055013 Arrow at Titley Mill 1997
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 0.714 0.443 4.843 0.705 0.580 0.935 1.941 0.376 0.437 0.261 0.595 5.270
2 0.760 0.434 4.549 0.688 0.561 0.870 1.747 0.356 0.344 0.254 0.586 4.188
3 0.723 0.436 3.756 0.673 0.568 0.849 1.618 0.391 0.429 0.253 0.580 3.421
4 0.686 0.619 4.734 0.642 0.625 0.827 1.381 0.446 0.379 0.247 0.618 2.947
5 0.648 0.518 4.005 0.625 0.915 0.822 1.207 0.555 0.311 0.239 0.750 2.640
6 0.633 0.515 3.550 0.603 0.816 0.857 1.097 0.433 0.280 0.264 0.629 2.384
7 0.589 0.651 3.212 0.579 0.740 0.753 1.032 0.422 0.265 0.400 1.188 2.402
8 0.571 0.593 2.858 0.564 1.384 0.733 0.958 0.338 0.260 0.826 2.414 3.343
9 0.592 0.663 2.906 0.552 1.369 0.676 0.903 0.308 0.248 1.339 3.042 3.451
10 0.543 2.098 2.556 0.531 1.465 1.123 0.866 0.315 0.243 1.124 2.413 4.208
11 0.545 2.218 2.287 0.506 1.881 1.540 0.825 0.313 0.257 3.743 2.032 3.894
12 0.711 4.242 2.098 0.493 1.630 1.097 0.816 0.293 0.252 3.046 1.756 3.255
13 0.660 4.405 1.934 0.488 1.573 0.974 0.820 0.276 0.238 2.199 1.581 2.929
14 0.585 3.449 1.799 0.481 1.392 0.868 0.732 0.262 0.234 1.929 1.440 2.663
15 0.540 2.710 1.649 0.472 1.295 0.834 0.688 0.252 0.234 1.747 1.350 2.390
16 0.542 2.622 1.517 0.465 2.719 0.794 0.662 0.244 0.223 1.537 1.563 2.243
17 0.539 5.876 1.441 0.458 3.135 0.736 0.633 0.242 0.228 1.372 1.530 2.678
18 0.530 6.533 1.418 0.456 2.998 0.722 0.576 0.233 0.352 1.217 4.854 7.222
19 0.598 7.219 1.284 0.448 3.102 0.806 0.542 0.224 0.609 1.134 5.493 4.188
20 0.532 5.832 1.196 0.429 2.938 1.688 0.514 0.227 0.429 1.056 6.518 3.539
21 0.514 5.310 1.116 0.432 2.884 1.347 0.498 0.231 0.334 0.972 4.977 3.076
22 0.556 4.288 1.071 0.422 2.590 1.240 0.474 0.231 0.310 0.935 3.989 3.388
23 0.532 5.736 1.053 0.421 2.273 1.086 0.460 0.243 0.296 0.858 4.164 3.620
24 0.499 13.410 1.046 0.438 1.953 1.107 0.535 0.320 0.284 0.796 4.794 5.144
25 0.478 11.470 0.963 1.072 1.737 2.385 0.459 0.242 0.275 0.763 4.178 5.651
26 0.471 10.790 0.924 1.382 1.570 4.498 0.463 0.224 0.273 0.751 3.787 5.163
27 0.461 7.481 0.878 0.914 1.420 3.591 0.416 0.322 0.271 0.724 3.748 4.650
28 0.444 5.865 0.817 0.770 1.290 3.059 0.394 0.453 0.268 0.670 12.720 4.097
29 0.444 0.776 0.672 1.187 2.540 0.380 0.434 0.268 0.646 9.655 3.750
30 0.447 0.751 0.610 1.089 2.175 0.382 0.527 0.276 0.635 6.544 3.709
31 0.433 0.727 1.013 0.380 0.761 0.610 3.367
Average 0.565 4.158 2.055 0.600 1.635 1.384 0.787 0.338 0.304 1.050 3.316 3.705
Lowest 0.433 0.434 0.727 0.421 0.561 0.676 0.380 0.224 0.223 0.239 0.580 2.243
Highest 0.760 13.410 4.843 1.382 3.135 4.498 1.941 0.761 0.609 3.743 12.720 7.222
Monthly total
(million cu m) 1.51 10.06 5.50 1.55 4.38 3.59 2.11 0.91 0.79 2.81 8.60 9.93
Runoff (mm) 12 80 44 12 35 28 17 7 6 22 68 79
Rainfall (mm) 10 151 32 45 109 133 23 115 42 65 128 89
Statistics of monthly data for previous record (Oct 1966 to Dec 1996)
Mean Avg. 4.872 4.065 3.377 2.232 1.597 1.048 0.655 0.607 0.834 1.815 3.021 4.352
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. 103 78 72 46 34 21 14 13 17 38 62 92
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. 115 84 84 61 71 62 57 74 88 96 100 112
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
1997
For 1997 For record As % of
preceding 1997 pre-1997 $ Natural to within 10% at 95 percentile flow.
Mean flow 1.640 2.367 69
Lowest yearly mean 1.309 1973
Highest yearly mean 3.418 1982
Lowest monthly mean 0.304 Sep 0.112 Aug 1995
Highest monthly mean 4.158 Feb 9.004 Jan 1982
Lowest daily mean 0.223 16 Sep 0.090 28 Sep 1990
Highest daily mean 13.410 24 Feb 39.610 27 Dec 1979
10% exceedance 4.130 5.481 75
50% exceedance 0.808 1.451 56
95% exceedance 0.248 0.257 96
Annual total (million cu m) 51.72 74.70 69
Annual runoff (mm) 409 591 69
Annual rainfall (mm) 942 1004 94
{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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