203028 Agivey at Whitehill 1997
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 0.673 0.628 3.054 0.885 0.757 0.503 1.211 2.186 5.431 0.529 0.622 2.236
2 0.726 0.680 3.463 0.845 0.634 0.478 5.070 1.056 3.501 0.468 0.815 4.579
3 0.765 0.875 2.179 0.926 0.593 0.447 1.513 0.733 8.243 0.428 0.986 2.201
4 0.736 2.462 1.700 0.886 0.815 0.429 0.914 0.554 2.112 0.417 1.022 1.685
5 0.678 1.380 1.500 1.400 3.885 0.443 0.692 0.474 1.294 0.487 1.222 1.901
6 0.670 1.150 1.332 1.524 4.756 0.912 0.583 0.427 2.049 0.808 1.035 2.041
7 0.666 0.934 5.993 1.177 18.510 1.674 0.526 0.394 2.199 0.739 0.837 1.832
8 0.683 0.801 2.815 0.910 5.976 0.931 0.522 0.371 1.157 0.560 0.744 3.643
9 0.617 0.790 1.780 0.775 2.826 0.631 0.479 0.378 0.858 4.518 0.684 7.865
10 1.252 2.560 1.449 0.698 13.810 0.553 0.428 0.390 0.712 3.908 1.444 8.163
11 2.699 4.828 1.271 0.658 3.948 1.179 0.408 0.356 0.651 1.649 1.366 8.564
12 1.496 4.537 1.154 0.633 2.962 1.032 0.413 0.337 0.835 1.112 1.124 3.326
13 1.140 3.115 1.095 0.611 1.981 1.172 0.607 0.371 1.005 1.378 0.886 2.170
14 0.964 1.869 1.154 0.603 1.387 0.758 0.558 0.369 0.817 5.841 0.814 1.749
15 0.845 1.560 1.199 0.595 1.081 0.566 0.539 0.361 0.733 4.349 0.827 1.487
16 0.784 4.374 1.183 0.572 0.895 0.487 0.522 0.359 1.829 4.775 2.190 1.328
17 1.662 8.210 1.219 0.546 0.952 0.453 0.492 0.369 1.246 9.630 23.370 1.232
18 3.796 7.293 1.654 0.533 3.815 0.488 0.452 0.345 0.781 3.930 9.517 4.239
19 1.900 21.130 2.057 0.526 1.960 1.326 0.420 0.325 0.617 1.987 9.935 2.086
20 1.313 9.528 1.430 0.510 5.848 2.207 0.386 0.324 0.556 1.386 7.580 1.528
21 1.082 4.644 1.120 0.496 2.603 2.779 0.364 0.332 0.531 1.087 3.745 1.311
22 0.959 2.593 1.751 0.491 1.708 1.179 0.380 0.310 0.493 0.940 3.105 3.554
23 0.845 4.406 2.824 0.498 1.157 0.777 0.517 0.297 0.463 0.817 6.503 3.628
24 0.879 4.211 2.327 0.586 0.921 3.639 0.682 0.293 0.443 0.763 10.750 12.080
25 0.852 4.543 1.678 1.124 0.798 7.304 0.691 0.293 0.426 0.722 10.290 15.510
26 0.823 5.524 1.357 0.953 0.738 2.689 0.944 0.319 0.424 0.676 14.060 7.299
27 0.787 9.358 2.986 1.774 0.695 1.101 0.676 0.358 0.423 0.637 4.336 7.170
28 0.721 4.034 2.665 5.280 0.647 0.780 0.708 0.358 0.426 0.599 2.704 6.134
29 0.686 1.573 1.684 0.603 0.643 2.066 0.400 0.418 0.580 4.988 5.141
30 0.665 1.213 1.027 0.558 0.553 1.672 0.342 0.470 0.589 2.545 9.982
31 0.637 1.008 0.528 5.881 17.670 0.591 5.265
Average 1.065 4.215 1.909 0.991 2.850 1.270 1.010 1.015 1.371 1.835 4.335 4.546
Lowest 0.617 0.628 1.008 0.491 0.528 0.429 0.364 0.293 0.418 0.417 0.622 1.232
Highest 3.796 21.130 5.993 5.280 18.510 7.304 5.881 17.670 8.243 9.630 23.370 15.510
Monthly total
(million cu m) 2.85 10.20 5.11 2.57 7.63 3.29 2.71 2.72 3.56 4.92 11.24 12.18
Runoff (mm) 28 101 51 26 76 33 27 27 35 49 112 121
Rainfall (mm) 34 155 65 49 126 93 95 84 61 91 135 157
Statistics of monthly data for previous record (Dec 1972 to Dec 1996)
Mean Avg. 5.357 3.931 3.460 2.266 1.552 1.065 0.961 1.542 2.017 3.690 3.766 4.445
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 92 58 41 27 26 41 52 98 97 118
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. 146 97 113 76 73 71 78 92 97 135 121 128
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
1997
For 1997 For record As % of
preceding 1997 pre-1997 $ Natural to within 10% at 95 percentile flow.
Mean flow 2.187 2.836 77
Lowest yearly mean 2.192 1975
Highest yearly mean 3.793 1990
Lowest monthly mean 0.991 Apr 0.161 Aug 1995
Highest monthly mean 4.546 Dec 8.932 Feb 1990
Lowest daily mean 0.293 24 Aug 0.110 24 Jul 1989
Highest daily mean 23.370 17 Nov 71.260 21 Oct 1987
10% exceedance 5.275 6.603 80
50% exceedance 1.011 1.552 65
95% exceedance 0.367 0.357 103
Annual total (million cu m) 68.97 89.50 77
Annual runoff (mm) 686 891 77
Annual rainfall (mm) 1145 1227 93
{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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