078003 Annan at Brydekirk 1999
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 60.710 28.610 39.300 25.990 13.690 11.620 11.880 6.612 5.506 30.210 75.270 79.750
2 138.300 25.870 66.420 21.740 12.470 12.530 10.820 9.352 5.354 28.550 42.260 94.280
3 89.490 28.190 55.130 19.350 11.150 19.160 31.420 6.784 5.205 21.610 29.930 171.800
4 95.000 37.880 37.400 19.050 10.180 20.610 21.890 6.219 4.891 17.140 41.490 81.180
5 181.200 28.580 29.610 35.690 9.437 26.550 15.750 6.822 4.592 14.620 220.700 96.920
6 118.800 24.630 24.970 83.950 9.278 21.530 15.130 9.160 4.494 13.200 90.440 195.800
7 80.730 21.630 22.290 40.590 9.831 18.940 12.160 6.634 7.532 14.440 51.830 96.170
8 71.860 19.340 19.480 30.800 20.620 19.550 11.170 5.998 6.783 15.250 41.260 142.400
9 49.400 16.930 17.810 26.440 53.420 14.400 9.819 5.546 8.380 16.870 32.080 161.000
10 39.570 15.470 16.260 25.020 67.110 12.270 25.130 5.267 6.295 14.670 26.760 83.980
11 33.370 15.040 15.060 49.420 87.170 11.080 17.910 5.071 5.796 14.220 23.130 85.430
12 31.670 15.740 16.340 53.780 84.900 10.720 10.260 4.978 9.643 12.190 20.380 63.210
13 56.120 15.500 22.080 37.580 55.440 11.060 9.246 6.388 7.021 11.040 18.150 48.460
14 71.570 18.260 16.820 30.370 43.910 11.240 9.046 7.397 6.813 10.300 16.300 40.180
15 193.100 17.100 14.450 28.120 30.550 9.557 11.530 6.447 5.727 9.618 15.030 33.500
16 95.520 15.450 14.000 24.920 25.090 8.704 8.495 5.960 6.641 8.961 14.240 46.040
17 57.660 16.670 13.340 21.140 21.060 8.563 8.470 6.193 51.500 8.317 12.950 98.280
18 83.120 36.680 13.500 19.640 17.920 7.696 12.100 6.445 31.770 7.753 11.780 44.090
19 125.000 58.180 12.260 18.490 15.600 31.330 33.780 6.019 29.090 7.388 10.670 33.240
20 71.180 43.350 12.000 61.900 13.830 36.470 68.940 5.159 60.690 7.130 9.999 27.720
21 50.650 53.220 30.920 104.800 14.620 16.010 33.090 4.803 36.750 7.034 9.538 31.870
22 41.090 38.280 20.220 97.840 14.350 12.300 22.280 4.576 23.160 30.120 9.358 124.600
23 45.210 29.540 24.180 50.200 13.920 10.800 16.630 4.418 38.420 31.680 9.209 109.200
24 104.500 25.670 22.270 36.580 19.720 9.504 13.950 4.290 57.610 26.150 28.730 150.900
25 135.300 25.170 18.260 29.660 14.890 8.498 12.000 4.404 38.360 24.220 19.900 103.100
26 64.970 27.480 15.380 24.810 20.830 14.350 10.430 6.527 26.010 18.020 38.890 57.670
27 51.330 21.480 13.410 21.400 18.770 41.980 9.098 8.716 21.660 16.350 44.510 50.760
28 48.310 35.880 45.060 18.830 25.590 25.410 8.277 5.925 20.110 17.300 295.800 38.220
29 40.430 120.400 16.900 22.570 19.040 7.755 5.194 54.770 13.980 162.700 31.130
30 35.920 43.630 15.140 15.080 13.730 7.118 5.509 34.320 16.030 115.100 49.560
31 31.960 31.270 12.770 6.565 5.752 19.060 41.160
Average 77.190 26.990 27.860 36.340 25.990 16.510 16.200 6.083 20.830 16.240 51.280 81.020
Lowest 31.670 15.040 12.000 15.140 9.278 7.696 6.565 4.290 4.494 7.034 9.209 27.720
Highest 193.100 58.180 120.400 104.800 87.170 41.980 68.940 9.352 60.690 31.680 295.800 195.800
Monthly total
(million cu m) 206.80 65.30 74.61 94.19 69.62 42.79 43.38 16.29 53.99 43.50 132.90 217.00
Runoff (mm) 224 71 81 102 75 46 47 18 58 47 144 235
Rainfall (mm) 218 82 86 119 129 106 70 67 143 71 174 233
Statistics of monthly data for previous record (Oct 1967 to Dec 1998)
Mean Avg. 47.370 40.140 35.480 22.820 15.470 11.560 11.120 17.270 23.010 37.170 42.920 46.560
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. 137 106 103 64 45 32 32 50 64 108 120 135
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 76 83 83 95 108 122 151 137 146
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
1999
For 1999 For record As % of
preceding 1999 pre-1999 $ Natural to within 10% at 95 percentile flow.
Mean flow 33.620 29.200 115
Lowest yearly mean 16.400 1973
Highest yearly mean 39.200 1998
Lowest monthly mean 6.083 Aug 1.945 Jul 1984
Highest monthly mean 81.020 Dec 105.700 Feb 1990
Lowest daily mean 4.290 24 Aug 1.345 23 Jul 1984
Highest daily mean 295.800 28 Nov 410.300 31 Oct 1977
10% exceedance 82.050 69.200 119
50% exceedance 20.340 17.280 118
95% exceedance 5.722 3.384 169
Annual total (million cu m) 1060.00 921.50 115
Annual runoff (mm) 1146 996 115
Annual rainfall (mm) 1498 1376 109
{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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