078003 Annan at Brydekirk 2001
Measuring authority: SEPA Grid reference: 35 (NY) 191 704 Catchment area (sq km): 925.0
First year: 1967 Level stn. (m OD): 10.00 Max alt. (m OD): 821
Daily mean gauged discharges (cubic metres per second)
DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1 98.590 20.530 13.830 20.540 18.440 5.348 7.471 4.790 5.475 123.700 24.550 59.530
2 108.400 25.320 11.680 22.370 15.390 5.425 6.092 4.308 6.109 53.340 21.530 41.400
3 64.930 35.730 10.560 20.160 13.370 5.144 5.445 4.131 5.754 34.920 19.550 64.240
4 82.880 30.170 9.721 16.020 11.670 4.670 5.251 5.283 5.087 32.670 18.160 97.400
5 46.560 37.350 12.290 14.540 10.570 4.374 4.772 4.717 4.823 114.100 20.780 126.200
6 49.920 166.000 22.200 42.450 9.635 4.647 4.298 4.148 4.608 130.400 25.520 70.610
7 57.670 94.590 69.170 43.480 8.816 4.885 4.228 4.663 4.471 168.400 21.930 79.310
8 41.830 47.270 51.080 24.720 8.269 4.631 4.344 8.935 4.452 180.700 27.300 58.310
9 33.730 34.680 52.890 24.800 7.794 6.124 4.120 6.138 4.240 87.820 19.710 43.100
10 28.680 71.860 45.530 31.400 7.342 6.611 6.793 4.726 4.073 57.060 17.930 34.930
11 25.120 90.860 54.230 21.550 6.886 5.057 9.512 4.535 4.011 42.090 17.350 29.530
12 22.690 46.770 47.360 18.290 6.602 4.576 11.520 6.692 5.028 46.950 24.630 25.810
13 20.380 35.690 31.340 16.110 6.356 4.334 15.160 9.198 16.540 35.060 19.180 23.040
14 18.240 30.330 25.320 14.700 6.133 4.286 27.990 12.060 10.640 39.630 17.190 20.910
15 16.800 26.330 21.850 13.350 6.355 4.512 22.750 13.340 7.292 64.530 15.420 19.010
16 14.510 23.230 19.090 11.590 7.440 5.015 13.730 17.900 5.979 43.780 13.950 17.420
17 13.630 20.660 17.070 11.230 7.908 4.916 9.427 12.920 5.444 34.260 12.780 15.780
18 12.750 19.020 15.100 11.960 8.066 4.372 7.607 8.260 4.991 73.890 11.910 14.410
19 11.730 17.940 13.440 10.170 6.892 4.398 6.510 29.630 4.711 44.090 12.240 13.240
20 11.080 16.460 12.250 9.202 6.335 11.130 6.094 40.590 4.584 39.520 12.360 12.290
21 10.680 15.740 11.270 9.089 5.977 7.310 6.054 18.270 4.609 62.650 45.790 13.260
22 14.310 14.420 10.650 34.030 5.638 5.410 6.971 13.850 4.544 70.290 31.750 12.140
23 61.050 12.950 10.870 43.700 5.373 4.723 6.506 10.240 4.330 79.360 21.350 10.550
24 53.200 11.610 10.510 23.490 5.158 4.334 6.042 8.520 4.190 83.060 20.240 13.600
25 41.260 10.860 9.618 23.440 4.993 4.110 5.620 7.968 4.208 67.940 27.770 13.930
26 39.590 14.540 8.853 23.800 4.919 10.030 5.104 7.723 4.278 82.260 23.060 10.420
27 28.480 16.300 9.224 20.840 4.922 12.210 4.753 6.536 4.975 61.760 73.380 14.650
28 23.330 16.300 16.600 24.170 5.071 8.041 4.509 5.949 8.481 43.020 54.400 27.320
29 20.490 13.360 28.990 4.935 8.112 4.342 5.601 25.190 35.130 72.220 15.660
30 22.020 11.400 24.870 5.250 8.603 4.376 6.537 73.410 32.320 87.020 11.680
31 21.140 33.790 6.062 5.588 6.617 31.620 11.750
Average 35.990 35.840 22.650 21.840 7.696 5.911 7.838 9.831 8.551 67.620 27.700 32.950
Lowest 10.680 10.860 8.853 9.089 4.919 4.110 4.120 4.131 4.011 31.620 11.910 10.420
Highest 108.400 166.000 69.170 43.700 18.440 12.210 27.990 40.590 73.410 180.700 87.020 126.200
Monthly total
(million cu m) 96.39 86.70 60.67 56.60 20.61 15.32 20.99 26.33 22.16 181.10 71.79 88.25
Runoff (mm) 104 94 66 61 22 17 23 28 24 196 78 95
Rainfall (mm) 85 100 69 87 36 80 87 91 99 211 98 80
Statistics of monthly data for previous record (Oct 1967 to Dec 2000)
Mean Avg. 48.120 40.620 35.240 22.990 15.580 11.740 11.090 17.020 23.840 37.470 43.450 48.670
flows: Low 12.920 12.830 8.404 6.123 3.521 2.937 1.945 2.007 3.264 3.592 11.490 15.220
(year) 1997 1986 1969 1974 1980 1978 1984 1984 1996 1972 1983 1995
High 83.440 105.700 63.910 52.350 53.160 32.150 34.940 76.390 76.330 86.820 77.930 87.030
(year) 1975 1990 1989 1993 1986 1972 1985 1985 1985 1967 1982 1986
Runoff: Avg. 139 107 102 64 45 33 32 49 67 108 122 141
Low 37 34 24 17 10 8 6 6 9 10 32 44
High 242 277 185 147 154 90 101 221 214 251 218 252
Rainfall: Avg. 147 109 120 78 84 83 94 108 125 150 139 151
Low 26 9 41 11 14 21 39 21 18 49 29 43
High 282 290 198 156 212 153 229 291 238 277 234 282
Summary statistics Factors affecting runoff
2001
For 2001 For record As % of
preceding 2001 pre-2001 $ Natural to within 10% at 95 percentile flow.
Mean flow 23.690 29.610 80
Lowest yearly mean 16.400 1973
Highest yearly mean 39.200 1998
Lowest monthly mean 5.911 Jun 1.945 Jul 1984
Highest monthly mean 67.620 Oct 105.700 Feb 1990
Lowest daily mean 4.011 11 Sep 1.345 23 Jul 1984
Highest daily mean 180.700 8 Oct 410.300 31 Oct 1977
10% exceedance 57.800 69.820 83
50% exceedance 13.720 17.570 78
95% exceedance 4.362 3.462 126
Annual total (million cu m) 747.10 934.50 80
Annual runoff (mm) 808 1010 80
Annual rainfall (mm) 1123 1388 81
{1961-90 rainfall average (mm) 1351}
Station and catchment description
Velocity-area station with cableway located on straight section below bend and with slightly curving channel below.
Silurain shales in the north; Carboniferous series in the south. Centre of catchment is dominated by Triassic sandstone
aquifer of the Lochmaben basin, with a smaller ribbon aquifer extending up the valley to Moffat. Natural agricultural
catchment.
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.