027002 Wharfe at Flint Mill Weir 1956
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 18.380 19.710 67.960 4.163 5.267 3.426 1.835 49.270 13.420 10.590 8.722 7.815
2 19.260 15.180 131.400 4.163 4.955 2.138 3.115 88.920 14.530 9.345 7.646 11.550
3 12.710 11.980 38.510 3.879 4.814 1.996 3.115 27.780 62.580 8.212 6.428 14.040
4 11.470 11.550 27.640 5.097 4.531 3.879 6.570 20.670 23.420 8.665 6.145 10.140
5 10.340 16.570 31.720 4.021 4.842 2.917 31.150 15.940 20.080 18.800 6.711 66.550
6 9.231 18.800 26.790 4.049 3.738 3.851 14.920 11.840 73.910 11.160 5.409 36.530
7 8.070 13.900 27.070 2.784 3.710 4.191 8.410 10.560 101.100 8.523 5.522 16.710
8 7.929 11.380 18.350 3.256 6.116 4.163 8.523 8.410 74.760 7.929 5.239 13.650
9 7.561 9.968 13.820 4.531 7.277 2.888 6.994 6.994 30.300 6.853 5.380 12.400
10 6.711 8.948 11.040 3.993 24.070 2.747 4.955 6.145 19.820 6.570 5.239 11.920
11 8.014 8.070 9.599 10.390 10.990 3.879 4.333 15.010 16.370 5.833 7.079 13.620
12 9.373 7.815 8.637 8.835 19.480 5.380 3.568 17.560 18.580 5.692 7.532 29.450
13 8.835 9.090 7.674 10.480 10.280 6.145 3.426 26.450 17.810 4.672 6.145 30.300
14 16.790 8.552 7.532 13.930 7.731 4.474 3.058 28.030 16.310 4.871 5.833 48.990
15 17.560 7.532 6.966 9.203 7.561 3.738 15.940 15.350 13.170 5.720 7.249 39.080
16 24.720 6.966 6.683 8.297 6.258 2.302 11.920 92.880 10.620 4.446 6.428 24.350
17 53.800 6.570 5.862 6.428 6.116 4.021 7.872 122.600 9.345 4.955 5.097 18.750
18 32.570 5.720 6.003 5.692 5.097 7.929 5.720 90.050 8.155 7.646 5.154 18.100
19 16.480 6.003 6.711 5.239 4.021 7.051 5.409 74.190 7.277 6.711 6.145 14.300
20 49.270 5.833 5.833 4.757 4.163 8.552 4.955 41.060 6.570 56.350 4.955 11.840
21 56.920 5.663 6.116 3.540 4.163 5.437 2.917 26.190 6.145 20.670 4.814 10.340
22 75.040 5.522 6.683 3.596 4.163 3.879 2.747 16.740 5.975 11.890 4.474 9.939
23 28.320 5.097 6.286 4.814 4.531 2.444 3.596 12.740 6.570 16.230 4.304 18.040
24 20.190 5.692 5.097 3.568 3.596 2.161 2.917 45.310 6.570 16.710 3.540 20.420
25 15.570 4.474 5.295 3.426 4.049 3.256 3.398 101.900 5.522 14.440 3.738 14.330
26 15.570 5.012 6.145 12.540 3.879 2.302 3.087 85.520 5.550 12.120 6.881 11.720
27 33.410 6.428 4.955 13.250 3.256 2.458 2.761 71.360 5.692 8.863 25.970 10.340
28 33.700 26.080 4.814 9.401 3.058 2.458 13.760 78.160 29.170 7.929 23.390 15.520
29 58.050 109.900 5.097 6.428 3.256 2.600 27.350 35.400 24.920 11.470 12.260 54.940
30 39.930 4.616 6.286 3.879 1.821 22.290 22.030 13.900 9.118 8.835 81.840
31 28.260 3.568 3.596 13.590 16.370 9.769 56.630
Average 24.320 13.240 16.920 6.335 6.208 3.816 8.200 41.340 22.270 11.060 7.409 24.330
Lowest 6.711 4.474 3.568 2.784 3.058 1.821 1.835 6.145 5.522 4.446 3.540 7.815
Highest 75.040 109.900 131.400 13.930 24.070 8.552 31.150 122.600 101.100 56.350 25.970 81.840
Monthly total
(million cu m) 65.15 33.18 45.31 16.42 16.63 9.89 21.96 110.70 57.73 29.61 19.20 65.16
Runoff (mm) 86 44 60 22 22 13 29 146 76 39 25 86
Rainfall (mm) 123 51 46 58 41 76 124 226 112 61 33 117
Statistics of monthly data for previous record (Oct 1955 to Dec 1955)
Mean Avg. 6.597 9.180 27.390
flows: Low 6.597 9.180 27.390
(year) 1955 1955 1955
High 6.597 9.180 27.390
(year) 1955 1955 1955
Runoff: Avg. 23 31 97
Low 23 31 97
High 23 31 97
Rainfall: Avg. 77 72 65 43 108 78 35 38 68 74 64 155
Low 77 72 65 43 108 78 35 38 68 74 64 155
High 77 72 65 43 108 78 35 38 68 74 64 155
Summary statistics Factors affecting runoff
1956
For 1956 For record As % of $ Reservoir(s) in catchment.
preceding 1956 pre-1956 $ Abstraction for public water supplies.
Mean flow 15.530 $ Flow reduced by industrial and/or
Lowest yearly mean agricultural abstractions.
Highest yearly mean $ Augmentation from surface water and/or
Lowest monthly mean 3.816 Jun 6.597 Oct 1955 groundwater.
Highest monthly mean 41.340 Aug 27.390 Dec 1955
Lowest daily mean 1.821 30 Jun 1.048 2 Oct 1955
Highest daily mean 131.400 2 Mar 98.540 10 Dec 1955
10% exceedance 33.500
50% exceedance 7.936
95% exceedance 2.997
Annual total (million cu m) 491.10
Annual runoff (mm) 647
Annual rainfall (mm) 1068 877 122
{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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