078003 Annan at Brydekirk 1997
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 12.590 8.206 102.300 19.390 8.495 6.231 8.074 17.530 11.520 7.026 7.928 21.380
2 11.840 9.193 140.700 17.440 7.444 5.947 9.561 11.530 15.590 6.512 7.511 19.040
3 11.320 59.790 67.560 16.610 7.227 5.727 10.840 8.274 171.600 6.176 7.153 17.260
4 10.670 85.710 49.780 16.060 92.850 5.498 12.220 6.624 68.240 5.976 6.829 16.000
5 10.050 38.050 46.420 19.010 91.860 5.325 8.135 5.809 39.630 5.825 19.210 19.940
6 9.596 36.940 38.590 16.050 42.560 5.396 6.809 5.313 28.030 6.281 39.940 67.490
7 9.376 37.680 39.190 14.890 29.730 5.530 6.290 4.928 23.340 9.026 19.630 50.740
8 8.999 28.840 40.650 13.490 27.820 5.996 5.844 4.643 18.050 8.225 43.130 133.700
9 8.559 54.040 30.840 11.860 22.500 5.731 5.362 4.664 14.580 15.810 31.900 96.070
10 8.253 157.400 26.840 10.650 22.000 5.115 4.950 4.630 12.140 33.800 27.930 116.100
11 11.210 70.230 24.150 9.766 63.400 5.661 4.711 4.387 11.010 16.570 25.280 141.600
12 31.910 106.500 22.230 9.166 55.680 7.070 4.630 4.250 11.540 11.260 25.100 70.680
13 27.630 71.850 23.040 8.725 51.320 9.553 5.853 6.532 10.360 9.103 20.100 53.130
14 20.960 49.050 25.830 8.382 36.220 13.410 5.549 8.444 9.918 9.146 20.020 42.100
15 17.830 38.510 25.680 8.018 27.580 8.973 4.919 5.546 19.470 18.770 23.870 34.610
16 15.940 74.160 29.120 7.586 22.750 7.978 5.619 4.971 140.300 68.150 95.710 29.520
17 14.920 247.100 25.340 7.255 22.670 6.520 5.261 4.737 67.440 101.300 61.290 25.690
18 16.710 164.900 35.360 7.064 19.890 6.090 4.589 4.519 35.510 49.050 252.500 38.510
19 15.550 223.200 32.830 6.777 17.780 31.000 4.246 4.302 25.460 32.150 111.300 39.710
20 13.180 229.600 24.520 6.446 30.780 27.780 3.990 4.288 20.190 24.070 106.100 38.870
21 11.990 145.400 20.890 6.282 21.120 20.790 3.806 5.728 16.840 19.580 96.860 31.180
22 11.380 87.630 24.120 6.166 16.030 14.670 3.686 6.355 14.340 16.620 55.180 28.180
23 10.520 136.700 42.680 6.132 13.580 11.150 3.714 5.089 12.470 14.380 44.630 41.070
24 10.740 102.900 33.820 13.460 12.060 9.039 4.565 4.858 11.060 12.630 65.710 110.000
25 12.170 75.400 28.120 9.139 10.930 8.496 5.741 4.616 9.963 11.450 51.500 162.100
26 11.450 65.510 51.140 7.226 10.140 7.798 5.323 7.027 9.159 10.520 38.740 103.500
27 10.320 101.700 47.910 6.748 9.320 6.914 5.383 6.450 8.642 9.706 32.940 61.260
28 9.384 110.400 40.300 18.200 8.507 6.589 5.160 6.819 8.113 8.886 29.920 56.700
29 8.777 30.090 16.300 7.843 6.095 5.142 5.550 8.287 8.224 30.620 43.350
30 8.539 25.300 10.380 7.204 5.713 12.760 5.869 7.461 8.174 24.910 94.060
31 8.234 21.990 6.682 16.750 5.286 8.460 109.700
Average 12.920 93.450 39.270 11.160 26.580 9.260 6.435 6.115 28.680 18.480 47.450 61.720
Lowest 8.234 8.206 20.890 6.132 6.682 5.115 3.686 4.250 7.461 5.825 6.829 16.000
Highest 31.910 247.100 140.700 19.390 92.850 31.000 16.750 17.530 171.600 101.300 252.500 162.100
Monthly total
(million cu m) 34.61 226.10 105.20 28.92 71.19 24.00 17.24 16.38 74.33 49.49 123.00 165.30
Runoff (mm) 37 244 114 31 77 26 19 18 80 54 133 179
Rainfall (mm) 26 290 92 41 121 102 94 68 128 84 159 193
Statistics of monthly data for previous record (Oct 1967 to Dec 1996)
Mean Avg. 48.270 38.400 35.240 22.930 15.250 11.170 10.610 16.920 22.700 37.110 42.150 45.750
flows: Low 17.820 12.830 8.404 6.123 3.521 2.937 1.945 2.007 3.264 3.592 11.490 15.220
(year) 1985 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. 140 102 102 64 44 31 31 49 64 107 118 132
Low 52 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. 149 102 123 76 82 80 93 108 123 151 135 144
Low 60 9 41 11 14 21 39 21 18 49 29 43
High 282 289 198 156 212 153 229 291 238 277 234 282
Summary statistics Factors affecting runoff
1997
For 1997 For record As % of
preceding 1997 pre-1997 $ Natural to within 10% at 95 percentile flow.
Mean flow 29.670 28.850 103
Lowest yearly mean 16.400 1973
Highest yearly mean 36.420 1986
Lowest monthly mean 6.115 Aug 1.945 Jul 1984
Highest monthly mean 93.450 Feb 105.700 Feb 1990
Lowest daily mean 3.686 22 Jul 1.345 23 Jul 1984
Highest daily mean 252.500 18 Nov 410.300 31 Oct 1977
10% exceedance 71.990 68.550 105
50% exceedance 14.450 16.990 85
95% exceedance 4.772 3.302 145
Annual total (million cu m) 935.70 910.50 103
Annual runoff (mm) 1012 984 103
Annual rainfall (mm) 1398 1366 102
{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.