054007 Arrow at Broom 2000
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 6.106 2.198 7.541 1.758 2.819 2.807 1.412 1.034 1.319 2.052 5.899 6.418
2 4.255 2.031 4.839 3.238 2.571 2.098 1.336 1.308 1.245 1.861 27.090 4.783
3 5.354 2.051 8.523 25.860 2.412 2.148 1.364 1.412 1.085 1.586 15.960 3.828
4 5.936 2.107 4.221 11.410 2.202 2.039 1.401 1.270 1.059 1.445 5.867 8.610
5 4.231 1.990 3.074 4.628 2.181 1.833 1.334 1.094 1.110 1.574 19.860 10.720
6 4.251 1.934 2.889 2.941 2.101 1.759 1.484 1.057 1.174 1.432 34.630 15.350
7 3.577 1.991 2.607 2.505 1.996 1.664 1.583 1.196 1.090 5.067 11.030 27.890
8 2.996 2.133 2.394 2.249 1.944 1.623 1.380 1.128 1.156 3.226 7.421 32.750
9 2.692 1.846 2.287 2.089 1.904 2.003 1.595 1.098 1.113 6.506 6.059 8.752
10 2.503 2.361 2.173 1.963 1.835 1.608 1.613 1.044 1.091 15.090 4.318 10.740
11 2.458 1.983 2.080 3.356 1.761 1.535 1.581 0.942 1.055 36.140 9.122 18.710
12 3.352 2.438 1.954 6.505 1.750 1.464 1.405 0.991 1.080 6.812 6.034 24.240
13 8.077 2.060 1.989 8.411 1.683 1.434 1.375 1.068 1.095 3.617 3.898 21.850
14 3.982 2.967 1.924 3.964 1.595 1.542 1.207 1.111 2.877 2.586 3.371 8.652
15 3.320 3.773 1.851 3.425 1.564 1.465 1.176 1.060 5.014 2.278 3.166 6.084
16 2.910 3.867 1.819 3.614 1.531 1.308 1.171 1.155 1.583 2.054 5.209 4.785
17 2.641 3.373 1.796 5.957 1.719 1.320 1.172 1.376 1.343 1.887 3.454 3.998
18 2.488 3.570 1.783 28.570 1.795 1.256 1.141 1.859 2.130 1.940 3.089 3.591
19 2.348 2.630 1.761 22.810 1.636 1.247 1.116 1.624 3.942 1.758 6.680 4.109
20 2.242 2.392 1.763 12.220 2.095 1.279 1.112 1.214 4.765 2.539 4.626 4.120
21 2.150 2.287 1.771 6.891 2.654 1.320 1.085 1.154 2.148 4.066 9.752 3.399
22 2.265 2.084 1.690 7.629 1.761 1.466 1.069 1.023 1.980 2.511 17.720 3.126
23 2.088 2.011 2.577 6.619 2.104 1.326 1.088 0.984 1.567 2.354 8.272 2.959
24 2.075 2.671 1.988 5.768 2.104 1.267 1.118 0.974 2.635 2.231 5.799 14.200
25 2.058 2.718 1.823 8.086 1.971 1.248 1.092 1.010 6.394 2.109 17.400 9.724
26 1.960 2.333 1.749 14.940 3.897 1.242 1.067 2.090 8.761 2.029 10.490 5.005
27 1.911 13.200 1.677 9.655 8.246 1.221 1.033 1.311 4.113 2.683 14.550 3.917
28 1.939 20.670 1.604 5.265 16.660 1.197 1.392 1.209 5.270 6.539 17.630 3.407
29 2.318 16.030 1.596 5.784 4.710 1.241 1.324 1.089 2.716 23.640 7.171 2.951
30 2.010 1.580 3.509 2.915 1.367 1.267 1.057 2.348 55.270 5.050 2.638
31 1.797 1.590 2.658 1.086 1.329 11.390 11.750
Average 3.171 3.921 2.546 7.721 2.864 1.544 1.277 1.202 2.475 6.977 10.020 9.453
Lowest 1.797 1.846 1.580 1.758 1.531 1.197 1.033 0.942 1.055 1.432 3.089 2.638
Highest 8.077 20.670 8.523 28.570 16.660 2.807 1.613 2.090 8.761 55.270 34.630 32.750
Monthly total
(million cu m) 8.49 9.82 6.82 20.01 7.67 4.00 3.42 3.22 6.42 18.69 25.97 25.32
Runoff (mm) 27 31 21 63 24 13 11 10 20 59 81 79
Rainfall (mm) 26 65 19 131 79 23 38 58 120 129 114 107
Statistics of monthly data for previous record (Oct 1957 to Dec 1999----incomplete or missing months total 4.0 years)
Mean Avg. 4.856 4.254 3.648 2.994 2.217 1.709 1.429 1.386 1.617 2.186 2.836 4.237
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 6.746 8.493 10.330
(year) 1999 1977 1981 1998 1969 1977 1968 1966 1960 1960 1960 1965
Runoff: Avg. 41 33 31 24 19 14 12 12 13 18 23 36
Low 9 7 9 6 7 4 4 5 5 5 6 9
High 76 102 74 67 53 36 48 32 38 57 69 87
Rainfall: Avg. 65 47 52 51 55 58 54 65 64 60 63 68
Low 10 3 5 5 13 10 6 8 3 4 28 13
High 130 134 106 112 136 123 127 135 139 132 146 136
Summary statistics Factors affecting runoff
2000
For 2000 For record As % of $ Reservoir(s) in catchment.
preceding 2000 pre-2000 $ Flow influenced by groundwater abstraction
Mean flow 4.423 2.775 159 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 1.202 Aug 0.513 Jul 1976 $ Augmentation from effluent returns.
Highest monthly mean 10.020 Nov 13.440 Feb 1977
Lowest daily mean 0.942 11 Aug 0.223 21 Aug 1976
Highest daily mean 55.270 30 Oct 80.600 9 Apr 1998
10% exceedance 9.808 5.404 181
50% exceedance 2.146 1.641 131
95% exceedance 1.079 0.762 142
Annual total (million cu m) 139.90 87.57 160
Annual runoff (mm) 438 275 160
Annual rainfall (mm) 909 702 129
{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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