054007 Arrow at Broom 1998
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 4.024 1.848 1.444 3.086 1.966 1.507 1.622 2.326 1.344 1.733 9.949 1.964
2 28.620 1.843 1.467 5.006 1.818 5.466 1.494 1.313 1.116 1.380 11.900 1.883
3 25.330 1.802 2.634 9.105 1.736 2.140 1.434 1.631 1.025 1.214 12.710 1.859
4 18.740 1.773 6.789 5.993 1.794 1.736 1.353 1.232 1.319 1.153 6.124 1.802
5 15.050 1.715 2.740 4.220 1.805 1.596 1.292 1.105 1.998 1.120 3.770 1.810
6 9.770 1.792 8.625 3.621 1.757 1.787 1.299 1.079 1.240 1.104 2.886 1.650
7 12.740 1.865 9.101 2.960 1.689 1.981 1.315 1.052 1.167 1.048 2.782 1.614
8 14.040 1.710 4.733 4.786 1.638 2.260 1.244 1.028 1.617 0.985 12.950 5.800
9 7.476 1.706 2.995 80.600 1.580 1.937 1.158 0.980 1.355 1.154 15.450 4.466
10 5.089 1.658 2.887 37.880 1.610 1.905 1.170 0.945 1.326 1.106 5.182 4.046
11 4.062 1.649 2.724 13.930 1.990 1.754 1.305 0.921 1.501 1.060 3.583 4.205
12 3.506 1.602 2.508 6.933 1.663 1.489 1.315 0.908 1.863 1.006 3.424 7.431
13 4.680 1.588 2.445 4.791 1.596 2.922 1.219 0.910 2.086 0.980 2.718 8.654
14 5.242 1.558 2.227 4.099 1.627 2.354 1.160 1.199 1.296 1.085 3.463 4.637
15 4.677 1.580 2.071 5.068 1.553 1.754 1.123 1.259 1.192 0.995 2.763 5.075
16 4.067 1.591 1.992 4.260 1.481 1.546 1.115 0.994 1.088 1.449 2.740 4.770
17 3.362 1.527 1.910 3.167 1.443 2.357 1.237 0.987 0.999 2.209 2.180 3.734
18 23.900 1.513 1.814 2.728 1.403 2.896 1.096 1.024 0.991 1.375 2.009 3.332
19 8.868 1.490 1.758 2.673 1.373 2.014 1.119 1.057 0.991 1.205 1.881 3.236
20 4.439 1.499 1.731 2.427 1.380 1.646 1.099 1.018 0.974 1.131 1.771 2.811
21 3.605 1.632 1.723 2.467 1.363 1.461 1.091 1.049 0.968 1.132 1.707 2.625
22 3.169 1.440 1.685 2.834 1.331 1.372 1.036 0.999 0.964 2.062 1.668 2.874
23 2.819 1.388 1.690 9.461 1.322 1.510 1.065 1.743 0.956 4.025 1.633 11.690
24 2.541 1.376 1.923 5.677 1.308 1.387 1.024 1.448 0.944 8.944 3.833 6.412
25 2.355 1.371 4.159 4.869 1.437 1.425 1.013 1.153 0.923 4.801 3.169 26.510
26 2.211 1.404 5.541 3.319 1.361 3.320 1.003 1.123 3.112 2.268 2.310 16.350
27 2.161 1.477 3.392 2.765 1.312 5.332 1.073 1.033 2.626 25.120 2.142 8.626
28 2.072 1.528 2.573 2.581 1.280 2.439 1.036 1.004 1.394 37.100 2.805 6.092
29 1.992 4.201 2.332 1.272 2.109 1.072 1.002 1.262 6.784 2.462 4.438
30 1.944 5.235 2.084 1.231 1.876 1.252 0.998 2.939 3.863 2.102 3.585
31 1.894 3.011 1.273 1.582 1.005 12.230 3.279
Average 7.563 1.604 3.217 8.191 1.529 2.176 1.207 1.146 1.419 4.285 4.469 5.395
Lowest 1.894 1.371 1.444 2.084 1.231 1.372 1.003 0.908 0.923 0.980 1.633 1.614
Highest 28.620 1.865 9.101 80.600 1.990 5.466 1.622 2.326 3.112 37.100 15.450 26.510
Monthly total
(million cu m) 20.26 3.88 8.62 21.23 4.10 5.64 3.23 3.07 3.68 11.48 11.58 14.45
Runoff (mm) 64 12 27 67 13 18 10 10 12 36 36 45
Rainfall (mm) 81 9 74 112 15 119 32 39 88 122 57 70
Statistics of monthly data for previous record (Oct 1957 to Dec 1997----incomplete or missing months total 4.0 years)
Mean Avg. 4.671 4.339 3.622 2.792 2.237 1.665 1.444 1.392 1.625 2.103 2.809 4.139
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 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. 39 33 30 23 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 49 53 36 48 32 38 57 69 87
Rainfall: Avg. 63 48 51 48 56 56 56 65 63 58 63 67
Low 10 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
1998
For 1998 For record As % of $ Reservoir(s) in catchment.
preceding 1998 pre-1998 $ Flow influenced by groundwater abstraction
Mean flow 3.526 2.730 129 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 1.146 Aug 0.513 Jul 1976 $ Augmentation from effluent returns.
Highest monthly mean 8.191 Apr 13.440 Feb 1977
Lowest daily mean 0.908 12 Aug 0.223 21 Aug 1976
Highest daily mean 80.600 9 Apr 68.160 30 Dec 1981
10% exceedance 6.222 5.305 117
50% exceedance 1.790 1.614 111
95% exceedance 0.999 0.762 131
Annual total (million cu m) 111.20 86.15 129
Annual runoff (mm) 349 270 129
Annual rainfall (mm) 818 694 118
{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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