027002 Wharfe at Flint Mill Weir 1966
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 49.110 15.090 30.700 26.960 9.953 6.456 8.722 15.420 10.960 6.207 8.529 94.350
2 44.500 13.560 35.040 24.310 9.733 5.805 7.306 15.320 16.210 6.425 8.399 75.090
3 29.350 13.600 32.080 25.020 9.291 5.069 6.230 19.500 16.470 13.260 8.198 36.250
4 20.970 17.630 23.330 24.100 9.464 4.417 5.267 25.230 24.360 68.970 8.042 22.500
5 26.170 92.660 18.980 28.600 13.960 21.630 6.570 19.350 21.690 30.070 7.728 19.630
6 43.070 49.270 15.640 66.780 20.730 11.180 5.805 10.460 32.480 24.030 14.500 47.860
7 23.800 46.830 13.680 44.210 18.330 6.768 7.042 8.586 14.710 18.680 20.620 23.850
8 18.930 162.200 13.780 50.540 16.110 5.918 6.722 8.419 11.030 15.200 16.030 47.000
9 16.230 59.760 15.540 63.740 19.720 6.145 6.400 7.994 9.461 12.360 12.280 45.340
10 14.120 36.870 39.340 64.410 13.110 6.032 5.893 14.900 8.645 11.130 10.290 41.070
11 12.450 24.430 31.460 33.310 26.060 4.304 7.074 10.160 19.460 10.160 9.226 26.580
12 11.510 20.590 24.380 23.360 77.930 4.304 7.532 25.140 28.900 9.413 19.390 29.550
13 10.840 18.510 17.570 20.680 27.750 4.616 9.676 54.610 44.190 9.996 55.570 30.590
14 10.360 15.880 14.130 15.920 17.940 4.304 15.340 38.470 40.300 64.590 40.930 21.300
15 9.877 14.090 12.300 14.460 14.230 4.616 8.809 19.050 58.210 36.970 74.260 17.230
16 9.710 13.250 11.090 15.180 11.970 4.729 7.283 12.770 26.100 29.370 57.350 24.630
17 9.396 12.210 10.330 14.370 11.130 12.150 6.453 10.280 16.990 20.470 26.330 69.530
18 8.682 11.530 9.948 16.890 10.460 25.400 6.250 9.076 13.620 24.290 20.910 121.000
19 8.209 25.280 8.815 19.730 10.680 11.530 5.915 8.113 11.660 22.730 18.700 81.330
20 8.036 123.800 8.167 20.340 17.020 8.297 5.689 6.873 9.792 27.700 16.050 93.750
21 8.099 96.410 8.467 22.050 11.040 7.844 5.369 48.450 8.928 20.360 13.640 39.320
22 7.323 68.200 8.291 54.770 36.870 8.382 5.001 27.580 8.300 19.050 12.330 32.650
23 7.748 138.100 8.206 44.460 89.400 34.550 4.500 14.910 7.875 16.210 11.860 28.280
24 8.586 125.500 8.226 36.220 29.730 31.150 4.310 11.220 7.430 14.210 11.090 27.660
25 9.214 141.800 7.827 25.810 30.300 24.860 7.006 9.537 7.249 12.640 11.120 20.860
26 19.770 69.430 9.396 18.180 25.850 14.950 5.958 8.498 7.011 11.150 14.200 16.210
27 41.400 59.080 53.140 21.520 16.370 49.840 8.240 7.309 6.765 10.440 18.810 16.870
28 77.350 42.990 26.000 18.410 11.920 27.130 6.955 6.779 6.502 10.120 21.760 24.310
29 46.210 14.460 14.160 9.345 13.990 14.330 19.340 6.278 9.690 21.990 50.650
30 29.410 11.450 11.380 8.297 10.340 18.160 25.990 6.148 9.243 84.180 36.470
31 19.540 11.100 7.504 13.880 15.370 7.221 35.400
Average 21.290 54.590 17.830 29.330 20.720 12.890 7.732 17.250 16.920 19.430 22.480 41.840
Lowest 7.323 11.530 7.827 11.380 7.504 4.304 4.310 6.779 6.148 6.207 7.728 16.210
Highest 77.350 162.200 53.140 66.780 89.400 49.840 18.160 54.610 58.210 68.970 84.180 121.000
Monthly total
(million cu m) 57.02 132.10 47.77 76.02 55.49 33.41 20.71 46.20 43.87 52.04 58.26 112.10
Runoff (mm) 75 174 63 100 73 44 27 61 58 69 77 148
Rainfall (mm) 67 194 61 123 116 107 78 149 77 111 111 143
Statistics of monthly data for previous record (Oct 1955 to Dec 1965)
Mean Avg. 26.660 20.330 17.360 13.980 9.382 5.550 9.420 13.940 13.550 14.300 20.440 28.700
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 22.320 25.440 51.090 62.090
(year) 1961 1958 1963 1962 1958 1958 1963 1956 1965 1958 1963 1965
Runoff: Avg. 94 65 61 48 33 19 33 49 46 50 70 101
Low 16 9 24 18 14 5 13 6 5 23 23 36
High 139 151 128 76 63 49 58 146 76 90 174 219
Rainfall: Avg. 107 72 69 73 64 69 96 107 97 93 99 132
Low 41 20 28 10 25 33 35 18 8 46 33 41
High 165 178 127 130 122 140 185 226 184 165 211 224
Summary statistics Factors affecting runoff
1966
For 1966 For record As % of $ Reservoir(s) in catchment.
preceding 1966 pre-1966 $ Abstraction for public water supplies.
Mean flow 23.300 16.130 144 $ Flow reduced by industrial and/or
Lowest yearly mean 12.390 1964 agricultural abstractions.
Highest yearly mean 19.610 1965 $ Augmentation from surface water and/or
Lowest monthly mean 7.732 Jul 1.419 Sep 1959 groundwater.
Highest monthly mean 54.590 Feb 62.090 Dec 1965
Lowest daily mean 4.304 11 Jun 0.425 23 Jun 1957
Highest daily mean 162.200 8 Feb 233.600 4 Dec 1960
10% exceedance 49.530 39.000 127
50% exceedance 15.310 8.448 181
95% exceedance 5.933 2.192 271
Annual total (million cu m) 734.80 509.10 144
Annual runoff (mm) 968 671 144
Annual rainfall (mm) 1337 1078 124
{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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