055013 Arrow at Titley Mill 1996
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 2.531 1.254 2.519 2.689 4.144 1.476 0.485 0.264 0.239 0.187 0.608 3.366
2 2.370 1.209 2.339 2.378 3.005 1.393 0.447 0.264 0.236 0.184 0.601 4.025
3 2.171 1.154 2.159 2.112 2.492 1.357 0.480 0.264 0.235 0.182 0.616 9.028
4 2.039 1.128 1.989 1.932 2.271 1.222 0.428 0.260 0.234 0.180 1.535 6.803
5 3.473 1.242 1.823 1.802 2.110 1.146 0.475 0.260 0.231 0.180 1.398 5.027
6 6.160 1.204 1.714 1.682 1.959 1.086 0.419 0.260 0.230 0.179 1.635 4.005
7 7.785 1.114 1.620 1.540 1.812 1.095 0.387 0.260 0.226 0.177 2.209 3.281
8 9.754 1.049 1.794 1.448 1.643 0.969 0.359 0.260 0.226 0.177 1.755 2.798
9 8.780 5.107 1.748 1.383 1.548 0.924 0.358 0.260 0.224 0.174 1.550 2.472
10 6.780 12.710 1.547 1.335 1.476 0.891 0.339 0.275 0.222 0.173 1.385 2.204
11 7.721 11.310 2.143 1.283 1.403 1.133 0.329 0.277 0.222 0.173 1.267 1.987
12 8.461 13.310 2.912 4.189 1.314 0.865 0.325 0.268 0.218 0.173 1.145 1.818
13 7.753 7.705 2.317 3.001 1.230 0.775 0.317 0.262 0.218 0.173 0.988 1.644
14 6.369 5.486 2.178 2.503 1.167 0.738 0.299 0.260 0.215 0.233 0.902 1.500
15 5.118 4.470 2.413 2.342 1.124 0.698 0.289 0.256 0.214 0.298 0.840 1.397
16 4.295 3.775 3.242 2.435 1.091 0.656 0.283 0.256 0.211 0.275 0.807 1.350
17 3.758 3.960 2.966 2.359 1.063 0.624 0.284 0.252 0.209 0.267 0.849 1.300
18 3.346 5.405 3.735 2.654 1.144 0.614 0.275 0.251 0.207 0.262 0.790 1.427
19 3.059 4.009 3.333 2.460 1.620 0.588 0.273 0.251 0.203 0.256 1.137 1.484
20 2.718 3.427 3.814 2.338 1.185 0.580 0.272 0.247 0.203 0.252 1.536 1.501
21 2.402 3.193 5.115 2.439 1.148 0.547 0.269 0.247 0.199 0.251 1.188 1.335
22 2.233 3.093 5.415 2.650 1.285 0.524 0.268 0.264 0.198 0.248 1.227 1.219
23 2.352 3.160 5.285 3.133 2.205 0.496 0.268 0.303 0.195 0.245 1.175 1.176
24 2.147 3.929 4.913 2.519 4.000 0.481 0.264 0.274 0.195 0.240 4.016 1.098
25 1.858 3.974 8.145 2.308 2.773 0.469 0.264 0.268 0.193 0.255 6.242 1.018
26 1.680 3.728 8.470 2.178 2.602 0.483 0.264 0.262 0.192 0.304 4.561 0.948
27 1.606 3.344 6.459 2.044 2.264 0.448 0.264 0.260 0.190 0.640 3.468 0.944
28 1.513 3.003 5.161 1.898 2.052 0.495 0.264 0.255 0.188 0.710 3.163 0.902
29 1.438 2.731 4.207 1.797 1.938 0.451 0.264 0.251 0.188 0.577 3.884 0.861
30 1.354 3.531 1.800 1.817 0.444 0.264 0.247 0.188 0.402 3.730 0.850
31 1.292 3.099 1.588 0.264 0.243 0.635 0.733
Average 4.010 4.144 3.487 2.221 1.886 0.789 0.324 0.261 0.212 0.279 1.874 2.242
Lowest 1.292 1.049 1.547 1.283 1.063 0.444 0.264 0.243 0.188 0.173 0.601 0.733
Highest 9.754 13.310 8.470 4.189 4.144 1.476 0.485 0.303 0.239 0.710 6.242 9.028
Monthly total
(million cu m) 10.74 10.38 9.34 5.76 5.05 2.05 0.87 0.70 0.55 0.75 4.86 6.01
Runoff (mm) 85 82 74 46 40 16 7 6 4 6 38 48
Rainfall (mm) 85 110 91 74 81 34 27 53 27 122 102 46
Statistics of monthly data for previous record (Oct 1966 to Dec 1995)
Mean Avg. 4.901 4.062 3.373 2.232 1.587 1.057 0.667 0.619 0.855 1.866 3.059 4.422
flows: Low 1.528 1.369 0.666 0.633 0.355 0.257 0.210 0.112 0.135 0.204 0.662 1.369
(year) 1989 1992 1993 1990 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. 104 78 71 46 34 22 14 13 18 40 63 94
Low 32 27 14 13 8 5 4 2 3 4 14 29
High 191 168 189 103 106 52 81 47 54 147 136 180
Rainfall: Avg. 116 83 84 60 71 63 58 75 90 96 100 114
Low 33 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
1996
For 1996 For record As % of
preceding 1996 pre-1996 $ Natural to within 10% at 95 percentile flow.
Mean flow 1.804 2.386 76
Lowest yearly mean 1.309 1973
Highest yearly mean 3.418 1982
Lowest monthly mean 0.212 Sep 0.112 Aug 1995
Highest monthly mean 4.144 Feb 9.004 Jan 1982
Lowest daily mean 0.173 10 Oct 0.090 28 Sep 1990
Highest daily mean 13.310 12 Feb 39.610 27 Dec 1979
10% exceedance 4.087 5.536 74
50% exceedance 1.201 1.464 82
95% exceedance 0.192 0.268 72
Annual total (million cu m) 57.05 75.29 76
Annual runoff (mm) 451 596 76
Annual rainfall (mm) 852 1010 84
{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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