027035 Aire at Kildwick Bridge 1996
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 1.203 1.089 3.276 1.381 10.260 1.554 1.746 0.873 1.859 2.575 6.215 12.870
2 1.361 1.074 3.065 1.322 7.488 1.372 1.160 0.831 1.702 1.809 5.928 11.680
3 1.244 1.066 2.829 1.221 4.381 1.232 3.062 0.779 1.555 2.043 6.489 34.870
4 1.525 1.114 2.475 1.164 3.194 1.124 5.599 0.740 1.398 5.061 16.850 24.070
5 2.874 1.093 2.206 1.148 2.620 1.044 2.823 0.714 1.249 3.813 32.760 14.750
6 4.936 1.121 2.045 1.127 2.274 0.992 1.682 1.150 1.171 2.413 40.830 10.050
7 6.713 1.082 1.943 1.083 1.980 1.178 1.479 0.925 1.093 1.957 22.580 7.736
8 7.360 1.038 1.875 1.055 1.789 1.417 1.232 0.731 1.029 1.792 15.320 6.385
9 5.758 4.168 1.974 1.063 1.582 1.268 1.108 0.691 1.009 1.678 15.440 5.505
10 3.671 16.880 1.799 1.167 1.496 1.305 1.043 3.881 0.977 1.479 11.810 4.581
11 3.101 19.060 2.126 1.071 1.452 1.707 1.022 1.636 0.973 1.345 9.408 4.263
12 3.907 26.350 2.918 1.121 1.357 1.472 1.104 1.088 0.928 1.257 12.980 3.944
13 7.622 13.880 2.308 1.048 1.173 1.239 1.074 0.900 0.859 1.182 8.137 3.546
14 6.666 7.907 2.115 1.050 1.108 1.152 1.406 0.782 0.843 1.207 6.468 3.427
15 4.042 6.191 2.078 1.043 1.064 0.937 1.145 0.709 0.830 1.547 5.577 3.472
16 2.996 7.589 3.968 1.132 1.029 0.778 1.035 0.673 0.810 1.452 5.204 3.463
17 2.495 11.670 5.748 1.475 1.003 0.769 0.972 0.650 0.778 1.354 7.200 3.172
18 2.160 24.060 5.188 2.667 0.977 0.711 0.963 0.614 0.762 2.950 5.689 9.329
19 1.987 10.390 4.389 2.556 1.104 0.679 0.907 0.590 0.760 3.372 8.516 34.930
20 1.900 6.837 3.811 1.962 1.326 0.684 0.841 1.141 0.761 7.331 14.870 28.980
21 1.704 5.527 3.974 1.652 1.062 0.671 0.701 1.191 0.745 6.665 8.232 13.060
22 1.569 6.129 3.483 1.727 1.251 0.641 0.650 0.858 0.728 3.828 11.090 8.461
23 1.473 7.504 3.279 9.257 1.542 0.625 0.680 1.686 0.724 2.881 9.136 6.748
24 1.335 12.230 2.987 6.810 1.592 0.617 0.649 5.911 0.734 2.590 11.320 5.399
25 1.086 9.161 2.716 6.383 1.287 0.656 0.612 6.877 0.774 2.686 26.220 4.517
26 1.161 6.351 2.496 4.639 1.512 0.819 0.596 21.140 0.843 11.270 15.080 4.077
27 1.125 4.996 2.058 3.661 3.179 0.698 0.601 15.660 0.846 10.930 9.214 3.877
28 1.140 4.059 1.946 2.980 1.903 1.088 0.892 7.081 1.017 9.054 8.651 3.757
29 1.207 3.542 1.723 3.003 2.323 0.830 1.576 4.680 10.590 7.003 25.550 3.547
30 1.162 1.560 4.694 3.137 0.875 1.347 3.016 4.741 4.669 19.950 3.774
31 1.105 1.464 2.141 1.045 2.243 6.343 3.274
Average 2.825 7.695 2.768 2.389 2.245 1.004 1.315 2.917 1.436 3.727 13.420 9.404
Lowest 1.086 1.038 1.464 1.043 0.977 0.617 0.596 0.590 0.724 1.182 5.204 3.172
Highest 7.622 26.350 5.748 9.257 10.260 1.707 5.599 21.140 10.590 11.270 40.830 34.930
Monthly total
(million cu m) 7.57 19.28 7.41 6.19 6.01 2.60 3.52 7.81 3.72 9.98 34.79 25.19
Runoff (mm) 27 68 26 22 21 9 12 28 13 35 123 89
Rainfall (mm) 57 91 36 70 59 48 71 121 50 94 148 85
Statistics of monthly data for previous record (Dec 1968 to Dec 1995----incomplete or missing months total 0.1 years)
Mean Avg. 11.720 8.773 7.821 4.887 2.685 2.075 1.717 2.922 3.602 6.414 9.853 11.220
flows: Low 4.463 3.062 1.259 0.923 0.611 0.604 0.427 0.289 0.522 0.754 1.391 1.423
(year) 1973 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 17.570 17.020 24.080
(year) 1990 1995 1981 1986 1983 1982 1973 1985 1974 1981 1991 1993
Runoff: Avg. 111 76 74 45 25 19 16 28 33 61 90 106
Low 42 26 12 8 6 6 4 3 5 7 13 14
High 175 168 214 101 74 57 56 103 95 167 156 228
Rainfall: Avg. 128 81 104 69 68 73 74 91 103 109 122 128
Low 45 12 19 3 10 23 17 14 23 37 47 42
High 222 191 233 135 142 155 179 171 250 213 195 249
Summary statistics Factors affecting runoff
1996
For 1996 For record As % of $ Reservoir(s) in catchment.
preceding 1996 pre-1996
Mean flow 4.240 6.132 69
Lowest yearly mean 3.655 1971
Highest yearly mean 8.060 1981
Lowest monthly mean 1.004 Jun 0.289 Aug 1976
Highest monthly mean 13.420 Nov 24.080 Dec 1993
Lowest daily mean 0.590 19 Aug 0.180 23 Aug 1976
Highest daily mean 40.830 6 Nov 79.900 27 Oct 1980
10% exceedance 10.220 15.560 66
50% exceedance 1.851 2.934 63
95% exceedance 0.695 0.543 128
Annual total (million cu m) 134.10 193.50 69
Annual runoff (mm) 475 685 69
Annual rainfall (mm) 930 1150 81
{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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