027035 Aire at Kildwick Bridge 2000
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 7.289 17.760 7.953 2.080 4.037 2.767 1.193 1.363 4.460 8.778 99.800 13.670
2 6.414 11.360 46.190 2.550 3.516 5.336 4.198 1.785 2.737 6.924 82.160 9.663
3 8.803 8.721 42.990 2.951 3.136 43.010 1.878 2.049 1.812 5.886 69.040 8.369
4 7.648 20.630 21.230 2.415 2.864 86.470 1.464 1.162 1.468 5.909 43.990 15.820
5 6.843 12.380 11.560 2.130 2.498 36.580 1.318 0.954 1.378 11.160 43.070 11.220
6 6.300 9.378 11.250 1.948 2.300 28.170 1.228 0.885 1.571 6.676 56.640 8.555
7 6.453 11.230 23.860 1.813 2.107 17.610 1.138 0.874 2.330 24.930 38.150 12.060
8 7.306 11.480 42.060 1.794 1.971 12.020 1.110 0.991 2.506 16.330 33.000 32.210
9 5.774 8.537 21.420 1.738 1.886 7.055 1.804 0.930 1.822 35.580 18.760 20.500
10 6.284 13.740 14.190 1.721 1.770 5.049 1.686 0.933 8.708 45.700 13.840 23.190
11 20.060 11.310 11.820 2.332 1.653 3.984 1.321 0.886 4.750 40.810 15.130 30.170
12 44.950 30.260 8.299 6.535 1.572 3.365 1.157 0.924 3.854 20.390 30.570 23.850
13 28.120 14.660 6.920 9.095 1.514 3.016 1.096 0.988 2.713 12.420 31.560 36.050
14 14.410 13.100 5.950 5.213 1.465 2.847 1.066 5.159 2.131 9.895 18.690 20.730
15 10.360 14.760 4.897 3.650 1.409 2.466 0.985 2.429 2.226 8.302 13.210 12.340
16 7.836 15.260 4.356 2.990 1.658 2.220 0.929 2.290 2.019 6.481 14.590 9.032
17 6.740 13.480 3.932 3.092 2.652 2.075 0.890 2.213 2.444 5.922 14.030 7.619
18 5.913 16.810 3.537 4.009 3.870 1.866 0.883 1.755 12.640 9.629 16.140 6.317
19 5.274 10.990 3.261 9.859 4.423 1.709 0.864 1.463 20.500 5.999 15.710 12.450
20 4.658 8.328 3.054 14.000 3.620 1.524 0.828 1.272 35.810 5.325 14.020 12.290
21 4.229 10.850 3.020 8.383 5.409 1.671 0.785 1.407 15.660 4.548 10.920 7.830
22 4.102 7.739 2.779 22.750 2.880 1.821 0.748 1.510 13.620 3.925 18.490 6.447
23 3.546 6.670 4.127 11.030 2.764 1.485 0.735 1.165 7.722 8.027 14.650 5.999
24 3.344 6.328 4.002 8.851 3.012 1.418 0.731 1.007 29.140 15.000 12.340 10.380
25 3.100 5.627 3.205 17.020 6.715 1.360 0.727 1.025 22.700 28.020 17.180 7.055
26 2.915 4.875 2.849 21.500 12.400 1.258 0.728 2.330 20.830 11.130 23.010 5.510
27 2.844 18.450 2.687 12.910 14.290 1.199 0.785 1.803 28.680 11.560 18.440 4.485
28 14.080 14.740 2.495 7.875 5.762 1.169 0.817 1.604 25.440 29.610 34.510 4.016
29 42.410 11.340 2.327 5.937 3.902 1.198 0.838 1.789 14.310 45.280 17.810 3.596
30 31.070 2.190 4.829 3.079 1.175 0.769 1.275 11.970 105.400 12.180 3.172
31 25.450 2.126 2.643 2.371 1.398 107.300 4.245
Average 11.440 12.440 10.660 6.767 3.638 9.430 1.196 1.536 10.270 21.380 28.720 12.540
Lowest 2.844 4.875 2.126 1.721 1.409 1.169 0.727 0.874 1.378 3.925 10.920 3.172
Highest 44.950 30.260 46.190 22.750 14.290 86.470 4.198 5.159 35.810 107.300 99.800 36.050
Monthly total
(million cu m) 30.63 31.17 28.56 17.54 9.74 24.44 3.20 4.11 26.61 57.27 74.44 33.60
Runoff (mm) 109 110 101 62 35 87 11 15 94 203 264 119
Rainfall (mm) 123 126 100 117 85 114 66 91 172 279 217 126
Statistics of monthly data for previous record (Dec 1968 to Dec 1999----incomplete or missing months total 0.1 years)
Mean Avg. 11.390 8.801 7.943 4.855 2.854 2.198 1.793 2.824 3.432 6.796 9.732 11.600
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 6.209 5.927 10.910 10.360 20.730 17.020 26.480
(year) 1990 1995 1981 1986 1983 1982 1973 1985 1974 1998 1991 1999
Runoff: Avg. 108 76 75 45 27 20 17 27 32 64 89 110
Low 21 26 12 8 6 6 4 3 5 7 13 14
High 175 168 214 101 74 57 56 103 95 197 156 251
Rainfall: Avg. 124 85 102 70 69 76 75 90 99 112 120 129
Low 10 12 19 3 10 23 17 14 23 37 47 42
High 222 211 233 135 142 155 179 171 250 228 195 249
Summary statistics Factors affecting runoff
2000
For 2000 For record As % of $ Reservoir(s) in catchment.
preceding 2000 pre-2000
Mean flow 10.790 6.178 175
Lowest yearly mean 3.655 1971
Highest yearly mean 8.581 1998
Lowest monthly mean 1.196 Jul 0.289 Aug 1976
Highest monthly mean 28.720 Nov 26.480 Dec 1999
Lowest daily mean 0.727 25 Jul 0.180 23 Aug 1976
Highest daily mean 107.300 31 Oct 79.900 27 Oct 1980
10% exceedance 27.830 15.620 178
50% exceedance 5.730 2.960 194
95% exceedance 0.926 0.570 163
Annual total (million cu m) 341.20 195.00 175
Annual runoff (mm) 1209 691 175
Annual rainfall (mm) 1616 1151 140
{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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