038001 Lee at Feildes Weir 1902
Measuring authority: EA Grid reference: 52 (TL) 390 092 Catchment area (sq km): 1036.0
First year: 1879 Level stn. (m OD): 27.70 Max alt. (m OD): 229
Daily mean naturalised discharges (cubic metres per second)
DAY JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
1 4.580 2.370 3.320 2.740 1.680 2.630 1.630 1.470 1.630 1.420 1.470 1.740
2 3.740 2.000 2.890 2.680 1.680 2.160 1.890 1.470 1.630 1.210 1.160 2.160
3 3.580 2.420 2.950 2.370 1.840 2.000 1.630 1.210 1.630 1.470 1.530 2.110
4 3.530 2.320 3.210 2.370 1.680 2.000 1.840 1.420 1.580 1.420 1.470 2.000
5 3.470 2.320 2.470 2.160 2.160 2.000 1.580 1.470 1.580 1.110 1.530 1.840
6 3.320 2.420 2.680 2.210 2.050 2.110 1.320 1.680 1.580 1.470 1.470 1.790
7 3.260 2.470 2.840 2.160 2.000 2.000 1.580 1.530 1.320 1.160 1.470 1.530
8 3.260 2.370 2.630 2.260 2.210 1.950 1.580 1.950 1.580 1.420 1.470 1.790
9 3.160 2.000 2.260 2.320 2.160 2.110 1.580 1.470 1.530 1.370 1.160 1.790
10 3.160 2.370 2.680 2.260 2.160 2.000 1.580 1.210 1.580 1.420 1.530 1.530
11 3.160 2.420 2.470 2.110 1.890 2.000 1.580 1.470 1.630 1.370 1.470 1.840
12 2.790 2.320 2.420 2.160 2.110 2.000 1.630 1.470 1.790 1.160 1.470 1.580
13 3.160 2.370 2.370 1.950 2.050 2.320 1.370 1.470 1.580 1.470 1.470 1.790
14 3.160 2.420 2.370 2.210 2.110 16.800 1.630 1.420 1.260 1.420 1.470 1.260
15 3.100 2.370 3.580 2.110 2.110 11.700 1.580 1.470 1.580 1.420 1.470 1.740
16 2.790 2.000 3.630 2.160 2.000 5.680 1.580 1.420 1.580 1.420 1.260 1.890
17 2.890 2.420 3.210 2.110 2.160 4.000 1.530 1.160 1.580 1.420 1.470 1.950
18 2.840 2.370 2.890 2.160 2.000 3.160 1.580 1.420 1.580 1.470 1.470 1.950
19 2.740 2.320 2.790 2.050 2.050 2.530 1.530 1.470 1.530 1.370 1.470 2.000
20 2.890 2.370 2.470 1.950 2.160 2.790 1.320 1.740 1.580 1.470 1.470 1.950
21 2.470 2.260 2.470 2.210 2.110 2.160 1.530 1.740 1.260 1.470 1.530 1.530
22 2.420 2.320 2.370 2.160 2.160 2.160 1.530 1.420 1.630 1.420 1.420 2.000
23 2.370 2.050 2.370 2.160 2.210 2.160 1.320 1.420 1.530 1.420 1.210 1.890
24 2.420 3.210 2.630 2.160 2.210 1.950 1.530 1.210 1.530 1.420 1.530 1.890
25 2.370 3.950 2.680 2.210 1.890 1.950 1.320 1.530 1.530 1.420 1.470 1.530
26 2.260 3.320 2.680 2.160 1.950 1.950 1.580 1.470 1.580 1.160 1.530 1.680
27 2.740 3.370 2.680 1.950 1.950 2.000 1.320 1.470 1.530 1.470 1.470 1.790
28 2.740 3.260 2.160 1.950 1.950 2.000 1.530 1.530 1.260 1.420 1.470 1.740
29 2.470 2.680 2.000 1.950 1.680 1.530 1.420 1.580 1.530 1.470 2.000
30 2.370 2.110 2.000 1.950 1.740 1.370 1.420 1.530 1.470 1.210 1.890
31 2.370 2.210 2.000 1.580 1.160 1.530 1.890
Average 2.954 2.506 2.683 2.182 2.019 3.123 1.538 1.457 1.543 1.393 1.435 1.808
Lowest 2.260 2.000 2.110 1.950 1.680 1.680 1.320 1.160 1.260 1.110 1.160 1.260
Highest 4.580 3.950 3.630 2.740 2.210 16.800 1.890 1.950 1.790 1.530 1.530 2.160
Monthly total
(million cu m) 7.91 6.06 7.19 5.66 5.41 8.09 4.12 3.90 4.00 3.73 3.72 4.84
