027002 Wharfe at Flint Mill Weir 1955
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 1.523 4.049 3.568
2 1.048 3.879 3.568
3 2.138 4.021 2.747
4 1.665 14.810 5.437
5 1.826 12.460 5.295
6 7.306 7.957 4.163
7 8.892 9.854 37.380
8 4.021 18.830 18.350
9 3.710 14.330 34.550
10 4.672 22.740 98.540
11 3.228 45.590 33.980
12 2.784 22.090 17.330
13 2.775 13.280 11.240
14 2.288 9.373 21.320
15 1.665 7.872 35.400
16 5.012 6.570 28.290
17 4.672 6.003 24.070
18 4.984 5.267 14.410
19 23.650 3.879 10.340
20 26.420 4.163 9.345
21 13.420 5.125 8.127
22 7.306 4.021 7.249
23 5.720 3.879 43.610
24 5.720 4.021 80.990
25 4.021 4.021 27.240
26 11.580 3.087 26.510
27 17.530 2.747 67.680
28 8.467 4.333 89.200
29 6.145 3.426 40.490
30 5.154 3.710 22.510
31 5.154 16.110
Average 6.597 9.180 27.390
Lowest 1.048 2.747 2.747
Highest 26.420 45.590 98.540
Monthly total
(million cu m) 17.67 23.79 73.36
Runoff (mm) 23 31 97
Rainfall (mm) 77 72 65 43 108 78 35 38 68 74 64 155
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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