054007 Arrow at Broom 2001
Measuring authority: EA Grid reference: 42 (SP) 086 536 Catchment area (sq km): 319.0
First year: 1957 Level stn. (m OD): 29.80 Max alt. (m OD): 291
Daily mean gauged discharges (cubic metres per second)
DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1 30.710 4.655 3.219 3.460 2.653 1.633 1.492 1.280 1.211 2.902 2.056 13.580
2 26.160 9.181 2.879 3.678 2.517 1.770 1.439 1.419 1.870 1.799 1.850 4.949
3 10.030 16.680 2.625 13.890 2.532 1.660 1.413 1.393 1.434 1.372 1.731 3.623
4 6.882 37.740 2.488 23.700 2.346 1.624 1.361 1.350 1.320 1.223 1.638 4.852
5 5.137 14.520 2.301 26.890 2.202 1.604 1.293 1.294 1.330 1.341 1.533 6.528
6 4.042 25.850 4.662 11.550 2.107 1.634 3.821 1.361 1.251 1.263 1.532 3.664
7 3.562 9.950 6.041 9.772 2.070 1.644 9.510 1.557 1.150 1.846 2.282 2.823
8 3.230 6.090 3.674 18.560 2.066 1.594 5.893 1.600 1.130 2.544 2.595 2.391
9 2.993 4.174 3.735 12.770 2.110 1.543 2.152 1.667 1.135 2.092 1.816 2.206
10 2.666 3.754 5.579 8.339 2.889 1.513 2.032 1.226 1.117 1.496 1.706 2.072
11 2.509 3.850 5.212 5.950 2.207 1.597 1.646 1.242 1.126 1.351 1.649 1.942
12 2.392 41.320 6.506 4.258 2.046 1.387 1.602 2.024 1.328 1.285 2.629 1.937
13 2.406 10.200 9.873 3.731 3.611 1.487 2.308 1.475 1.492 1.256 2.202 1.828
14 2.376 5.752 4.421 3.467 3.405 1.539 1.724 1.320 1.312 1.266 1.747 1.771
15 2.335 4.538 3.477 3.463 6.018 3.414 1.419 1.263 1.180 4.472 1.645 1.658
16 2.309 3.796 5.627 3.157 6.097 4.425 1.416 2.732 1.111 2.661 1.614 1.674
17 2.214 3.300 27.760 3.321 21.190 2.245 6.140 1.535 1.095 1.731 1.557 1.691
18 2.132 3.002 8.903 3.249 5.974 1.848 30.530 1.451 1.090 1.970 1.524 1.651
19 2.109 2.897 5.885 2.837 3.690 1.631 5.826 2.348 1.138 1.915 1.474 1.650
20 2.059 2.781 4.607 2.632 2.979 1.530 3.622 1.530 1.216 3.077 1.438 1.664
21 2.846 2.820 12.980 2.500 2.543 1.467 3.278 1.314 1.158 3.648 1.456 1.709
22 5.902 2.848 11.240 11.370 2.362 1.439 2.201 1.203 1.144 5.142 1.714 1.632
23 29.160 2.700 18.230 9.220 2.246 1.421 1.884 1.239 1.116 8.721 1.496 1.564
24 17.220 2.523 9.661 13.270 2.109 1.388 1.708 1.222 1.328 3.660 1.473 1.608
25 6.809 2.460 5.910 13.800 2.046 1.381 1.591 1.175 1.190 2.649 3.874 1.791
26 4.930 3.153 4.440 7.544 1.971 1.364 1.473 1.155 1.200 13.920 3.265 1.611
27 3.762 3.979 6.023 4.576 1.958 1.372 1.422 1.138 1.172 5.712 2.679 1.639
28 2.834 4.043 16.270 3.929 1.852 1.425 1.351 1.131 1.129 3.564 2.834 1.662
29 2.674 7.250 3.472 1.781 2.026 1.319 1.133 1.260 2.590 4.679 1.715
30 3.658 5.164 2.918 1.737 1.871 1.301 1.188 1.423 2.442 6.336 1.640
31 3.968 3.985 1.664 1.268 1.298 2.511 1.505
Average 6.517 8.520 7.117 8.042 3.322 1.749 3.401 1.428 1.239 3.014 2.201 2.653
Lowest 2.059 2.460 2.301 2.500 1.664 1.364 1.268 1.131 1.090 1.223 1.438 1.505
Highest 30.710 41.320 27.760 26.890 21.190 4.425 30.530 2.732 1.870 13.920 6.336 13.580
Monthly total
(million cu m) 17.45 20.61 19.06 20.85 8.90 4.53 9.11 3.82 3.21 8.07 5.70 7.11
Runoff (mm) 55 65 60 65 28 14 29 12 10 25 18 22
Rainfall (mm) 43 77 79 98 48 48 101 47 44 97 51 20
Statistics of monthly data for previous record (Oct 1957 to Dec 2000----incomplete or missing months total 4.0 years)
Mean Avg. 4.814 4.246 3.619 3.116 2.234 1.705 1.425 1.381 1.640 2.305 3.016 4.367
flows: Low 1.061 0.866 1.015 0.725 0.778 0.542 0.513 0.641 0.609 0.641 0.722 1.055
(year) 1997 1965 1976 1976 1976 1976 1976 1976 1959 1975 1964 1991
High 8.997 13.440 8.843 8.191 6.366 4.412 5.704 3.853 4.711 6.977 10.020 10.330
(year) 1999 1977 1981 1998 1969 1977 1968 1966 1960 2000 2000 1965
Runoff: Avg. 40 32 30 25 19 14 12 12 13 19 25 37
Low 9 7 9 6 7 4 4 5 5 5 6 9
High 76 102 74 67 53 36 48 32 38 59 81 87
Rainfall: Avg. 64 48 51 53 56 57 54 65 65 62 64 69
Low 10 3 5 5 13 10 6 8 3 4 28 13
High 130 134 106 131 136 123 127 135 139 132 146 136
Summary statistics Factors affecting runoff
2001
For 2001 For record As % of $ Reservoir(s) in catchment.
preceding 2001 pre-2001 $ Flow influenced by groundwater abstraction
Mean flow 4.072 2.816 145 and/or recharge.
Lowest yearly mean 1.446 1964 $ Flow reduced by industrial and/or
Highest yearly mean 4.423 2000 agricultural abstractions.
Lowest monthly mean 1.239 Sep 0.513 Jul 1976 $ Augmentation from effluent returns.
Highest monthly mean 8.520 Feb 13.440 Feb 1977
Lowest daily mean 1.090 18 Sep 0.223 21 Aug 1976
Highest daily mean 41.320 12 Feb 80.600 9 Apr 1998
10% exceedance 9.011 5.501 164
50% exceedance 2.208 1.648 134
95% exceedance 1.176 0.760 155
Annual total (million cu m) 128.40 88.87 144
Annual runoff (mm) 403 279 144
Annual rainfall (mm) 753 708 106
{1961-90 rainfall average (mm) 688}
Station and catchment description
Up to 1976 rated section; not rated above bankfull when extensive inundation. Replaced in 1976 with a Crump profile weir,
12m wide with a higher flow capacity. Gw pumping for PWS significantly augments low flow through effluent returns.
Contains Redditch and Alcester.
Low relief, predominantly agricultural catchment upon Mercia Mudstone, with small glacial gravel deposits in the eastern
headwaters. Responsive; sewage effluent maintains low flows.
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