038001 Lee at Feildes Weir 1942
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 3.680 8.520 4.890 5.370 2.840 2.890 2.210 1.630 1.630 2.160 5.260 2.740
2 3.740 7.310 5.210 5.100 2.840 2.680 2.160 2.050 1.680 2.630 6.420 2.840
3 4.160 12.400 5.100 5.160 2.790 2.790 2.210 2.050 1.580 1.630 5.680 2.790
4 3.840 32.800 9.840 5.260 2.790 2.790 2.210 2.210 2.160 2.000 6.790 2.680
5 4.160 14.000 12.000 5.740 2.950 2.790 2.160 2.000 2.000 1.790 7.050 6.420
6 3.890 9.790 6.740 6.310 2.630 2.890 2.260 1.580 1.160 2.160 17.800 6.310
7 4.000 7.950 5.950 6.470 2.790 2.790 2.260 1.950 1.420 2.470 10.500 4.050
8 4.000 7.740 6.100 6.530 2.630 2.890 2.260 2.160 1.890 2.110 7.370 2.740
9 3.890 7.630 6.000 7.890 2.790 2.890 2.260 2.370 2.050 2.580 4.950 3.160
10 3.530 16.400 5.260 7.950 2.680 3.000 2.160 1.680 2.050 1.470 3.580 2.740
11 3.470 18.500 5.370 6.310 4.050 2.530 2.530 1.580 1.530 2.110 3.740 2.840
12 4.210 12.300 5.530 5.890 3.890 2.790 2.530 1.470 1.530 1.840 3.580 2.840
13 3.890 15.200 6.000 6.160 3.740 3.000 2.160 2.210 1.530 1.840 3.580 2.680
14 3.580 9.580 5.630 5.260 3.680 2.840 2.110 1.530 1.420 1.890 3.580 3.950
15 3.840 7.520 5.790 4.950 3.740 2.370 2.160 1.160 1.950 2.160 3.580 3.000
16 4.000 6.840 6.100 3.950 4.050 2.580 2.210 1.470 1.470 1.530 3.530 3.840
17 3.680 6.100 8.630 3.950 3.740 2.470 2.210 1.580 1.580 1.470 3.050 4.530
18 3.530 5.740 7.470 4.210 3.100 2.370 2.320 1.580 1.630 2.000 2.630 6.160
19 3.890 5.630 14.300 3.950 2.840 2.260 2.530 1.680 1.580 2.110 2.790 10.600
20 4.160 6.050 10.800 3.950 2.950 2.370 2.320 1.370 2.000 2.160 2.840 9.630
21 3.050 6.160 8.160 4.000 3.000 2.210 2.160 1.530 1.890 2.680 2.740 8.370
22 2.890 6.000 5.890 4.050 3.000 2.260 2.110 1.160 2.050 2.530 2.680 8.840
23 8.310 5.530 6.000 3.840 2.890 2.260 2.160 2.000 2.160 2.050 2.740 7.470
24 34.600 4.950 5.530 3.840 4.320 2.260 2.160 1.470 2.000 2.790 2.790 6.370
25 23.700 4.630 5.210 3.740 3.790 2.210 2.050 1.890 1.530 2.680 2.790 4.950
26 8.310 4.740 5.160 3.530 4.260 2.210 1.370 2.260 1.630 5.840 3.420 4.370
27 6.370 5.160 5.260 3.680 5.260 2.160 2.210 2.320 1.530 5.000 2.680 3.680
28 6.310 5.420 4.890 3.530 4.000 2.260 2.320 1.740 2.260 3.260 2.680 3.680
29 5.420 4.950 2.890 3.210 2.210 2.160 1.530 2.260 3.680 2.630 4.630
30 9.580 5.370 2.530 3.000 2.320 2.000 2.110 2.630 5.210 2.680 3.680
31 12.700 5.470 2.740 1.420 1.530 4.740 4.210
Average 6.399 9.307 6.600 4.866 3.322 2.545 2.173 1.769 1.793 2.599 4.538 4.735
Lowest 2.890 4.630 4.890 2.530 2.630 2.160 1.370 1.160 1.160 1.470 2.630 2.680
Highest 34.600 32.800 14.300 7.950 5.260 3.000 2.530 2.370 2.630 5.840 17.800 10.600
Monthly total
(million cu m) 17.14 22.51 17.68 12.61 8.90 6.60 5.82 4.74 4.65 6.96 11.76 12.68
Nat'ised
runoff (mm) 17 22 17 12 9 6 6 5 4 7 11 12
Rainfall (mm) 63 28 36 30 66 10 56 53 36 104 48 66
STATISTICS OF MONTHLY DATA FOR Oct 1883 TO Feb 2010 EXCLUDING 1942 (Incomplete or missing months total 1.9 years)
Mean Avg. 8.539 8.450 7.446 6.016 4.971 3.836 3.173 2.951 2.908 3.981 5.500 7.022
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 51 53 56 55 63 66 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) 1942
For 1942 For record As % of $ Flow influenced by groundwater abstraction
preceding 1942 pre-1942 and/or recharge.
Mean flow 4.187 5.386 78 $ 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 1.769 Aug 0.801 Aug 1949 $ Augmentation from effluent returns.
Highest monthly mean 9.307 Feb 30.700 Mar 1947
Lowest daily mean 1.160 15 Aug 0.579 4 Sep 1949
Highest daily mean 34.600 24 Jan 119.000 17 Mar 1947
10% exceedance 7.403 9.477 78
50% exceedance 2.947 3.764 78
95% exceedance 1.537 1.590 97
Annual total (million cu m) 132.00 170.00 78
Annual runoff (mm) 127 164 78
Annual rainfall (mm) 596 643 93
{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.
In line with Natural Environment Research Council policy, the provision of data from the National River Flow Archive confers only a right to use the data. Ownership of the data, or the associated Intellectual Property Rights, will not normally be transferred. Data received from the NRFA must not be sold, or passed on to any third party. Reproduction is authorised, except for commercial purposes, provided the sources is acknowledged.
Through the use of quality control procedures every effort is made to maintain and improve the quality of data. However, NERC, the Environment Agency, the Scottish Environment Protection Agency and the Rivers Agency accepts no liability for any loss or damage, cost or claims arising directly or indirectly their use.