027035 Aire at Kildwick Bridge 1998
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 15.540 2.838 11.290 4.073 2.544 1.047 2.562 8.733 7.955 5.939 13.290 5.707
2 15.420 2.632 24.010 8.409 2.240 4.175 2.200 5.398 4.451 3.308 17.860 4.927
3 37.380 2.453 41.710 15.980 2.039 4.292 1.926 13.720 2.749 2.284 19.860 4.536
4 27.140 2.606 37.130 22.020 1.923 2.283 1.748 8.494 2.193 1.965 12.640 4.212
5 21.820 2.360 24.010 18.710 2.616 1.752 1.678 5.245 1.959 1.947 22.890 3.638
6 14.940 2.723 48.010 40.200 4.495 4.080 1.578 5.157 1.785 1.900 13.380 3.153
7 15.430 4.249 48.290 18.670 4.355 5.749 1.535 6.599 1.675 1.715 11.560 3.162
8 51.770 3.581 31.450 16.690 6.941 12.300 1.490 4.904 1.738 1.569 27.330 13.140
9 45.450 3.706 16.610 16.090 3.866 12.650 1.496 3.770 10.150 2.201 22.660 7.468
10 29.260 8.791 18.300 9.280 3.091 9.357 1.454 3.128 11.080 2.502 12.780 6.037
11 15.670 9.561 15.750 6.816 3.077 12.160 1.385 2.678 5.894 2.992 9.558 5.657
12 10.450 7.007 12.940 5.503 2.643 5.921 2.300 2.427 7.382 4.776 21.030 13.810
13 13.300 5.177 10.570 4.650 2.268 5.453 4.163 2.147 4.549 12.370 15.990 21.550
14 11.940 4.246 7.752 4.489 2.039 6.977 2.883 2.418 3.285 18.300 10.150 17.630
15 12.620 3.706 6.281 4.514 1.794 6.452 2.221 2.343 2.712 6.467 7.796 10.630
16 14.520 3.275 5.311 3.763 1.604 4.493 1.932 1.973 2.330 41.410 6.342 7.638
17 11.150 2.973 4.674 3.212 1.473 3.883 4.870 2.497 2.069 36.090 5.427 6.320
18 31.360 2.981 4.024 2.841 1.384 8.645 3.228 2.147 1.943 17.250 5.495 7.549
19 17.370 2.717 3.540 2.769 1.318 6.450 3.200 1.822 1.824 15.130 4.926 8.487
20 10.160 2.557 3.298 3.013 1.238 4.233 6.962 2.111 1.686 15.800 4.336 5.913
21 8.315 2.592 2.984 2.863 1.164 3.316 14.120 4.771 1.618 28.970 4.019 4.783
22 8.889 2.379 2.716 7.291 1.113 2.795 8.916 2.501 1.560 27.570 5.187 4.761
23 7.308 2.222 2.575 7.794 1.113 2.623 8.293 2.635 1.477 35.740 5.521 5.863
24 6.128 2.154 2.873 5.236 1.080 2.466 4.854 3.072 1.413 46.160 8.424 8.229
25 5.244 2.030 6.322 4.256 1.046 2.402 3.333 2.989 1.397 40.480 6.956 21.140
26 4.409 2.025 12.800 5.435 1.042 4.596 2.765 4.314 1.378 30.900 18.460 17.370
27 3.912 2.309 6.531 4.816 1.057 9.426 2.554 2.618 1.357 61.920 10.360 11.680
28 3.465 3.009 4.646 4.103 1.620 4.692 2.378 2.112 1.320 64.780 12.830 13.460
29 3.349 6.594 3.554 1.819 3.669 5.489 1.844 1.325 49.430 8.263 10.450
30 3.155 9.172 2.973 1.247 3.021 27.890 1.701 3.611 37.890 6.592 8.953
31 3.026 5.113 1.121 14.210 1.682 22.730 6.728
Average 15.480 3.531 14.110 8.667 2.141 5.379 4.697 3.805 3.195 20.730 11.730 8.857
Lowest 3.026 2.025 2.575 2.769 1.042 1.047 1.385 1.682 1.320 1.569 4.019 3.153
Highest 51.770 9.561 48.290 40.200 6.941 12.650 27.890 13.720 11.080 64.780 27.330 21.550
Monthly total
(million cu m) 41.46 8.54 37.78 22.47 5.73 13.94 12.58 10.19 8.28 55.51 30.41 23.72
Runoff (mm) 147 30 134 80 20 49 45 36 29 197 108 84
Rainfall (mm) 146 55 143 115 50 139 115 74 62 228 109 95
Statistics of monthly data for previous record (Dec 1968 to Dec 1997----incomplete or missing months total 0.1 years)
Mean Avg. 11.060 9.103 7.639 4.703 2.791 2.024 1.684 2.849 3.477 6.221 9.839 11.200
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 17.570 17.020 24.080
(year) 1990 1995 1981 1986 1983 1982 1973 1985 1974 1981 1991 1993
Runoff: Avg. 105 79 72 43 26 19 16 27 32 59 90 106
Low 21 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. 122 86 100 68 68 73 74 91 100 108 122 127
Low 10 12 19 3 10 23 17 14 23 37 47 42
High 222 211 233 135 142 155 179 171 250 213 195 249
Summary statistics Factors affecting runoff
1998
For 1998 For record As % of $ Reservoir(s) in catchment.
preceding 1998 pre-1998
Mean flow 8.581 6.038 142
Lowest yearly mean 3.655 1971
Highest yearly mean 8.060 1981
Lowest monthly mean 2.141 May 0.289 Aug 1976
Highest monthly mean 20.730 Oct 24.080 Dec 1993
Lowest daily mean 1.042 26 May 0.180 23 Aug 1976
Highest daily mean 64.780 28 Oct 79.900 27 Oct 1980
10% exceedance 20.110 15.310 131
50% exceedance 4.595 2.863 160
95% exceedance 1.396 0.556 251
Annual total (million cu m) 270.60 190.60 142
Annual runoff (mm) 959 675 142
Annual rainfall (mm) 1331 1139 117
{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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