054007 Arrow at Broom 1996
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 2.812 1.541
2 3.245 1.514
3 3.288 1.474
4 3.293 1.450
5 3.424 1.469
6 4.749 1.621
7 6.155 1.588
8 6.704 1.533
9 11.450 6.110
10 5.474 5.632
11 4.419 4.514
12 5.169 15.460
13 4.361 8.257
14 3.117 4.383
15 2.511 3.408
16 2.275 2.746
17 2.140 2.444
18 2.022 2.640
19 1.930 2.330
20 1.864 2.064
21 1.837 2.027
22 1.735 2.100
23 2.034 2.524
24 2.135 5.077
25 1.982 7.569
26 1.736 5.842
27 1.695 3.545
28 1.647 2.758
29 1.585 2.424
30 1.542
31 1.546
Average 3.222 3.657
Lowest 1.542 1.450
Highest 11.450 15.460
Monthly total
(million cu m) 8.63 9.16
Runoff (mm) 27 29
Rainfall (mm) 39 56 26 46 40 26 36 65 16 58 64 42
Statistics of monthly data for previous record (Oct 1957 to Dec 1995----incomplete or missing months total 3.2 years)
Mean Avg. 4.815 4.424 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 53 49 56 55 57 64 65 58 62 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
1996
For 1996 For record As % of $ Reservoir(s) in catchment.
preceding 1996 pre-1996 $ Flow influenced by groundwater abstraction
Mean flow 2.764 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 3.222 Jan 0.513 Jul 1976 $ Augmentation from effluent returns.
Highest monthly mean 3.657 Feb 13.440 Feb 1977
Lowest daily mean 1.450 4 Feb 0.223 21 Aug 1976
Highest daily mean 15.460 12 Feb 68.160 30 Dec 1981
10% exceedance 5.392
50% exceedance 1.634
95% exceedance 0.755
Annual total (million cu m) 87.22
Annual runoff (mm) 273
Annual rainfall (mm) 514 700 73
{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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