027002 Wharfe at Flint Mill Weir 1958
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 52.390 14.100 64.280 13.930 4.389 6.598 25.880 8.297 5.777 51.250 4.389 5.465
2 22.820 23.960 36.250 10.310 4.134 7.617 68.240 12.630 3.964 49.840 8.637 3.908
3 15.890 24.440 25.260 8.523 2.832 12.060 38.230 25.320 4.644 42.190 9.288 3.908
4 12.520 25.400 25.200 8.835 3.115 11.330 52.950 24.010 4.134 124.600 6.881 4.134
5 114.400 102.200 33.130 8.042 4.502 7.900 30.870 25.490 3.483 79.000 6.003 4.248
6 79.000 34.260 25.850 8.976 3.794 6.626 19.000 17.100 3.483 42.480 5.380 3.426
7 65.700 19.110 15.910 9.515 4.644 6.768 13.990 10.700 3.710 54.090 4.899 3.200
8 38.510 17.080 13.170 8.184 5.097 22.310 11.020 9.316 5.097 43.610 4.389 4.757
9 87.780 17.220 11.470 7.561 12.040 12.660 8.552 8.297 14.440 36.250 5.380 8.807
10 45.590 60.880 10.420 6.456 27.160 8.722 7.334 26.050 7.731 20.190 6.116 7.957
11 51.540 182.400 9.288 5.890 44.180 8.552 6.201 22.030 5.890 16.820 5.380 10.590
12 27.100 145.500 8.297 4.219 53.800 23.730 5.663 14.470 4.191 14.750 5.380 42.190
13 16.080 56.630 8.722 4.955 32.280 21.210 6.315 11.920 3.200 39.360 27.380 43.040
14 12.940 125.200 8.835 5.635 36.250 11.580 10.020 33.410 2.973 25.830 12.520 21.290
15 16.060 124.600 7.447 4.389 65.130 8.835 7.306 15.320 6.400 14.950 8.976 13.960
16 12.180 81.270 7.476 4.502 37.950 7.334 6.343 19.340 9.175 17.670 7.957 18.720
17 11.360 39.080 7.900 4.531 22.430 6.485 7.900 14.530 8.070 14.750 7.759 36.250
18 15.940 24.470 7.051 4.502 15.120 6.060 7.447 9.260 6.768 10.590 6.768 54.090
19 24.380 19.000 6.060 3.823 10.450 6.201 4.474 8.552 14.330 9.713 6.315 78.440
20 12.880 16.680 6.145 4.814 9.571 10.140 4.644 22.770 43.040 9.571 6.201 45.310
21 10.170 15.660 6.060 5.918 10.250 14.580 5.493 18.920 27.410 8.863 5.663 23.220
22 8.835 15.690 5.352 5.522 10.170 29.170 4.219 17.050 23.140 8.750 4.757 16.740
23 7.589 15.070 5.522 4.531 21.070 72.210 4.248 19.310 18.290 7.957 4.899 13.710
24 6.909 16.420 6.201 4.389 28.600 23.650 4.106 11.470 64.850 6.881 6.654 11.380
25 8.750 15.350 5.295 4.248 25.940 13.850 3.681 9.769 64.280 5.663 5.663 10.360
26 12.630 12.910 5.465 17.440 15.040 13.930 2.860 8.835 28.880 5.578 5.012 9.826
27 47.290 20.330 6.088 11.330 10.280 16.820 3.540 7.731 17.050 6.768 5.267 17.190
28 85.800 57.200 10.170 7.589 8.269 15.940 11.500 6.456 11.870 4.786 4.757 25.660
29 54.650 41.060 6.060 7.306 11.440 15.210 7.419 32.850 5.465 3.710 25.000
30 26.510 34.260 5.182 8.014 9.118 8.580 5.493 39.640 5.267 3.908 41.340
31 17.440 19.990 7.476 12.490 5.125 5.012 53.520
Average 32.960 47.220 15.600 6.993 17.780 14.450 13.490 14.720 16.290 25.440 6.876 21.340
Lowest 6.909 12.910 5.295 3.823 2.832 6.060 2.860 5.125 2.973 4.786 3.710 3.200
Highest 114.400 182.400 64.280 17.440 65.130 72.210 68.240 33.410 64.850 124.600 27.380 78.440
Monthly total
(million cu m) 88.27 114.20 41.79 18.13 47.63 37.45 36.14 39.43 42.23 68.13 17.82 57.17
Runoff (mm) 116 151 55 24 63 49 48 52 56 90 23 75
Rainfall (mm) 104 178 48 28 122 112 99 94 119 99 36 132
Statistics of monthly data for previous record (Oct 1955 to Dec 1957)
Mean Avg. 26.190 20.440 19.720 5.766 5.457 2.680 7.664 27.220 19.810 13.060 12.080 23.550
flows: Low 24.320 13.240 16.920 5.197 4.705 1.545 7.128 13.110 17.350 6.597 7.409 18.930
(year) 1956 1956 1956 1957 1957 1957 1957 1957 1957 1955 1956 1957
High 28.060 27.640 22.520 6.335 6.208 3.816 8.200 41.340 22.270 21.530 19.660 27.390
(year) 1957 1957 1957 1956 1956 1956 1956 1956 1956 1957 1957 1955
Runoff: Avg. 92 66 70 20 19 9 27 96 68 46 41 83
Low 86 44 60 18 17 5 25 46 59 23 25 67
High 99 88 79 22 22 13 29 146 76 76 67 97
Rainfall: Avg. 101 71 66 37 64 67 86 138 105 89 52 128
Low 77 51 46 10 41 46 35 38 68 61 33 112
High 123 91 86 58 108 78 124 226 135 132 64 155
Summary statistics Factors affecting runoff
1958
For 1958 For record As % of $ Reservoir(s) in catchment.
preceding 1958 pre-1958 $ Abstraction for public water supplies.
Mean flow 19.290 15.320 126 $ Flow reduced by industrial and/or
Lowest yearly mean 15.530 1956 agricultural abstractions.
Highest yearly mean 15.570 1957 $ Augmentation from surface water and/or
Lowest monthly mean 6.876 Nov 1.545 Jun 1957 groundwater.
Highest monthly mean 47.220 Feb 41.340 Aug 1956
Lowest daily mean 2.832 3 May 0.425 23 Jun 1957
Highest daily mean 182.400 11 Feb 144.100 30 Oct 1957
10% exceedance 44.700 35.980 124
50% exceedance 10.390 8.501 122
95% exceedance 3.962 2.056 193
Annual total (million cu m) 608.30 483.60 126
Annual runoff (mm) 802 637 126
Annual rainfall (mm) 1171 1004 117
{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.
In line with Natural Environment Research Council policy, the provision of data from the National River Flow Archive confers only a right to use the data. Ownership of the data, or the associated Intellectual Property Rights, will not normally be transferred. Data received from the NRFA must not be sold, or passed on to any third party. Reproduction is authorised, except for commercial purposes, provided the sources is acknowledged.
Through the use of quality control procedures every effort is made to maintain and improve the quality of data. However, NERC, the Environment Agency, the Scottish Environment Protection Agency and the Rivers Agency accepts no liability for any loss or damage, cost or claims arising directly or indirectly their use.