.229
19 18.440 34.030 12.480 7.133 22.530 5.233 9.132 97.130 7.025 49.480 10.670 8.288
20 16.180 35.780 10.790 7.088 28.300 5.547 7.849 37.420 6.870 35.900 10.200 7.677
21 30.010 25.090 10.420 7.326 23.840 5.760 6.417 21.540 6.677 26.890 10.410 7.790
22 29.780 37.670 9.812 7.068 37.620 6.148 5.046 16.260 6.060 20.690 10.240 16.350
23 45.070 104.500 10.070 6.892 24.570 7.985 4.497 13.260 5.230 16.970 9.849 111.900
24 36.270 34.320 13.130 7.832 33.240 8.390 4.460 11.690 4.998 25.710 9.367 47.790
25 41.700 25.790 10.410 14.620 39.650 37.690 4.369 11.590 6.060 22.650 9.359 38.070
26 38.730 32.970 22.110 10.140 25.830 29.270 4.890 8.543 29.000 23.250 11.990 24.650
27 26.600 80.990 16.170 8.371 27.720 13.960 5.278 7.699 25.170 40.200 9.172 23.660
28 28.920 130.500 13.680 7.702 49.280 9.384 8.455 7.779 12.110 51.220 21.580 30.460
29 21.030 12.140 6.578 30.870 8.809 5.714 7.759 11.000 26.200 20.110 20.120
30 25.080 11.740 6.179 21.460 8.495 25.580 7.272 61.740 19.030 13.950 16.310
31 24.310 11.820 17.060 44.730 7.631 24.330 18.720
Average 19.390 30.200 20.020 10.970 26.750 10.080 8.237 28.150 19.150 54.000 24.860 17.880
Lowest 8.617 8.051 9.812 6.179 6.071 4.848 4.086 7.150 4.998 16.970 9.172 7.266
Highest 45.070 130.500 47.320 27.880 90.230 37.690 44.730 137.100 88.980 214.600 112.500 111.900
Monthly total
(million cu m) 51.94 73.06 53.63 28.42 71.65 26.13 22.06 75.39 49.63 144.60 64.44 47.88
Runoff (mm) 68 96 71 37 94 34 29 99 65 191 85 63
Rainfall (mm) 68 114 72 52 181 65 90 183 125 225 89 72
Statistics of monthly data for previous record (Oct 1955 to Dec 1966)
Mean Avg. 26.170 23.440 17.400 15.370 10.410 6.217 9.266 14.240 13.850 14.730 20.610 29.800
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 54.590 36.400 29.330 20.720 14.450 16.440 41.340 22.320 25.440 51.090 62.090
(year) 1961 1966 1963 1966 1966 1958 1963 1956 1965 1958 1963 1965
Runoff: Avg. 92 75 61 53 37 21 33 50 47 52 70 105
Low 16 9 24 18 14 5 13 6 5 23 23 36
High 139 174 128 100 73 49 58 146 76 90 174 219
Rainfall: Avg. 104 83 68 77 69 73 94 110 95 95 100 133
Low 41 20 28 10 25 33 35 18 8 46 33 41
High 165 194 127 130 122 140 185 226 184 165 211 224
Summary statistics Factors affecting runoff
1967
For 1967 For record As % of $ Reservoir(s) in catchment.
preceding 1967 pre-1967 $ Abstraction for public water supplies.
Mean flow 22.480 16.770 134 $ 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 8.237 Jul 1.419 Sep 1959 groundwater.
Highest monthly mean 54.000 Oct 62.090 Dec 1965
Lowest daily mean 4.086 9 Jul 0.425 23 Jun 1957
Highest daily mean 214.600 17 Oct 233.600 4 Dec 1960
10% exceedance 44.080 40.200 110
50% exceedance 13.810 8.972 154
95% exceedance 5.474 2.287 239
Annual total (million cu m) 708.90 529.20 134
Annual runoff (mm) 934 697 134
Annual rainfall (mm) 1336 1101 121
{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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