203028 Agivey at Whitehill 1999
Measuring authority: RA Grid reference: 24 (IC) 882 193 Catchment area (sq km): 100.5
First year: 1972 Level stn. (m OD): 17.00 Max alt. (m OD): 461
Daily mean gauged discharges (cubic metres per second)
DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1 11.080 1.774 4.956 1.204 0.848 0.701 0.691 0.361 0.492 5.453 1.911 3.804
2 14.490 1.574 3.129 2.104 0.792 0.682 0.793 0.427 0.431 9.633 1.366 17.610
3 8.576 1.434 3.719 1.302 0.760 0.737 3.163 2.172 0.407 7.977 1.066 12.000
4 4.835 1.500 2.431 1.102 0.736 1.499 1.963 1.119 0.427 3.878 6.634 7.376
5 5.103 4.070 1.960 1.416 0.713 1.145 1.093 0.784 0.445 2.285 11.590 6.356
6 2.961 4.953 2.244 3.327 0.695 0.863 0.920 0.911 3.065 1.671 3.435 6.839
7 2.858 2.873 1.767 1.810 0.686 0.699 1.008 5.312 1.449 1.457 2.570 6.265
8 2.271 2.456 1.431 1.350 0.693 0.592 0.856 1.634 8.171 1.623 2.426 22.080
9 3.316 1.888 1.300 1.148 0.711 0.548 0.651 0.869 1.679 1.553 1.751 11.240
10 2.133 1.865 1.217 1.071 1.454 0.527 0.582 0.651 1.002 1.564 1.434 9.291
11 1.687 2.212 1.117 3.378 11.090 0.511 0.557 0.556 23.870 1.316 1.230 9.858
12 5.937 3.020 1.054 4.281 7.855 0.507 0.532 0.537 8.006 1.174 1.067 17.610
13 12.850 1.773 1.114 5.842 2.775 1.028 0.546 0.616 3.156 1.096 0.964 4.782
14 7.780 1.562 1.048 7.302 1.535 0.979 0.521 1.443 1.478 1.023 0.889 2.889
15 7.213 1.427 0.945 3.557 1.120 0.675 0.497 1.582 6.851 0.953 0.932 3.514
16 2.882 1.946 0.892 2.016 0.942 0.583 0.504 1.219 18.410 0.886 3.604 7.493
17 2.567 3.272 0.851 1.550 0.843 0.565 0.511 1.397 2.570 0.822 4.554 6.554
18 9.261 5.946 0.852 1.336 0.782 0.528 0.525 2.066 11.110 0.760 2.688 2.544
19 3.185 3.337 0.873 1.100 0.715 0.835 1.691 0.992 20.140 0.699 1.587 2.004
20 2.682 2.184 0.933 8.038 0.652 1.578 2.285 0.684 26.820 0.654 1.262 12.190
21 1.957 4.546 3.886 11.010 0.635 1.346 2.262 0.555 20.420 0.649 1.170 13.160
22 1.730 3.760 3.184 2.904 0.645 3.629 1.762 0.503 3.588 0.808 1.303 27.110
23 2.946 8.757 3.323 2.753 0.775 2.171 0.855 0.463 5.765 0.951 1.244 8.016
24 15.440 3.470 1.884 1.825 0.796 1.067 0.622 0.435 4.951 0.896 1.718 29.210
25 6.572 2.239 1.386 2.078 0.653 0.756 0.552 0.509 2.634 1.119 1.340 5.537
26 5.512 1.869 4.589 1.811 0.627 1.084 0.509 0.782 2.000 1.025 6.259 3.583
27 11.890 4.819 1.909 1.294 0.608 1.817 0.456 0.660 1.571 0.813 6.227 5.370
28 5.266 10.590 3.786 1.067 4.687 1.499 0.409 0.516 1.734 0.737 32.300 4.777
29 3.402 2.330 0.965 2.152 0.987 0.394 0.745 2.196 0.711 4.757 9.290
30 2.526 1.440 0.910 1.131 0.778 0.385 0.631 2.403 1.362 2.996 10.390
31 2.019 1.292 0.843 0.375 0.552 1.833 3.530
Average 5.578 3.254 2.027 2.695 1.611 1.031 0.918 1.022 6.241 1.851 3.742 9.428
Lowest 1.687 1.427 0.851 0.910 0.608 0.507 0.375 0.361 0.407 0.649 0.889 2.004
Highest 15.440 10.590 4.956 11.010 11.090 3.629 3.163 5.312 26.820 9.633 32.300 29.210
Monthly total
(million cu m) 14.94 7.87 5.43 6.99 4.32 2.67 2.46 2.74 16.18 4.96 9.70 25.25
Runoff (mm) 149 78 54 70 43 27 24 27 161 49 97 251
Rainfall (mm) 174 117 71 106 80 88 76 89 219 66 134 286
Statistics of monthly data for previous record (Dec 1972 to Dec 1998)
Mean Avg. 5.153 3.843 3.384 2.212 1.596 1.096 1.067 1.545 2.011 3.701 3.867 4.445
flows: Low 1.065 0.923 1.384 0.920 0.394 0.436 0.308 0.161 0.388 1.039 0.948 2.217
(year) 1997 1986 1973 1984 1984 1984 1984 1995 1991 1994 1983 1995
High 7.902 8.932 5.800 5.163 3.925 2.575 3.672 5.002 7.061 6.749 6.737 7.115
(year) 1974 1990 1989 1989 1981 1990 1998 1985 1985 1990 1982 1986
Runoff: Avg. 137 93 90 57 43 28 28 41 52 99 100 118
Low 28 22 37 24 11 11 8 4 10 28 24 59
High 211 215 155 133 105 66 98 133 182 180 174 190
Rainfall: Avg. 141 98 110 76 74 74 81 92 95 137 123 129
Low 34 5 36 22 14 37 26 15 15 51 33 58
High 221 217 191 149 179 150 161 218 213 233 196 251
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 3.282 2.825 116
Lowest yearly mean 2.187 1997
Highest yearly mean 3.793 1990
Lowest monthly mean 0.918 Jul 0.161 Aug 1995
Highest monthly mean 9.428 Dec 8.932 Feb 1990
Lowest daily mean 0.361 1 Aug 0.110 24 Jul 1989
Highest daily mean 32.300 28 Nov 71.260 21 Oct 1987
10% exceedance 7.939 6.558 121
50% exceedance 1.582 1.538 103
95% exceedance 0.509 0.360 141
Annual total (million cu m) 103.50 89.15 116
Annual runoff (mm) 1030 887 116
Annual rainfall (mm) 1506 1230 122
{1961-90 rainfall average (mm) 1270}
Station and catchment description
Velocity-area station with cableway. Flows from 1975 onwards reprocessed in 2002.
Geology: mainly basalt overlain by till with some peat. Significant proportion of upland, predominantly grassland with
significant bog and some shrub heath and coniferous woodland. No urban areas or major industry.
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