055013 Arrow at Titley Mill 2001
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 6.414 2.913 1.720 3.360 3.787 1.052 0.466 0.575 0.716 0.971 3.034 3.531
2 9.131 3.152 1.624 3.620 3.380 1.015 0.450 0.939 0.804 0.725 2.719 3.194
3 7.658 4.418 1.557 3.963 3.049 0.970 0.514 0.723 0.732 0.595 2.532 3.825
4 6.421 7.329 1.481 4.011 2.738 0.930 0.762 0.720 0.654 0.575 2.356 4.260
5 5.658 6.154 1.399 5.314 2.462 0.922 0.523 0.647 0.658 0.769 2.192 4.980
6 4.752 5.720 2.029 4.928 2.231 0.915 0.499 0.651 0.629 1.236 2.168 4.060
7 4.177 4.882 2.137 4.571 2.060 0.873 0.945 0.681 0.605 3.030 3.951 3.637
8 3.704 4.150 1.866 6.693 1.985 0.835 0.560 0.618 0.566 2.944 4.007 3.173
9 3.390 3.588 1.946 5.729 2.394 0.808 0.499 0.692 0.541 2.361 3.283 2.849
10 3.094 3.584 2.065 5.133 2.346 0.770 0.502 0.584 0.535 1.970 3.010 2.588
11 2.794 4.488 2.185 4.313 1.965 0.765 0.473 0.579 0.532 1.760 2.758 2.351
12 2.585 15.080 2.535 3.890 1.784 0.743 0.442 0.805 0.569 1.596 2.618 2.196
13 2.379 7.674 3.184 3.493 1.734 0.729 0.456 0.674 0.561 1.477 2.279 2.031
14 2.244 5.933 2.878 3.225 1.684 0.793 0.444 0.605 0.519 1.438 2.077 1.872
15 2.175 4.848 3.028 2.952 1.642 1.027 0.443 0.607 0.482 1.747 1.926 1.770
16 2.044 4.073 3.392 2.622 1.632 0.955 0.420 0.784 0.472 1.484 1.820 1.676
17 1.926 3.519 4.211 2.547 2.976 0.771 1.898 0.634 0.465 1.493 1.740 1.589
18 1.830 3.165 4.561 2.347 1.921 0.696 3.420 0.973 0.460 2.034 1.665 1.533
19 1.727 2.911 3.923 2.164 1.744 0.662 1.556 2.388 0.454 5.178 1.561 1.496
20 1.644 2.693 3.792 2.006 1.656 0.638 1.268 1.785 0.439 8.692 1.476 1.457
21 1.696 2.501 4.334 1.927 1.592 0.611 1.142 1.511 0.435 5.098 1.468 1.732
22 6.069 2.361 8.544 3.146 1.511 0.591 0.981 1.313 0.440 4.640 1.451 1.537
23 8.857 2.218 11.440 2.356 1.443 0.572 0.875 1.211 0.436 4.777 1.353 1.401
24 6.783 2.040 9.064 4.854 1.385 0.556 0.820 1.134 0.428 5.801 1.310 1.490
25 6.099 1.929 6.848 4.212 1.363 0.526 0.761 1.026 0.430 8.267 1.428 1.837
26 5.131 2.172 5.522 3.647 1.315 0.513 0.698 0.947 0.473 13.030 1.353 1.609
27 4.356 1.991 7.082 3.444 1.284 0.500 0.688 0.874 0.514 7.934 1.480 2.158
28 3.731 1.866 5.729 6.239 1.226 0.493 0.647 0.837 0.483 6.044 1.565 2.118
29 3.346 4.821 5.721 1.155 0.497 0.623 0.799 0.448 4.727 2.698 2.059
30 3.631 4.178 4.444 1.135 0.480 0.620 0.814 0.631 4.150 2.918 1.907
31 3.064 3.792 1.092 0.588 0.765 3.646 1.710
Average 4.145 4.191 3.963 3.896 1.925 0.740 0.806 0.900 0.537 3.554 2.207 2.375
Lowest 1.644 1.866 1.399 1.927 1.092 0.480 0.420 0.575 0.428 0.575 1.310 1.401
Highest 9.131 15.080 11.440 6.693 3.787 1.052 3.420 2.388 0.804 13.030 4.007 4.980
Monthly total
(million cu m) 11.10 10.14 10.62 10.10 5.16 1.92 2.16 2.41 1.39 9.52 5.72 6.36
Runoff (mm) 88 80 84 80 41 15 17 19 11 75 45 50
Rainfall (mm) 86 84 120 107 44 33 104 99 46 187 63 43
Statistics of monthly data for previous record (Oct 1966 to Dec 2000)
Mean Avg. 4.831 3.889 3.310 2.336 1.590 1.070 0.655 0.583 0.889 2.110 3.210 4.537
flows: Low 0.565 1.064 0.666 0.600 0.355 0.257 0.210 0.112 0.135 0.204 0.662 1.369
(year) 1997 1998 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 3.409 8.651 7.915 9.463
(year) 1982 1990 1981 1987 1983 1972 1968 1992 1999 1998 2000 2000
Runoff: Avg. 102 75 70 48 34 22 14 12 18 45 66 96
Low 12 20 14 12 8 5 4 2 3 4 14 29
High 191 168 189 103 106 52 81 47 70 183 162 201
Rainfall: Avg. 112 85 82 68 71 67 55 75 91 103 102 117
Low 10 8 17 7 13 11 13 7 14 16 34 36
High 206 206 203 180 173 173 134 215 226 251 187 255
Summary statistics Factors affecting runoff
2001
For 2001 For record As % of
preceding 2001 pre-2001 $ Natural to within 10% at 95 percentile flow.
Mean flow 2.429 2.412 101
Lowest yearly mean 1.309 1973
Highest yearly mean 3.418 1982
Lowest monthly mean 0.537 Sep 0.112 Aug 1995
Highest monthly mean 4.191 Feb 9.463 Dec 2000
Lowest daily mean 0.420 16 Jul 0.090 28 Sep 1990
Highest daily mean 15.080 12 Feb 44.080 27 Oct 1998
10% exceedance 5.103 5.629 91
50% exceedance 1.807 1.454 124
95% exceedance 0.470 0.263 179
Annual total (million cu m) 76.60 76.12 101
Annual runoff (mm) 606 602 101
Annual rainfall (mm) 1016 1028 99
{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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