203028 Agivey at Whitehill 1998
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 22.050 1.428 6.724 1.204 1.524 0.870 1.225 1.576 1.307 0.861 3.174 1.894
2 6.705 1.922 6.174 2.528 1.150 0.669 0.887 2.496 3.724 0.692 29.320 1.855
3 6.570 1.665 4.177 4.692 0.983 0.553 0.712 5.658 1.338 0.626 9.536 1.871
4 5.171 1.663 2.594 5.339 0.935 0.517 0.647 1.811 1.032 0.556 7.259 1.712
5 4.294 1.410 5.207 2.675 4.789 0.504 0.581 1.277 1.199 0.526 4.166 1.904
6 10.010 1.617 13.330 1.783 6.187 0.922 0.520 1.483 1.061 0.507 2.817 1.590
7 3.560 2.636 5.664 1.429 5.236 0.822 0.481 2.239 3.666 0.494 6.701 1.819
8 3.712 1.786 3.333 1.810 1.844 4.775 0.504 3.826 4.155 0.475 8.786 2.702
9 3.721 1.389 2.022 1.906 1.514 3.226 0.626 1.627 6.411 0.602 6.384 1.746
10 5.572 1.367 6.688 1.251 1.158 2.675 1.461 1.148 6.333 0.850 3.340 2.035
11 2.569 1.868 3.786 1.096 1.012 1.443 1.494 1.069 5.202 2.047 9.390 2.627
12 1.939 1.366 2.863 1.268 0.934 0.945 15.890 3.968 15.480 1.424 15.370 2.284
13 1.825 1.098 2.554 1.462 0.830 3.072 7.777 5.377 3.944 1.796 3.894 4.105
14 3.288 0.995 2.021 3.268 0.921 1.149 3.529 3.407 3.956 1.744 2.385 4.462
15 3.443 0.988 1.624 1.923 0.826 0.701 2.138 1.570 2.445 1.347 1.939 2.109
16 2.962 0.990 1.408 1.299 0.752 0.563 1.373 1.282 2.206 6.747 1.708 1.627
17 3.011 0.924 1.472 1.017 0.703 0.502 5.014 1.183 1.499 6.576 4.109 2.120
18 5.543 0.838 1.205 0.913 0.640 0.488 2.023 0.951 1.286 1.841 2.610 4.048
19 3.334 0.800 1.068 0.884 0.592 0.480 19.340 0.817 1.048 2.669 2.140 4.295
20 6.317 1.363 1.013 0.908 0.565 0.536 4.513 1.113 0.912 26.790 2.704 2.624
21 5.650 1.529 0.966 2.209 0.538 0.795 1.955 4.380 0.813 7.025 8.366 2.225
22 5.348 1.182 0.904 3.604 0.527 0.822 2.061 3.579 0.748 26.800 5.070 2.670
23 5.459 1.313 0.905 2.401 0.549 1.182 2.383 1.615 0.711 6.521 2.640 2.460
24 2.872 1.019 1.076 1.673 0.539 1.130 1.430 1.140 0.678 27.220 2.413 3.725
25 2.027 0.848 1.103 1.392 0.533 1.097 3.344 5.216 0.655 5.806 3.926 5.617
26 1.641 0.817 1.439 3.200 0.534 7.322 7.019 2.451 0.634 9.686 12.630 16.490
27 1.447 1.155 1.155 1.922 0.499 2.258 2.522 1.280 0.623 7.556 3.846 3.536
28 1.251 2.192 0.975 1.666 0.493 5.242 1.783 1.015 0.595 13.610 3.504 2.060
29 1.220 5.680 4.592 3.747 2.279 9.533 0.849 0.567 9.852 2.525 28.040
30 1.235 3.468 2.669 1.312 1.927 8.509 0.734 0.715 4.574 2.377 8.448
31 1.194 1.580 1.060 2.558 0.703 2.845 10.590
Average 4.353 1.363 3.038 2.133 1.401 1.649 3.672 2.156 2.498 5.828 5.834 4.364
Lowest 1.194 0.800 0.904 0.884 0.493 0.480 0.481 0.703 0.567 0.475 1.708 1.590
Highest 22.050 2.636 13.330 5.339 6.187 7.322 19.340 5.658 15.480 27.220 29.320 28.040
Monthly total
(million cu m) 11.66 3.30 8.14 5.53 3.75 4.27 9.84 5.77 6.47 15.61 15.12 11.69
Runoff (mm) 116 33 81 55 37 43 98 57 64 155 150 116
Rainfall (mm) 126 66 89 98 60 125 161 105 93 219 167 146
Statistics of monthly data for previous record (Dec 1972 to Dec 1997)
Mean Avg. 5.185 3.942 3.398 2.215 1.603 1.073 0.963 1.521 1.992 3.616 3.789 4.449
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 2.162 5.002 7.061 6.749 6.737 7.115
(year) 1974 1990 1989 1989 1981 1990 1990 1985 1985 1990 1982 1986
Runoff: Avg. 138 96 91 57 43 28 26 41 51 96 98 119
Low 28 22 37 24 11 11 8 4 10 28 24 59
High 211 215 155 133 105 66 58 133 182 180 174 190
Rainfall: Avg. 142 99 111 75 75 72 78 92 95 134 122 129
Low 34 5 36 22 14 37 26 15 15 51 33 58
High 221 217 191 149 179 150 144 218 213 233 196 251
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 3.208 2.810 114
Lowest yearly mean 2.187 1997
Highest yearly mean 3.793 1990
Lowest monthly mean 1.363 Feb 0.161 Aug 1995
Highest monthly mean 5.834 Nov 8.932 Feb 1990
Lowest daily mean 0.475 8 Oct 0.110 24 Jul 1989
Highest daily mean 29.320 2 Nov 71.260 21 Oct 1987
10% exceedance 6.604 6.554 101
50% exceedance 1.835 1.525 120
95% exceedance 0.541 0.357 152
Annual total (million cu m) 101.20 88.68 114
Annual runoff (mm) 1007 882 114
Annual rainfall (mm) 1455 1224 119
{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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