Nat'ised
runoff (mm) 8 6 7 5 5 8 4 4 4 4 4 5
Rainfall (mm)
STATISTICS OF MONTHLY DATA FOR Oct 1883 TO Feb 2010 EXCLUDING 1902 (Incomplete or missing months total 1.9 years)
Mean Avg. 8.567 8.505 7.478 6.038 4.982 3.832 3.179 2.953 2.910 3.990 5.525 7.045
nat'ised Low 1.718 1.525 1.607 1.567 1.139 1.072 1.019 0.801 0.840 1.074 1.369 1.564
flows: (year) 1992 1992 1944 1976 1976 1949 1949 1949 1949 1934 1934 1991
High 22.830 26.200 30.700 19.270 13.810 9.592 7.420 8.707 8.218 17.320 22.190 19.130
(year) 1928 2001 1947 1919 1919 1903 1889 1917 1968 1903 2000 1929
nat'ised Avg. 22 20 19 15 13 10 8 8 7 10 14 18
runoff: Low 4 4 4 4 3 3 3 2 2 3 3 4
High 59 61 79 48 36 24 19 23 21 45 56 49
Rainfall: Avg. 58 42 45 46 50 50 54 56 55 64 65 58
(1936- Low 10 3 3 2 7 5 8 3 3 4 8 15
2008) High 132 117 135 121 122 137 104 124 129 157 173 129
Summary statistics Factors affecting runoff
(naturalised flows) 1902
For 1902 For record As % of $ Flow influenced by groundwater abstraction
preceding 1902 pre-1902 and/or recharge.
Mean flow 2.050 5.403 38 $ Abstraction for public water supplies.
Lowest yearly mean 1.619 1934 $ Flow reduced by industrial and/or
Highest yearly mean 12.060 2001 agricultural abstractions.
Lowest monthly mean 1.393 Oct 0.801 Aug 1949 $ Augmentation from effluent returns.
Highest monthly mean 3.123 Jun 30.700 Mar 1947
Lowest daily mean 1.110 5 Oct 0.579 4 Sep 1949
Highest daily mean 16.800 14 Jun 119.000 17 Mar 1947
10% exceedance 2.821 9.476 30
50% exceedance 1.914 3.759 51
95% exceedance 1.285 1.612 80
Annual total (million cu m) 64.65 170.50 38
Annual runoff (mm) 62 165 38
Annual rainfall (mm) 643
{1961-90 rainfall average (mm) 630}
Station and catchment description
From 1/1/97, flows normally sum of 38027 and 38031 (but occasional erratic performance of these US stations can impact on
the precision of Feildes Weir flows; recent flows are under review). Previously: thin-plate weir (insensitive - 29m
wide) and 3 vertical-lift sluices; completed 1978 to improve hydrometric range and precision. Model rated. All flows (bar
lockages) now contained but Ryemeads STW effluent bypasses. Pre-1978: barrage of gates/sluices (operation evident on
hydrographs, pre-1930 especially); no peak flows prior to 1965, low flows probably under-estimated. Station out of
commission in 1976 but late summer flows probably the lowest on record. Mill operation could produce particularly low
flows in the early record (e.g. on Sundays). Gauging instigated by Beardmore in 1850s (flood of Oct. 1857 estimated as
>250 cumecs, greatly exceeding any subsequent event). Significant g/w abstraction; net export from catchment. Naturalised
flows (New River abstraction only) from 1883.
A mainly pervious (Chalk) catchment with extensive Drift cover. Predominantly rural headwaters; significant urban growth
in lower valley.
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