078003 Annan at Brydekirk 2000
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 36.740 154.600 42.990 12.340 13.200 7.603 5.393 12.640 35.860 37.300 43.820 190.800
2 34.120 64.390 104.400 11.180 11.320 7.946 5.111 15.550 23.530 33.360 44.630 158.300
3 56.650 48.810 66.980 10.450 10.060 7.522 4.967 10.910 17.360 42.160 34.400 101.400
4 60.610 65.180 43.120 9.458 9.270 13.190 4.764 6.924 14.250 81.810 29.700 203.600
5 76.250 47.860 36.710 8.800 8.493 9.225 4.719 5.778 22.060 69.040 26.900 203.000
6 68.300 48.980 45.650 8.308 7.912 10.480 6.005 5.202 41.040 41.950 37.490 165.900
7 84.190 70.920 54.010 7.925 7.356 11.230 5.455 4.846 45.100 76.350 53.420 128.200
8 64.620 60.150 98.890 7.855 6.872 9.055 5.193 4.601 28.620 54.060 46.310 197.400
9 43.740 60.750 87.800 7.589 6.555 28.310 8.659 17.740 21.990 135.400 34.980 135.000
10 53.370 124.400 52.980 7.341 6.312 29.780 13.050 20.340 19.340 86.240 30.340 99.210
11 92.440 65.030 41.260 8.142 6.072 27.960 8.050 9.921 75.410 54.450 64.550 84.170
12 83.170 72.850 33.470 8.955 5.804 19.120 5.933 11.410 36.620 42.280 104.400 196.800
13 50.010 54.320 29.570 13.160 5.604 22.590 5.368 71.370 26.100 34.890 53.220 159.400
14 38.340 52.000 26.290 11.300 5.403 14.830 5.037 98.840 27.630 33.720 39.390 76.420
15 31.360 54.670 23.160 8.732 5.318 11.360 4.698 38.430 25.090 27.550 47.240 54.260
16 27.530 48.720 21.110 7.780 6.162 9.477 4.437 34.010 21.730 24.560 78.990 43.260
17 24.410 45.160 19.090 8.637 27.910 8.376 4.239 29.990 24.750 29.970 44.660 36.740
18 22.030 99.250 17.420 9.288 12.140 7.772 4.094 32.140 46.730 57.400 38.100 31.940
19 20.770 63.930 15.940 8.087 8.609 7.018 3.989 23.970 60.580 34.670 36.110 39.260
20 19.450 47.010 14.550 18.750 7.722 6.749 3.843 19.630 149.600 38.580 29.950 58.580
21 17.990 58.360 13.300 23.560 8.326 11.180 3.736 18.280 62.950 34.030 26.320 35.240
22 16.930 40.280 12.290 23.420 7.094 23.220 3.634 14.920 82.320 27.140 27.800 29.210
23 14.960 53.050 25.840 16.620 8.341 17.090 3.544 11.650 46.660 82.970 26.700 25.890
24 13.790 50.720 39.930 14.030 9.019 10.660 3.521 9.978 81.790 151.000 32.390 23.410
25 12.560 37.850 28.160 26.110 7.382 8.435 3.570 9.151 97.560 274.400 73.560 21.080
26 11.640 43.320 21.760 53.870 8.897 7.368 3.558 13.310 70.020 116.300 65.390 19.200
27 11.440 226.500 17.660 36.890 8.091 6.728 3.463 14.140 132.900 116.900 48.970 16.800
28 21.420 84.830 15.200 23.420 7.810 6.334 3.815 11.600 123.700 99.920 169.700 16.610
29 49.420 58.390 13.580 18.770 7.347 6.127 4.058 9.460 66.270 75.430 106.700 14.590
30 56.880 12.460 15.850 6.167 5.778 4.218 8.190 46.450 54.830 78.480 13.200
31 102.400 12.610 5.971 5.793 34.450 46.050 17.510
Average 42.500 69.040 35.100 14.890 8.469 12.420 5.029 20.300 52.470 68.220 52.490 83.750
Lowest 11.440 37.850 12.290 7.341 5.318 5.778 3.463 4.601 14.250 24.560 26.320 13.200
Highest 102.400 226.500 104.400 53.870 27.910 29.780 13.050 98.840 149.600 274.400 169.700 203.600
Monthly total
(million cu m) 113.80 173.00 94.02 38.59 22.68 32.19 13.47 54.38 136.00 182.70 136.00 224.30
Runoff (mm) 123 187 102 42 25 35 15 59 147 198 147 243
Rainfall (mm) 142 171 92 75 71 78 65 151 199 219 174 221
Statistics of monthly data for previous record (Oct 1967 to Dec 1999)
Mean Avg. 48.300 39.730 35.240 23.250 15.800 11.710 11.280 16.920 22.940 36.530 43.170 47.600
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. 140 105 102 65 46 33 33 49 64 106 121 138
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. 147 108 121 78 84 84 94 106 123 148 138 149
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
2000
For 2000 For record As % of
preceding 2000 pre-2000 $ Natural to within 10% at 95 percentile flow.
Mean flow 38.620 29.340 132
Lowest yearly mean 16.400 1973
Highest yearly mean 39.200 1998
Lowest monthly mean 5.029 Jul 1.945 Jul 1984
Highest monthly mean 83.750 Dec 105.700 Feb 1990
Lowest daily mean 3.463 27 Jul 1.345 23 Jul 1984
Highest daily mean 274.400 25 Oct 410.300 31 Oct 1977
10% exceedance 84.870 69.310 122
50% exceedance 25.520 17.400 147
95% exceedance 4.768 3.420 139
Annual total (million cu m) 1221.00 925.90 132
Annual runoff (mm) 1320 1001 132
Annual rainfall (mm) 1658 1380 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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