203028 Agivey at Whitehill 2000
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 2.604 2.433 3.763 1.031 1.163 2.018 0.390 0.415 0.665 2.354 4.563 4.032
2 2.140 1.746 20.730 9.877 1.012 1.343 0.367 0.624 0.511 6.456 3.561 3.148
3 2.056 1.544 4.874 3.363 0.944 0.951 0.356 0.445 0.404 7.767 7.251 6.563
4 2.145 1.476 2.644 2.039 0.868 0.766 0.346 0.365 0.377 3.207 3.920 18.300
5 3.382 1.310 2.072 1.606 0.804 0.725 0.335 0.329 0.413 2.101 2.434 6.159
6 4.881 1.311 1.829 1.238 0.764 0.947 0.328 0.321 0.597 1.664 3.554 2.999
7 4.001 3.548 2.363 1.082 0.730 2.051 0.326 0.348 0.946 1.605 7.040 7.726
8 4.178 3.923 5.830 1.064 0.697 3.917 0.389 0.426 0.560 1.292 4.250 29.040
9 2.801 4.017 3.374 0.901 0.656 1.130 0.477 2.503 0.420 12.150 6.809 8.843
10 2.551 3.756 2.346 0.861 0.623 1.132 0.490 1.192 0.552 10.410 3.782 6.256
11 3.188 3.053 1.754 2.649 0.587 1.108 0.411 0.723 1.819 3.622 4.285 3.635
12 2.552 4.530 1.494 3.268 0.564 0.838 0.371 0.509 1.273 5.081 9.293 13.090
13 2.268 3.172 2.110 1.805 0.570 0.679 0.379 0.849 0.801 2.521 8.098 5.325
14 1.890 5.401 2.383 1.172 0.548 0.559 0.381 1.251 0.649 2.225 7.580 4.097
15 1.486 3.722 1.524 0.952 0.533 0.521 0.354 0.671 0.601 1.581 3.990 3.578
16 1.542 4.981 1.292 2.409 0.582 0.487 0.334 0.544 0.510 2.930 6.595 3.740
17 1.621 9.405 1.181 1.264 0.664 0.462 0.316 1.835 0.891 13.080 7.669 3.499
18 1.665 6.277 1.109 0.959 1.217 0.452 0.308 1.320 1.444 4.180 6.806 2.875
19 1.406 3.521 1.019 2.755 1.563 0.423 0.305 0.647 0.821 2.017 10.450 5.681
20 1.272 3.430 0.952 4.309 1.009 0.481 0.294 0.735 10.130 2.421 9.215 9.901
21 1.412 3.056 0.915 2.536 0.877 1.149 0.280 1.885 9.705 1.629 3.989 3.122
22 1.340 2.780 0.884 1.638 0.817 0.850 0.271 0.581 2.574 3.739 3.887 2.263
23 1.126 2.101 0.871 1.179 0.721 0.842 0.262 0.435 2.736 13.760 2.664 1.884
24 1.112 2.104 1.084 1.724 0.771 1.135 0.257 0.370 8.472 14.000 2.202 1.619
25 1.028 1.804 1.007 4.535 1.044 0.659 0.255 0.402 2.133 7.228 8.066 1.418
26 0.980 2.880 2.162 20.300 1.262 0.526 0.251 0.472 5.250 6.061 5.226 1.266
27 0.973 8.745 1.190 5.443 1.044 0.473 0.243 0.427 10.790 7.468 7.334 1.199
28 1.584 2.978 0.934 2.174 0.755 0.429 0.642 0.379 2.844 13.780 8.877 1.051
29 4.304 2.989 0.830 1.842 3.462 0.393 0.475 0.346 3.031 7.596 5.620 1.010
30 7.040 0.787 1.528 2.362 0.407 0.339 0.361 1.820 4.219 6.677 0.980
31 3.577 0.806 1.493 0.317 0.978 7.042 18.620
Average 2.390 3.517 2.455 2.917 0.990 0.928 0.350 0.732 2.458 5.651 5.856 5.901
Lowest 0.973 1.310 0.787 0.861 0.533 0.393 0.243 0.321 0.377 1.292 2.202 0.980
Highest 7.040 9.405 20.730 20.300 3.462 3.917 0.642 2.503 10.790 14.000 10.450 29.040
Monthly total
(million cu m) 6.40 8.81 6.58 7.56 2.65 2.41 0.94 1.96 6.37 15.14 15.18 15.80
Runoff (mm) 64 88 65 75 26 24 9 20 63 151 151 157
Rainfall (mm) 71 121 70 109 75 60 38 114 142 227 179 173
Statistics of monthly data for previous record (Dec 1972 to Dec 1999)
Mean Avg. 5.169 3.821 3.334 2.230 1.596 1.093 1.062 1.526 2.168 3.632 3.863 4.623
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 9.428
(year) 1974 1990 1989 1989 1981 1990 1998 1985 1985 1990 1982 1999
Runoff: Avg. 138 93 89 58 43 28 28 41 56 97 100 123
Low 28 22 37 24 11 11 8 4 10 28 24 59
High 211 215 155 133 105 66 98 133 182 180 174 251
Rainfall: Avg. 142 99 109 77 75 74 81 92 100 134 124 135
Low 34 5 36 22 14 37 26 15 15 51 33 58
High 221 217 191 149 179 150 161 218 219 233 196 286
Summary statistics Factors affecting runoff
2000
For 2000 For record As % of
preceding 2000 pre-2000 $ Natural to within 10% at 95 percentile flow.
Mean flow 2.840 2.841 100
Lowest yearly mean 2.187 1997
Highest yearly mean 3.793 1990
Lowest monthly mean 0.350 Jul 0.161 Aug 1995
Highest monthly mean 5.901 Dec 9.428 Dec 1999
Lowest daily mean 0.243 27 Jul 0.110 24 Jul 1989
Highest daily mean 29.040 8 Dec 71.260 21 Oct 1987
10% exceedance 7.100 6.601 108
50% exceedance 1.561 1.540 101
95% exceedance 0.340 0.363 93
Annual total (million cu m) 89.81 89.66 100
Annual runoff (mm) 894 892 100
Annual rainfall (mm) 1379 1242 111
{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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