027035 Aire at Kildwick Bridge 1999
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 5.692 6.583 27.240 2.514 2.338 1.713 2.431 1.095 0.855 38.530 5.151 4.210
2 6.032 5.520 51.840 2.419 2.197 4.809 2.240 0.945 0.832 55.570 15.550 21.890
3 13.070 4.989 56.100 2.233 2.061 6.705 2.754 0.872 0.778 37.510 8.961 57.740
4 15.120 5.024 37.160 2.109 1.960 4.641 2.312 0.823 0.700 27.210 6.165 39.030
5 23.540 4.958 20.130 2.050 1.890 5.739 8.793 0.829 0.679 12.900 12.050 31.550
6 32.260 4.314 11.170 2.078 1.953 4.421 6.243 0.820 0.679 7.766 10.380 66.820
7 25.620 3.723 10.640 1.914 17.040 11.720 3.112 0.861 1.092 5.965 6.294 63.450
8 16.870 3.327 8.227 1.921 17.980 15.020 2.367 0.795 0.835 7.079 5.651 50.420
9 10.090 2.867 7.885 1.909 9.173 6.830 1.946 0.918 0.720 6.895 4.665 53.780
10 7.471 2.603 6.878 1.949 12.610 4.513 1.705 0.872 0.676 7.119 3.991 34.330
11 5.983 2.531 5.628 4.406 10.540 3.709 1.541 0.794 0.694 5.855 3.560 53.000
12 5.559 2.498 5.483 9.156 12.330 3.559 1.465 0.868 0.710 4.576 3.284 41.400
13 9.010 2.540 4.467 9.340 15.640 3.359 1.442 1.375 0.661 3.720 3.016 29.530
14 17.690 2.653 3.794 5.498 10.610 2.954 1.416 2.889 0.653 3.209 2.758 17.880
15 48.440 2.582 3.492 6.068 6.420 2.493 1.331 2.499 0.641 2.813 2.746 12.520
16 38.910 2.540 3.225 11.800 4.857 2.195 1.323 1.838 0.686 2.494 3.200 16.930
17 22.900 4.402 3.012 6.565 4.008 2.029 1.201 1.732 0.641 2.210 2.732 35.780
18 16.500 10.850 2.840 7.817 3.424 1.857 1.259 1.541 0.611 1.956 2.445 14.300
19 21.830 14.110 2.589 7.180 3.078 1.979 1.317 1.320 1.023 1.794 2.259 9.239
20 18.650 6.397 2.704 16.090 2.805 2.797 1.752 1.103 5.900 1.669 2.043 7.103
21 11.470 7.797 10.090 11.140 2.722 2.003 2.522 0.981 3.025 1.843 1.988 8.245
22 8.690 7.665 5.161 10.260 2.449 1.794 2.073 0.910 1.932 3.509 2.093 22.160
23 7.987 5.434 5.563 7.524 2.357 1.686 1.603 0.919 3.897 6.194 1.981 17.100
24 10.920 4.899 5.281 7.528 2.486 1.577 1.424 0.889 4.362 9.256 2.327 24.540
25 22.970 5.124 6.651 5.248 2.135 1.495 1.280 1.007 3.580 11.970 2.726 20.070
26 27.120 5.213 5.258 4.212 2.002 1.470 1.170 1.080 2.648 5.744 3.794 18.340
27 20.900 4.343 3.878 3.478 1.945 2.117 1.112 0.952 7.692 4.263 5.653 14.390
28 18.040 13.490 3.337 3.050 2.104 10.320 1.082 0.889 5.267 3.662 4.205 9.595
29 11.470 3.359 2.776 2.048 3.797 1.004 0.862 10.030 3.172 3.743 7.419
30 9.278 3.032 2.541 2.018 2.558 0.950 0.835 8.992 4.047 3.987 9.690
31 7.623 2.736 1.813 0.907 0.838 4.970 8.576
Average 16.700 5.321 10.610 5.426 5.387 4.062 2.035 1.127 2.383 9.531 4.647 26.480
Lowest 5.559 2.498 2.589 1.909 1.813 1.470 0.907 0.794 0.611 1.669 1.981 4.210
Highest 48.440 14.110 56.100 16.090 17.980 15.020 8.793 2.889 10.030 55.570 15.550 66.820
Monthly total
(million cu m) 44.73 12.87 28.41 14.06 14.43 10.53 5.45 3.02 6.18 25.53 12.04 70.94
Runoff (mm) 158 46 101 50 51 37 19 11 22 90 43 251
Rainfall (mm) 166 71 99 81 100 115 48 71 111 117 59 237
Statistics of monthly data for previous record (Dec 1968 to Dec 1998----incomplete or missing months total 0.1 years)
Mean Avg. 11.210 8.917 7.854 4.835 2.770 2.136 1.785 2.881 3.467 6.705 9.902 11.120
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 24.080
(year) 1990 1995 1981 1986 1983 1982 1973 1985 1974 1998 1991 1993
Runoff: Avg. 106 77 75 44 26 20 17 27 32 64 91 106
Low 21 26 12 8 6 6 4 3 5 7 13 14
High 175 168 214 101 74 57 56 103 95 197 156 228
Rainfall: Avg. 123 85 102 70 68 75 76 90 99 112 122 126
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
1999
For 1999 For record As % of $ Reservoir(s) in catchment.
preceding 1999 pre-1999
Mean flow 7.870 6.123 129
Lowest yearly mean 3.655 1971
Highest yearly mean 8.581 1998
Lowest monthly mean 1.127 Aug 0.289 Aug 1976
Highest monthly mean 26.480 Dec 24.080 Dec 1993
Lowest daily mean 0.611 18 Sep 0.180 23 Aug 1976
Highest daily mean 66.820 6 Dec 79.900 27 Oct 1980
10% exceedance 18.340 15.490 118
50% exceedance 3.734 2.928 128
95% exceedance 0.825 0.562 147
Annual total (million cu m) 248.20 193.20 128
Annual runoff (mm) 879 684 128
Annual rainfall (mm) 1275 1148 111
{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.
In line with Natural Environment Research Council policy, the provision of data from the National River Flow Archive confers only a right to use the data. Ownership of the data, or the associated Intellectual Property Rights, will not normally be transferred. Data received from the NRFA must not be sold, or passed on to any third party. Reproduction is authorised, except for commercial purposes, provided the sources is acknowledged.
Through the use of quality control procedures every effort is made to maintain and improve the quality of data. However, NERC, the Environment Agency, the Scottish Environment Protection Agency and the Rivers Agency accepts no liability for any loss or damage, cost or claims arising directly or indirectly their use.