054007 Arrow at Broom 1999
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 3.281 3.671 4.112 2.316 2.421 2.102 1.289 1.185 1.033 8.801 1.805 1.718
2 6.718 3.345 10.250 2.501 2.262 16.930 1.356 1.099 0.999 24.960 1.694 1.615
3 16.540 3.363 28.000 2.238 2.136 12.190 1.288 1.188 0.997 5.376 1.619 1.740
4 15.720 3.020 11.500 2.148 2.033 6.438 1.268 1.091 0.971 2.833 1.565 1.702
5 6.601 2.759 6.395 2.108 2.007 3.665 1.287 1.497 0.941 1.928 8.740 1.499
6 14.020 2.848 8.338 2.270 1.922 2.715 1.631 1.366 0.989 1.656 5.776 1.781
7 13.480 2.746 7.586 2.163 2.760 3.222 1.395 2.682 0.978 1.584 3.179 2.386
8 8.247 2.865 5.773 2.065 2.788 2.601 1.232 2.987 1.102 1.522 2.450 2.238
9 4.911 2.540 4.890 2.030 2.326 1.777 1.186 3.202 1.035 1.428 1.989 2.164
10 3.955 2.340 4.028 1.970 2.308 1.707 1.168 1.525 0.926 1.453 1.814 2.344
11 3.367 2.108 3.165 2.302 2.175 1.698 1.101 1.223 0.920 1.300 1.778 22.280
12 3.892 2.248 5.090 2.862 1.968 2.653 1.078 1.200 0.930 1.278 2.024 8.083
13 5.493 2.340 6.209 2.368 1.865 1.938 1.124 1.153 0.916 1.266 1.877 12.050
14 4.957 2.282 3.768 2.133 2.004 1.711 1.079 1.132 0.890 1.228 1.737 6.945
15 13.940 2.274 3.209 2.536 1.788 1.629 1.005 1.067 0.909 1.201 1.676 4.046
16 41.370 2.276 2.778 3.003 1.714 1.504 0.997 1.838 1.175 1.185 1.654 3.445
17 8.706 2.614 2.638 3.234 1.650 1.423 0.982 1.394 1.110 1.169 1.620 3.970
18 6.101 2.890 2.531 2.624 1.665 1.407 0.988 1.283 1.024 1.145 1.685 3.156
19 9.592 2.837 2.378 2.279 2.606 1.427 1.075 1.140 2.397 1.204 1.589 2.621
20 19.280 2.495 2.293 7.769 2.830 1.540 1.185 1.065 5.276 1.307 1.504 2.275
21 7.189 3.045 3.091 6.058 1.839 1.429 0.981 0.990 2.595 2.253 1.470 3.768
22 5.270 6.438 2.570 3.897 1.721 1.382 0.982 0.989 1.568 2.023 1.537 6.619
23 4.405 4.945 2.394 30.780 1.612 1.584 0.980 0.983 2.104 2.088 1.466 8.652
24 3.890 5.579 2.317 10.480 1.674 1.362 0.941 1.375 1.924 6.198 1.570 28.140
25 7.808 3.652 3.665 5.261 1.586 1.324 0.927 2.382 1.665 8.332 2.166 22.820
26 11.570 15.070 3.366 23.610 1.546 1.316 0.894 1.611 2.000 3.405 2.353 13.100
27 7.434 8.916 2.702 8.995 1.990 1.830 0.895 1.222 3.028 2.277 1.777 7.196
28 7.418 4.574 2.422 4.396 1.857 1.511 0.878 1.111 2.332 1.962 1.901 4.806
29 4.986 2.577 3.072 4.758 1.378 0.861 1.093 2.183 1.862 2.146 3.556
30 4.715 2.504 2.733 3.551 1.263 0.848 1.065 1.983 1.867 1.814 12.110
31 4.054 2.414 2.319 0.856 1.056 1.746 8.694
Average 8.997 3.789 4.998 5.073 2.183 2.822 1.089 1.426 1.563 3.156 2.199 6.694
Lowest 3.281 2.108 2.293 1.970 1.546 1.263 0.848 0.983 0.890 1.145 1.466 1.499
Highest 41.370 15.070 28.000 30.780 4.758 16.930 1.631 3.202 5.276 24.960 8.740 28.140
Monthly total
(million cu m) 24.10 9.16 13.39 13.15 5.85 7.31 2.92 3.82 4.05 8.45 5.70 17.93
Runoff (mm) 76 29 42 41 18 23 9 12 13 27 18 56
Rainfall (mm) 109 45 61 84 68 66 6 101 85 77 44 111
Statistics of monthly data for previous record (Oct 1957 to Dec 1998----incomplete or missing months total 4.0 years)
Mean Avg. 4.747 4.267 3.611 2.938 2.218 1.679 1.438 1.385 1.619 2.160 2.853 4.172
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 8.668 13.440 8.843 8.191 6.366 4.412 5.704 3.853 4.711 6.746 8.493 10.330
(year) 1988 1977 1981 1998 1969 1977 1968 1966 1960 1960 1960 1965
Runoff: Avg. 40 33 30 24 19 14 12 12 13 18 23 35
Low 9 7 9 6 7 4 4 5 5 5 6 9
High 73 102 74 67 53 36 48 32 38 57 69 87
Rainfall: Avg. 64 47 52 50 55 57 55 64 63 60 63 67
Low 10 3 5 5 13 10 7 8 3 4 28 13
High 130 134 106 112 136 123 127 135 139 132 146 136
Summary statistics Factors affecting runoff
1999
For 1999 For record As % of $ Reservoir(s) in catchment.
preceding 1999 pre-1999 $ Flow influenced by groundwater abstraction
Mean flow 3.673 2.751 134 and/or recharge.
Lowest yearly mean 1.446 1964 $ Flow reduced by industrial and/or
Highest yearly mean 4.208 1966 agricultural abstractions.
Lowest monthly mean 1.089 Jul 0.513 Jul 1976 $ Augmentation from effluent returns.
Highest monthly mean 8.997 Jan 13.440 Feb 1977
Lowest daily mean 0.848 30 Jul 0.223 21 Aug 1976
Highest daily mean 41.370 16 Jan 80.600 9 Apr 1998
10% exceedance 7.942 5.322 149
50% exceedance 2.168 1.625 133
95% exceedance 0.976 0.768 127
Annual total (million cu m) 115.80 86.81 133
Annual runoff (mm) 363 272 133
Annual rainfall (mm) 857 697 123
{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.
In line with Natural Environment Research Council policy, the provision of data from the National River Flow Archive confers only a right to use the data. Ownership of the data, or the associated Intellectual Property Rights, will not normally be transferred. Data received from the NRFA must not be sold, or passed on to any third party. Reproduction is authorised, except for commercial purposes, provided the sources is acknowledged.
Through the use of quality control procedures every effort is made to maintain and improve the quality of data. However, NERC, the Environment Agency, the Scottish Environment Protection Agency and the Rivers Agency accepts no liability for any loss or damage, cost or claims arising directly or indirectly their use.