027035 Aire at Kildwick Bridge 2001
Measuring authority: EA Grid reference: 44 (SE) 013 457 Catchment area (sq km): 282.3
First year: 1968 Level stn. (m OD): 87.30 Max alt. (m OD): 593
Daily mean gauged discharges (cubic metres per second)
DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1 16.880 4.866 3.649 3.055 3.724 1.410 1.084 0.558 0.873 17.840 4.013 13.260
2 31.670 8.807 3.360 2.998 3.169 1.306 1.058 0.550 0.844 9.332 3.422 9.022
3 18.090 21.460 3.057 5.090 2.832 1.201 0.991 0.617 0.838 10.590 3.108 8.270
4 14.900 15.600 2.756 22.520 2.608 1.164 0.901 0.614 0.771 13.940 3.070 14.860
5 9.421 29.320 2.587 21.940 2.393 1.114 0.866 0.606 0.811 12.940 3.024 27.420
6 9.180 45.610 4.918 28.760 2.181 2.538 0.857 0.818 0.790 14.790 3.618 13.690
7 14.350 43.840 17.740 33.010 2.033 2.814 0.820 3.251 0.765 21.050 6.279 14.810
8 12.140 21.070 8.237 14.490 1.928 1.801 1.003 3.503 0.772 50.370 6.459 10.320
9 8.304 11.870 7.164 11.480 1.842 1.590 0.873 1.690 0.720 33.710 4.148 7.564
10 6.631 25.830 6.931 10.360 1.736 1.542 1.021 1.193 0.690 22.850 3.582 6.144
11 5.486 62.470 6.458 7.132 1.649 1.362 2.089 1.380 0.681 13.440 3.477 5.162
12 4.857 45.930 8.212 5.792 1.578 1.282 2.299 10.460 1.103 8.708 5.144 4.591
13 4.300 23.710 5.801 4.731 1.566 1.247 1.266 10.730 6.467 6.447 4.059 4.089
14 3.905 21.540 4.524 4.372 2.357 1.894 1.014 4.484 3.581 5.381 3.291 3.643
15 3.657 14.130 3.845 4.265 2.586 9.451 0.969 3.086 2.581 5.928 2.938 3.352
16 3.359 8.680 3.358 3.600 2.172 4.598 0.911 3.850 1.856 5.052 2.676 3.180
17 3.069 6.610 3.020 3.543 2.213 2.542 0.859 2.806 1.521 4.207 2.534 2.963
18 2.823 5.547 2.804 3.463 2.004 1.923 0.840 2.433 1.276 11.290 2.405 2.878
19 2.647 4.994 2.543 2.982 1.696 1.728 0.795 7.974 1.163 6.946 2.244 2.788
20 2.595 4.606 2.339 2.694 1.554 1.562 0.773 5.319 1.050 7.940 2.180 2.540
21 2.622 4.386 2.508 2.508 1.490 1.416 0.813 3.028 0.958 15.400 15.040 3.936
22 5.444 4.092 5.961 3.092 1.423 1.359 0.819 2.252 0.914 23.350 9.657 3.455
23 18.220 3.743 8.951 4.782 1.361 1.303 0.732 1.870 0.895 22.900 5.718 3.664
24 18.690 3.455 5.233 4.009 1.284 1.258 0.705 1.822 1.491 16.120 4.977 8.000
25 8.700 3.239 3.994 5.630 1.254 1.245 0.703 1.691 1.976 11.030 7.883 6.220
26 8.388 3.913 3.394 5.247 1.291 1.179 0.686 1.430 2.033 11.870 5.840 4.263
27 10.790 4.578 3.496 4.159 1.410 1.189 0.629 1.264 34.190 9.512 12.350 9.566
28 7.069 4.233 4.057 4.680 1.967 1.144 0.607 1.124 25.780 7.077 11.200 11.380
29 5.610 3.271 7.163 1.549 1.158 0.580 1.050 10.000 5.746 25.730 6.656
30 5.282 2.829 4.988 1.529 1.150 0.568 1.000 9.851 5.156 19.650 4.784
31 4.767 3.268 1.381 0.558 0.951 5.141 3.993
Average 8.834 16.360 4.847 8.084 1.928 1.882 0.925 2.690 3.908 13.420 6.324 7.305
Lowest 2.595 3.239 2.339 2.508 1.254 1.114 0.558 0.550 0.681 4.207 2.180 2.540
Highest 31.670 62.470 17.740 33.010 3.724 9.451 2.299 10.730 34.190 50.370 25.730 27.420
Monthly total
(million cu m) 23.66 39.58 12.98 20.96 5.16 4.88 2.48 7.21 10.13 35.95 16.39 19.57
Runoff (mm) 84 140 46 74 18 17 9 26 36 127 58 69
Rainfall (mm) 74 136 50 110 41 66 42 113 118 159 82 66
Statistics of monthly data for previous record (Dec 1968 to Dec 2000----incomplete or missing months total 0.1 years)
Mean Avg. 11.400 8.915 8.028 4.914 2.878 2.424 1.774 2.784 3.646 7.252 10.330 11.630
flows: Low 2.163 3.062 1.259 0.923 0.611 0.604 0.427 0.289 0.522 0.754 1.391 1.423
(year) 1997 1993 1993 1974 1974 1970 1984 1976 1995 1995 1995 1995
High 18.450 19.660 22.520 10.970 7.757 9.430 5.927 10.910 10.360 21.380 28.720 26.480
(year) 1990 1995 1981 1986 1983 2000 1973 1985 1974 2000 2000 1999
Runoff: Avg. 108 77 76 45 27 22 17 26 33 69 95 110
Low 21 26 12 8 6 6 4 3 5 7 13 14
High 175 168 214 101 74 87 56 103 95 203 264 251
Rainfall: Avg. 124 86 101 72 69 77 74 90 102 117 123 129
Low 10 12 19 3 10 23 17 14 23 37 47 42
High 222 211 233 135 142 155 179 171 250 279 217 249
Summary statistics Factors affecting runoff
2001
For 2001 For record As % of $ Reservoir(s) in catchment.
preceding 2001 pre-2001
Mean flow 6.308 6.322 100
Lowest yearly mean 3.655 1971
Highest yearly mean 10.790 2000
Lowest monthly mean 0.925 Jul 0.289 Aug 1976
Highest monthly mean 16.360 Feb 28.720 Nov 2000
Lowest daily mean 0.550 2 Aug 0.180 23 Aug 1976
Highest daily mean 62.470 11 Feb 107.300 31 Oct 2000
10% exceedance 15.030 15.920 94
50% exceedance 3.443 3.015 114
95% exceedance 0.764 0.576 133
Annual total (million cu m) 198.90 199.50 100
Annual runoff (mm) 705 707 100
Annual rainfall (mm) 1057 1164 91
{1961-90 rainfall average (mm) 1153}
Station and catchment description
Velocity-area station rated by c/m cableway 150m d/s. The bridge sills provide the low flow control. Washland storage,
minor reservoirs, and the Leeds-Liverpool Canal can influence the flow pattern but small overall impact; minor net
export.
Geology: mainly Carboniferous Limestone with some Millstone Grit series. Rural catchment draining part of the eastern
Pennines.
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