054007 Arrow at Broom 1997
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 1.039 1.004 1.797 1.015 0.901 0.870 1.366 0.763 3.151 0.812 0.870 4.792
2 1.051 1.006 2.012 1.026 0.894 0.853 1.653 0.744 1.301 0.779 0.911 3.724
3 1.060 0.985 1.632 1.028 0.900 0.838 1.498 0.746 1.186 0.777 0.902 2.544
4 1.040 1.037 1.690 0.998 1.150 0.848 1.386 0.759 1.046 0.773 1.151 2.199
5 1.052 0.998 1.650 1.021 1.782 0.872 1.178 0.795 0.954 0.766 1.150 1.951
6 1.062 0.976 1.607 1.062 1.420 0.945 1.059 0.721 0.887 0.807 1.002 1.848
7 1.042 1.054 1.519 1.019 1.459 0.976 1.030 0.709 0.883 1.018 1.383 1.778
8 1.029 0.983 1.433 0.991 3.498 0.876 0.997 0.702 0.886 2.833 1.915 1.752
9 1.017 0.984 1.401 0.961 3.264 0.849 1.001 0.681 0.845 3.266 1.672 1.925
10 1.014 1.129 1.371 0.897 2.594 1.011 0.929 0.680 0.844 1.615 1.513 2.696
11 1.030 1.174 1.333 0.896 2.030 2.761 0.908 0.666 0.872 4.526 1.303 2.519
12 1.048 1.708 1.309 0.883 1.745 1.905 0.906 0.683 0.872 4.289 1.162 2.059
13 1.063 1.801 1.273 0.893 1.350 2.386 1.128 0.926 0.809 1.843 1.109 1.843
14 1.041 1.449 1.351 0.889 1.190 1.857 0.937 0.732 0.762 1.697 1.074 1.719
15 1.031 1.244 1.228 0.896 1.115 1.736 0.924 0.686 0.770 1.924 1.136 1.555
16 1.037 1.386 1.176 0.887 1.168 1.189 0.876 0.673 0.779 1.637 1.103 1.519
17 1.040 1.917 1.164 0.884 1.274 1.021 1.065 0.675 0.783 1.419 1.311 1.599
18 1.037 4.369 1.189 0.888 1.223 0.951 0.919 0.685 1.108 1.239 2.574 10.430
19 1.098 3.197 1.156 0.901 1.588 1.027 0.820 0.695 1.327 1.152 2.872 5.581
20 1.056 3.252 1.122 0.865 1.311 1.987 0.799 0.764 1.018 1.089 5.923 3.076
21 1.062 2.314 1.115 0.882 1.195 2.104 0.798 0.734 0.888 1.039 3.344 2.498
22 1.267 1.708 1.170 0.878 1.102 1.667 0.787 0.814 0.893 1.012 2.173 2.726
23 1.171 2.173 1.302 0.886 1.058 1.285 0.779 1.177 0.749 0.933 1.778 3.995
24 1.133 4.255 1.301 0.873 0.989 1.087 1.026 2.310 0.774 0.932 2.074 8.517
25 1.104 4.411 1.252 2.207 0.959 2.629 0.933 1.789 0.779 0.902 2.296 13.410
26 1.078 5.384 1.139 1.898 0.962 8.743 0.887 1.125 0.771 0.919 2.675 6.815
27 1.072 2.811 1.067 1.304 0.947 5.760 0.885 1.521 0.767 0.910 2.828 4.290
28 1.062 2.212 1.023 1.078 0.927 2.704 0.764 1.475 0.777 0.891 32.820 3.713
29 1.050 1.007 0.966 0.921 1.835 0.790 1.473 0.807 0.886 26.670 3.194
30 1.004 1.001 0.930 0.916 1.516 0.784 1.585 0.831 0.893 8.090 3.422
31 1.009 0.993 0.900 0.770 4.765 0.868 4.337
Average 1.061 2.033 1.316 1.027 1.378 1.836 0.987 1.073 0.971 1.434 3.893 3.678
Lowest 1.004 0.976 0.993 0.865 0.894 0.838 0.764 0.666 0.749 0.766 0.870 1.519
Highest 1.267 5.384 2.012 2.207 3.498 8.743 1.653 4.765 3.151 4.526 32.820 13.410
Monthly total
(million cu m) 2.84 4.92 3.52 2.66 3.69 4.76 2.64 2.87 2.52 3.84 10.09 9.85
Runoff (mm) 9 15 11 8 12 15 8 9 8 12 32 31
Rainfall (mm) 10 58 14 28 74 114 36 93 27 64 90 60
Statistics of monthly data for previous record (Oct 1957 to Feb 1996----incomplete or missing months total 3.2 years)
Mean Avg. 4.771 4.403 3.688 2.843 2.262 1.660 1.457 1.401 1.644 2.121 2.779 4.152
flows: Low 1.063 0.866 1.015 0.725 0.778 0.542 0.513 0.641 0.609 0.641 0.722 1.055
(year) 1976 1965 1976 1976 1976 1976 1976 1976 1959 1975 1964 1991
High 8.668 13.440 8.843 6.057 6.366 4.412 5.704 3.853 4.711 6.746 8.493 10.330
(year) 1988 1977 1981 1987 1969 1977 1968 1966 1960 1960 1960 1965
Runoff: Avg. 40 34 31 23 19 13 12 12 13 18 23 35
Low 9 7 9 6 7 4 4 5 5 5 6 9
High 73 102 74 49 53 36 48 32 38 57 69 87
Rainfall: Avg. 65 48 52 49 55 54 57 64 64 58 63 68
Low 18 3 5 5 13 10 7 8 3 4 28 13
High 130 134 106 107 136 123 127 135 139 132 146 136
Summary statistics Factors affecting runoff
1997
For 1997 For record As % of $ Reservoir(s) in catchment.
preceding 1997 pre-1997 $ Flow influenced by groundwater abstraction
Mean flow 1.719 2.759 62 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 0.971 Sep 0.513 Jul 1976 $ Augmentation from effluent returns.
Highest monthly mean 3.893 Nov 13.440 Feb 1977
Lowest daily mean 0.666 11 Aug 0.223 21 Aug 1976
Highest daily mean 32.820 28 Nov 68.160 30 Dec 1981
10% exceedance 2.820 5.392 52
50% exceedance 1.075 1.634 66
95% exceedance 0.754 0.755 100
Annual total (million cu m) 54.21 87.07 62
Annual runoff (mm) 170 273 62
Annual rainfall (mm) 668 697 96
{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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