055013 Arrow at Titley Mill 1998
Measuring authority: EA Grid reference: 32 (SO) 328 585 Catchment area (sq km): 126.4
First year: 1966 Level stn. (m OD): 129.00 Max alt. (m OD): 542
Daily mean gauged discharges (cubic metres per second)
DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1 6.164 1.688 0.896 1.376 2.124 0.697 1.406 0.551 0.304 1.334 12.090 1.960
2 14.730 1.598 1.164 2.406 1.955 3.593 1.297 0.507 0.290 1.149 11.510 1.927
3 18.540 1.493 6.457 3.286 1.796 1.472 1.174 0.663 0.287 1.069 8.240 1.906
4 16.440 1.412 6.374 8.187 1.713 1.126 1.100 0.564 0.378 1.019 6.382 1.814
5 11.870 1.324 5.349 9.070 1.694 1.177 1.043 0.491 0.395 0.974 6.205 1.726
6 9.867 1.452 11.040 6.908 1.601 1.253 1.043 0.480 0.303 1.154 5.131 1.589
7 9.935 1.449 8.447 5.254 1.466 1.037 0.922 0.474 0.303 0.941 5.416 1.553
8 18.780 1.275 6.078 4.687 1.364 1.144 0.869 0.457 0.391 0.865 8.583 1.647
9 10.900 1.201 4.542 23.950 1.254 1.126 0.831 0.449 0.643 0.887 7.953 1.536
10 7.782 1.133 4.101 13.870 1.197 1.280 0.795 0.438 0.519 0.855 6.206 1.640
11 6.063 1.088 3.380 8.586 1.207 1.409 0.885 0.415 0.475 0.833 5.824 1.710
12 5.229 1.042 2.945 6.050 1.116 1.217 0.857 0.415 0.759 0.763 5.521 2.813
13 6.285 0.997 2.601 4.916 1.055 2.718 0.770 0.420 0.825 0.796 4.849 2.546
14 5.447 0.962 2.283 4.277 0.997 2.000 0.696 0.445 0.682 0.805 4.488 2.541
15 5.676 0.947 2.076 3.649 0.928 1.736 0.658 0.424 0.639 0.718 3.826 2.686
16 5.083 0.911 1.942 3.177 0.868 1.526 0.627 0.391 0.570 2.440 3.441 2.551
17 5.221 0.866 1.784 2.682 0.821 1.453 0.644 0.386 0.546 2.704 3.197 2.578
18 8.894 0.862 1.624 2.367 0.781 1.452 0.588 0.362 0.554 2.204 2.954 3.665
19 6.542 0.851 1.509 2.362 0.745 1.249 0.573 0.346 0.517 2.006 2.679 4.194
20 5.385 0.864 1.425 2.140 0.716 1.434 0.937 0.345 0.477 2.137 2.407 3.627
21 4.931 1.004 1.342 2.194 0.683 1.146 0.837 0.360 0.466 2.652 2.237 3.375
22 4.199 0.829 1.281 2.400 0.664 1.038 0.659 0.330 0.458 24.090 2.317 3.339
23 3.603 0.783 1.219 2.949 0.647 1.020 0.684 0.459 0.437 25.170 2.221 3.522
24 3.172 0.748 1.172 2.559 0.630 1.046 0.560 0.375 0.446 33.390 2.640 3.227
25 2.857 0.721 1.627 2.516 0.610 1.001 0.530 0.341 0.463 16.660 2.230 9.971
26 2.615 0.729 1.495 2.824 0.913 1.453 0.561 0.335 0.707 11.010 2.096 12.240
27 2.430 0.755 1.373 2.758 0.703 2.322 0.543 0.313 0.625 44.080 2.109 8.808
28 2.221 0.818 1.235 2.650 0.631 1.803 0.517 0.300 0.529 35.840 2.473 7.381
29 2.067 1.276 2.581 0.607 1.724 0.504 0.293 0.545 18.800 2.130 5.895
30 1.931 1.366 2.328 0.560 1.591 0.643 0.289 1.912 13.150 2.035 5.005
31 1.796 1.284 0.565 0.534 0.289 17.700 4.399
Average 6.989 1.064 2.925 4.832 1.052 1.475 0.784 0.410 0.548 8.651 4.646 3.657
Lowest 1.796 0.721 0.896 1.376 0.560 0.697 0.504 0.289 0.287 0.718 2.035 1.536
Highest 18.780 1.688 11.040 23.950 2.124 3.593 1.406 0.663 1.912 44.080 12.090 12.240
Monthly total
(million cu m) 18.72 2.57 7.84 12.52 2.82 3.82 2.10 1.10 1.42 23.17 12.04 9.80
Runoff (mm) 148 20 62 99 22 30 17 9 11 183 95 77
Rainfall (mm) 148 26 101 150 29 142 64 37 104 251 83 104
Statistics of monthly data for previous record (Oct 1966 to Dec 1997)
Mean Avg. 4.733 4.068 3.334 2.179 1.599 1.059 0.660 0.598 0.817 1.791 3.030 4.332
flows: Low 0.565 1.369 0.666 0.600 0.355 0.257 0.210 0.112 0.135 0.204 0.662 1.369
(year) 1997 1992 1993 1997 1990 1990 1976 1995 1990 1995 1978 1988
High 9.004 8.767 8.940 5.028 5.001 2.559 3.842 2.220 2.643 6.916 6.625 8.477
(year) 1982 1990 1981 1987 1983 1972 1968 1992 1992 1967 1986 1989
Runoff: Avg. 100 79 71 45 34 22 14 13 17 38 62 92
Low 12 27 14 12 8 5 4 2 3 4 14 29
High 191 168 189 103 106 52 81 47 54 147 136 180
Rainfall: Avg. 111 86 83 60 72 65 56 75 87 95 101 111
Low 10 8 17 7 13 11 13 7 14 16 34 36
High 206 206 203 160 173 173 134 215 226 191 187 213
Summary statistics Factors affecting runoff
1998
For 1998 For record As % of
preceding 1998 pre-1998 $ Natural to within 10% at 95 percentile flow.
Mean flow 3.105 2.343 133
Lowest yearly mean 1.309 1973
Highest yearly mean 3.418 1982
Lowest monthly mean 0.410 Aug 0.112 Aug 1995
Highest monthly mean 8.651 Oct 9.004 Jan 1982
Lowest daily mean 0.287 3 Sep 0.090 28 Sep 1990
Highest daily mean 44.080 27 Oct 39.610 27 Dec 1979
10% exceedance 7.031 5.410 130
50% exceedance 1.429 1.425 100
95% exceedance 0.379 0.256 148
Annual total (million cu m) 97.92 73.94 132
Annual runoff (mm) 775 585 132
Annual rainfall (mm) 1239 1002 124
{1961-90 rainfall average (mm) 962}
Station and catchment description
Velocity-area station. Low flow control is a stable riffle; otherwise a three-bay road bridge 50m d/s is the control.
Gets out of bank but not bypassed. Intake pipes silted up during summer of 1994, treat data with caution. 1995 summer
flows suspect and under investigation by EA. Natural catchment.
Headwaters of moderate relief, draining durable Silurian slates and shales; otherwise, catchment underlain by ORS marls.
Station is in a transition zone between upland plateau supporting sheep grazing and the more productive lowlands.
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