027002 Wharfe at Flint Mill Weir 1985
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 12.690 55.030 5.995 42.270 5.973 6.561 3.357 10.050 23.040 6.751 4.599 21.340
2 10.630 30.960 5.983 28.110 5.509 5.917 3.145 9.691 22.390 6.346 4.396 31.110
3 9.327 21.780 7.063 24.110 5.156 5.496 3.007 19.120 52.440 9.288 3.973 31.210
4 8.652 19.710 18.390 35.750 4.986 5.163 2.886 46.030 38.250 12.570 3.972 17.770
5 8.130 15.330 13.550 38.710 5.275 4.903 2.688 124.400 23.960 8.790 9.781 15.060
6 8.010 12.820 9.603 25.160 5.455 4.663 2.555 35.310 15.940 34.850 13.610 21.540
7 7.882 11.550 8.955 36.000 5.505 4.857 3.004 20.210 12.410 43.190 24.450 35.810
8 7.343 10.660 8.461 39.580 5.084 5.110 2.942 15.500 34.620 36.850 27.390 32.660
9 6.994 9.154 7.195 25.920 4.737 5.068 2.608 15.160 18.370 49.730 75.200 18.300
10 6.874 7.988 6.547 21.120 4.557 5.036 2.554 10.480 12.860 27.090 48.780 14.000
11 6.552 7.619 6.132 87.740 4.376 4.765 2.585 18.810 10.150 31.480 20.320 14.130
12 6.024 7.372 5.771 56.630 4.247 36.820 5.899 46.250 8.882 16.720 12.680 15.580
13 6.093 7.039 5.721 51.040 4.243 14.610 19.400 20.700 7.670 12.290 9.735 55.840
14 5.900 6.697 5.433 49.320 12.270 8.784 9.530 22.670 7.161 10.070 8.967 30.440
15 5.652 6.369 5.195 27.540 35.680 6.819 5.953 38.730 8.017 8.816 9.640 26.380
16 5.261 6.052 5.140 19.600 16.530 5.581 4.441 50.150 17.400 7.969 12.560 20.860
17 5.172 5.784 4.990 15.600 9.995 4.960 4.518 22.080 28.340 7.288 17.450 17.050
18 4.655 5.455 4.761 12.940 7.932 4.424 5.952 15.030 13.820 6.650 11.590 24.830
19 4.280 5.241 4.711 11.390 7.139 4.485 5.744 18.510 15.110 6.195 9.727 21.730
20 4.328 5.205 4.643 10.060 6.684 4.164 9.104 34.180 11.830 5.745 8.708 44.330
21 17.160 5.339 4.529 9.207 6.531 4.340 10.400 28.270 59.590 5.469 7.949 165.700
22 40.690 5.501 5.341 8.669 5.989 5.654 9.361 17.420 78.780 5.474 7.542 93.410
23 26.810 6.520 15.200 7.891 5.614 8.949 12.790 14.250 33.110 5.207 8.220 42.270
24 17.800 11.330 17.590 7.375 8.103 9.562 6.836 54.110 26.820 5.123 13.210 30.240
25 12.140 8.160 12.400 6.881 14.830 6.474 5.922 48.130 16.070 4.886 11.210 25.470
26 10.260 7.679 10.750 6.517 20.260 5.166 31.560 31.110 12.630 4.582 9.378 21.730
27 9.127 7.070 8.583 6.261 14.630 4.520 47.950 18.330 11.980 4.299 7.912 16.480
28 16.480 6.107 7.199 6.167 22.760 4.243 21.800 28.840 9.483 4.173 6.979 12.970
29 71.630 15.450 6.403 12.640 3.818 32.900 17.920 7.971 4.256 6.367 10.660
30 67.830 40.790 6.324 9.260 3.593 25.750 12.890 7.235 4.009 6.470 10.160
31 71.000 18.510 7.538 14.450 11.080 4.324 18.460
Average 16.170 11.270 9.696 24.340 9.338 6.817 10.370 28.240 21.540 12.920 14.090 30.890
Lowest 4.280 5.205 4.529 6.167 4.243 3.593 2.554 9.691 7.161 4.009 3.972 10.160
Highest 71.630 55.030 40.790 87.740 35.680 36.820 47.950 124.400 78.780 49.730 75.200 165.700
Monthly total
(million cu m) 43.32 27.26 25.97 63.10 25.01 17.67 27.79 75.64 55.84 34.60 36.53 82.73
Runoff (mm) 57 36 34 83 33 23 37 100 74 46 48 109
Rainfall (mm) 89 14 74 108 90 58 123 173 96 65 90 148
Statistics of monthly data for previous record (Oct 1955 to Dec 1984)
Mean Avg. 27.930 23.580 21.440 15.190 11.320 7.544 7.565 11.180 13.630 18.320 24.020 27.190
flows: Low 4.472 2.974 6.741 4.496 2.312 1.545 1.674 0.991 1.419 3.026 6.876 10.230
(year) 1963 1963 1961 1974 1980 1957 1976 1976 1959 1972 1958 1963
High 44.000 54.590 53.940 35.240 26.750 18.530 16.440 41.340 33.520 54.000 51.090 62.090
(year) 1984 1966 1981 1970 1967 1972 1963 1956 1968 1967 1963 1965
Runoff: Avg. 99 76 76 52 40 26 27 39 47 65 82 96
Low 16 9 24 15 8 5 6 4 5 11 23 36
High 155 174 190 120 94 63 58 146 115 191 174 219
Rainfall: Avg. 114 83 89 72 77 76 82 97 107 107 114 121
Low 41 20 28 8 13 18 20 18 8 32 33 41
High 217 194 222 147 181 183 185 226 241 225 211 233
Summary statistics Factors affecting runoff
1985
For 1985 For record As % of $ Reservoir(s) in catchment.
preceding 1985 pre-1985 $ Abstraction for public water supplies.
Mean flow 16.340 17.390 94 $ Flow reduced by industrial and/or
Lowest yearly mean 11.420 1975 agricultural abstractions.
Highest yearly mean 23.300 1966 $ Augmentation from surface water and/or
Lowest monthly mean 6.817 Jun 0.991 Aug 1976 groundwater.
Highest monthly mean 30.890 Dec 62.090 Dec 1965
Lowest daily mean 2.554 10 Jul 0.425 23 Jun 1957
Highest daily mean 165.700 21 Dec 288.400 3 Jan 1982
10% exceedance 36.380 41.500 88
50% exceedance 9.542 9.675 99
95% exceedance 4.206 2.233 188
Annual total (million cu m) 515.30 548.80 94
Annual runoff (mm) 679 723 94
Annual rainfall (mm) 1128 1139 99
{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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