078003 Annan at Brydekirk 1998
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
1 114.900 17.920 28.870 25.190 18.680 10.550 19.630 43.280 47.580 8.262 38.940 43.340
2 101.900 16.210 71.880 23.490 16.500 8.668 16.510 28.580 30.380 7.587 94.070 36.790
3 128.100 14.230 88.370 53.740 14.690 17.210 14.090 116.300 18.860 6.814 104.200 31.610
4 74.130 14.540 45.070 42.080 13.330 9.645 12.200 55.230 15.530 6.414 54.810 27.080
5 61.200 14.380 34.330 32.400 13.710 7.368 11.210 42.090 13.540 6.187 60.340 23.760
6 57.740 16.920 56.950 27.340 14.260 7.814 10.240 69.160 12.200 6.164 49.310 20.720
7 82.690 24.330 83.120 26.210 23.960 15.590 9.178 61.710 11.520 5.915 46.260 26.660
8 76.110 22.260 46.040 58.810 22.690 21.830 8.716 61.030 66.420 5.676 60.600 62.840
9 101.000 39.780 34.730 46.660 15.560 52.060 10.440 39.410 142.300 17.530 96.510 36.670
10 59.240 40.610 81.780 31.680 12.960 58.630 9.037 31.050 97.800 14.160 72.640 68.040
11 48.450 189.900 69.570 25.470 11.570 45.900 10.920 25.590 49.540 10.210 53.210 68.470
12 43.960 95.110 43.720 21.940 11.000 26.030 42.900 22.760 38.760 9.249 91.490 78.090
13 69.860 55.290 35.660 19.240 9.927 19.810 30.340 20.740 30.180 36.240 68.340 110.500
14 91.760 46.880 29.580 17.390 9.185 17.650 16.830 26.630 24.260 31.190 46.180 108.400
15 69.630 41.820 25.520 15.910 8.682 15.270 13.570 22.320 20.630 39.760 36.870 65.880
16 50.990 41.860 22.770 14.640 8.134 14.190 11.450 46.910 17.990 70.080 31.110 47.820
17 49.200 33.020 20.700 13.450 7.577 12.120 16.330 104.400 15.910 50.940 27.340 49.660
18 55.130 28.730 18.010 12.100 7.103 10.280 13.870 40.170 21.050 33.310 25.170 69.230
19 40.980 26.090 16.180 11.380 6.691 10.140 39.910 29.970 16.260 27.790 22.820 56.320
20 32.970 27.340 14.980 12.520 6.424 9.236 141.900 49.080 13.810 82.030 22.090 39.500
21 33.080 36.520 13.700 13.730 6.219 8.028 71.640 54.060 12.310 213.600 29.070 32.740
22 45.900 29.270 12.630 75.540 5.916 7.466 55.710 31.370 11.220 107.800 102.700 39.010
23 48.090 45.500 11.910 66.890 5.746 19.900 58.600 29.000 10.230 83.350 55.220 47.800
24 35.080 29.980 19.790 34.500 5.559 80.970 36.850 28.330 9.551 197.400 95.660 47.790
25 29.820 24.410 16.410 33.180 5.326 32.780 28.400 22.320 8.530 99.050 55.530 57.440
26 26.440 21.750 74.300 66.990 5.122 50.240 45.170 21.380 8.087 88.310 78.930 93.680
27 23.810 28.040 36.970 42.770 5.069 70.130 43.030 17.630 8.085 160.300 63.010 86.730
28 21.240 26.520 26.380 31.290 5.273 42.990 29.850 15.410 7.688 153.000 149.800 53.600
29 19.340 32.340 25.690 10.100 29.560 34.230 13.810 7.351 97.300 65.180 62.520
30 17.570 58.040 21.470 11.810 24.690 31.450 12.470 7.368 65.220 50.140 80.560
31 16.200 31.860 13.790 54.300 11.550 48.780 49.530
Average 55.690 37.470 38.780 31.460 10.730 25.220 30.600 38.510 26.500 57.730 61.580 55.570
Lowest 16.200 14.230 11.910 11.380 5.069 7.368 8.716 11.550 7.351 5.676 22.090 20.720
Highest 128.100 189.900 88.370 75.540 23.960 80.970 141.900 116.300 142.300 213.600 149.800 110.500
Monthly total
(million cu m) 149.20 90.65 103.90 81.53 28.73 65.38 81.95 103.10 68.68 154.60 159.60 148.80
Runoff (mm) 161 98 112 88 31 71 89 112 74 167 173 161
Rainfall (mm) 141 109 121 114 58 153 156 134 98 225 177 155
Statistics of monthly data for previous record (Oct 1967 to Dec 1997)
Mean Avg. 47.090 40.230 35.370 22.540 15.630 11.100 10.470 16.560 22.900 36.500 42.320 46.270
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. 136 106 102 63 45 31 30 48 64 106 119 134
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. 145 108 122 75 84 81 93 107 123 148 136 146
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
1998
For 1998 For record As % of
preceding 1998 pre-1998 $ Natural to within 10% at 95 percentile flow.
Mean flow 39.200 28.880 136
Lowest yearly mean 16.400 1973
Highest yearly mean 36.420 1986
Lowest monthly mean 10.730 May 1.945 Jul 1984
Highest monthly mean 61.580 Nov 105.700 Feb 1990
Lowest daily mean 5.069 27 May 1.345 23 Jul 1984
Highest daily mean 213.600 21 Oct 410.300 31 Oct 1977
10% exceedance 81.580 68.670 119
50% exceedance 29.790 16.910 176
95% exceedance 7.355 3.343 220
Annual total (million cu m) 1236.00 911.40 136
Annual runoff (mm) 1336 985 136
Annual rainfall (mm) 1641 1368 120
{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.
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