The impact of urban groundwater upon surface water - eTheses ...

HCO3 -
Determinant
Mean Groundwater Concentration* 1
mgl -1
Median Groundwater Concentration* 1
mgl -1
Groundwater baseflow discharge from the
Maximum
m 3 d -1
(7.4 km )study reach * 2
Mean
m 3 d -1
Minimum
m 3 d -1
Years Total
(1999)
m 3 yr -1
40700 19240 12580 8861345
Mass Flux from the Groundwater
(calculated from mean groundwater concentrations)
Maximum
kgd -1
Mean
kgd -1
Minimum
kgd -1
Years Total
kgyr -1
371 299 15093 7135 4665 3286063
F 23 1 926 438 286 201714
Cl 143 62 5835 2759 1804 1270514
NO3 58 24 2363 1117 730 514509
SO4 215 162 8746 4135 2703 1904280
Ca 147 135 5988 2831 1851 1303781
K 15 16 591 279 183 128641
Mg 22 20 886 419 274 192837
Na 91 62 3686 1743 1139 802574
Mn 3 2 128 61 40 27928
Fe 1 0 57 27 18 12503
Ba 0.11 0.09 4.5 2.1 1.4 988
Al 4.3 29.9 177 83 55 38449
Pb 0.0062 0.0020 0.25 0.12 0.08 55
Hg 0.00003 0.00002 0.0013 0.00061 0.00040 0.3
Cd 0.00065 0.00062 0.026 0.012 0.008 6
Cr 0.0024 0.0018 0.098 0.046 0.030 21
As 0.0031 0.0032 0.126 0.060 0.039 27
Cu 0.012 0.006 0.486 0.23 0.150 106
Zn 0.081 0.037 3.30 1.56 1.02 719
Ni 0.044 0.027 1.79 0.85 0.55 390
TCE 0.0107 0.0006 0.44 0.21 0.14 95
cis-1,2-DCE 0.0026 0.0019 0.108 0.051 0.033 23
PCE 0.0003 0.0002 0.0106 0.0050 0.0033 2
TCM 0.0015 0.0031 0.059 0.028 0.018 13
1,1-DCA 0.0013 0.0005 0.052 0.024 0.016 11
1,1,1-TCA 0.0092 0.0440 0.38 0.18 0.12 82
* 1 Values taken from riverbed piezometer sampling 2001.
* 2 Values from baseflow analyses of gauging station data 1999.
Table 8.1 Estimated geochemical mass flux from the groundwater to the study reach.