203028 Agivey at Whitehill 1996
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 16.170 0.928 1.167 0.566 10.300 1.335 0.542 0.495 0.573 0.627 2.207 3.438
2 4.772 0.869 1.091 0.537 2.851 1.060 0.524 0.678 0.543 0.545 1.929 3.701
3 5.024 0.790 1.012 0.547 1.645 1.170 0.660 0.460 0.526 1.863 2.615 10.570
4 16.440 1.256 0.901 0.503 1.229 0.920 0.563 0.365 0.501 3.680 8.951 4.860
5 8.862 5.205 0.832 0.508 1.438 0.777 0.736 8.549 0.475 2.248 9.996 8.536
6 5.523 3.356 0.798 0.507 1.343 0.648 0.513 15.680 0.460 1.030 10.370 2.994
7 9.444 2.038 0.810 0.491 1.045 0.560 0.578 1.994 0.436 0.953 4.109 13.410
8 13.310 7.569 0.797 0.493 0.884 0.513 0.463 1.220 0.414 0.884 4.074 8.695
9 5.627 18.630 0.808 0.461 0.804 0.718 0.412 0.878 0.397 0.751 3.965 3.039
10 2.961 7.814 0.824 0.595 0.742 1.499 0.373 1.764 0.410 0.691 2.405 2.179
11 3.722 10.730 0.840 0.570 0.710 1.172 0.511 0.846 0.454 0.694 1.861 1.741
12 6.246 6.200 11.300 3.409 0.689 0.920 0.671 0.594 0.510 6.756 1.626 1.565
13 5.134 2.618 4.230 1.784 0.651 0.631 0.465 0.550 0.488 8.837 1.796 1.426
14 8.726 1.879 2.181 4.652 0.588 0.535 0.408 0.499 0.441 3.070 2.164 1.317
15 3.617 1.721 2.268 1.701 0.554 0.484 0.346 0.452 0.429 1.639 1.733 1.370
16 2.477 1.977 3.302 4.908 1.258 0.447 0.319 0.415 0.398 3.101 1.573 1.360
17 2.091 7.326 2.532 5.055 1.022 0.409 0.294 0.394 0.371 1.804 1.928 1.191
18 2.959 9.078 3.713 5.682 0.736 0.387 0.266 0.375 0.364 2.239 1.578 1.905
19 10.870 2.984 1.931 4.013 3.113 0.392 0.261 0.395 0.365 1.545 1.465 1.678
20 6.316 1.938 1.432 3.423 3.924 0.382 0.230 8.153 0.374 1.549 1.337 1.215
21 2.696 2.194 1.420 13.290 1.441 0.371 0.329 4.228 0.369 1.340 1.313 0.995
22 2.074 2.655 1.374 4.792 4.952 0.346 1.198 14.480 0.363 1.191 1.848 0.859
23 1.750 2.089 1.125 2.423 1.733 0.348 1.034 4.061 0.363 1.848 2.383 0.842
24 1.520 2.174 1.067 3.959 1.297 0.348 0.669 2.723 0.414 11.910 8.153 0.800
25 1.322 2.438 1.039 2.740 1.016 0.356 0.452 3.577 0.511 18.730 9.505 0.743
26 1.148 2.051 0.771 1.935 1.250 0.361 0.436 2.833 0.474 8.823 4.669 0.832
27 1.138 1.652 0.674 1.507 1.259 0.399 0.415 1.474 0.481 7.519 9.002 0.987
28 1.168 1.363 0.658 1.260 1.749 0.488 0.891 1.037 0.717 14.500 10.280 0.770
29 1.148 1.229 0.675 1.237 1.312 0.394 1.169 0.831 1.284 4.475 6.479 0.706
30 1.060 0.639 7.269 5.312 0.391 0.638 0.717 0.896 2.501 3.565 0.674
31 0.998 0.618 2.128 0.522 0.623 2.954 0.667
Average 5.042 3.888 1.704 2.694 1.902 0.625 0.545 2.624 0.493 3.881 4.163 2.744
Lowest 0.998 0.790 0.618 0.461 0.554 0.346 0.230 0.365 0.363 0.545 1.313 0.667
Highest 16.440 18.630 11.300 13.290 10.300 1.499 1.198 15.680 1.284 18.730 10.370 13.410
Monthly total
(million cu m) 13.51 9.74 4.56 6.98 5.10 1.62 1.46 7.03 1.28 10.39 10.79 7.35
Runoff (mm) 134 97 45 69 51 16 15 70 13 103 107 73
Rainfall (mm) 121 110 48 123 84 48 79 129 41 176 140 74
Statistics of monthly data for previous record (Dec 1972 to Dec 1995)
Mean Avg. 5.371 3.933 3.537 2.248 1.536 1.084 0.979 1.495 2.084 3.681 3.749 4.516
flows: Low 2.544 0.923 1.384 0.920 0.394 0.436 0.308 0.161 0.388 1.039 0.948 2.217
(year) 1992 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. 143 96 94 58 41 28 26 40 54 98 97 120
Low 68 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. 147 96 116 75 72 72 78 90 99 134 120 130
Low 63 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
1996
For 1996 For record As % of
preceding 1996 pre-1996 $ Natural to within 10% at 95 percentile flow.
Mean flow 2.524 2.849 89
Lowest yearly mean 2.192 1975
Highest yearly mean 3.793 1990
Lowest monthly mean 0.493 Sep 0.161 Aug 1995
Highest monthly mean 5.042 Jan 8.932 Feb 1990
Lowest daily mean 0.230 20 Jul 0.110 24 Jul 1989
Highest daily mean 18.730 25 Oct 71.260 21 Oct 1987
10% exceedance 7.346 6.586 112
50% exceedance 1.236 1.565 79
95% exceedance 0.370 0.354 104
Annual total (million cu m) 79.81 89.91 89
Annual runoff (mm) 794 895 89
Annual rainfall (mm) 1173 1229 95
{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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