[–]
|
activity
|
mol kg−1
|
|
(–)
|
concentration (see Box 4.1)
|
mol L−1 or mg L−1
|
|
A
|
area
|
m2
|
|
A
|
radionuclide activity
|
|
|
AE
|
actual evapotranspiration
|
mm
|
|
ASR
|
artificial storage and recovery
|
|
|
(aq)
|
aqueous species
|
|
|
atm
|
atmosphere (pressure)
|
|
|
B
|
barometric efficiency
|
|
|
BOD
|
biological oxygen demand
|
mg L−1
|
|
Bq
|
becquerel (unit of radioactivity; 1 Bq = 1 disintegration per second)
|
|
|
b
|
aquifer thickness
|
m
|
|
2b
|
fracture aperture
|
m
|
|
C
|
Sediment loading efficiency
|
|
|
C
|
shape factor for determining ki
|
|
|
C
|
specific moisture capacity of a soil
|
(m of water)−1
|
|
C, c
|
concentration
|
|
|
°C
|
degrees Celsius (temperature)
|
|
|
CEC
|
cation exchange capacity
|
meq (100 g)−1
|
|
CFC
|
chlorofluorocarbon
|
|
|
Ci
|
curie (older unit of radioactivity; 1 Ci = 3.7 × 1010 disintegrations per second)
|
|
|
COD
|
chemical oxygen demand
|
mg L−1
|
|
D
|
hydraulic diffusivity
|
m2 s−1
|
|
D
|
hydrodynamic dispersion coefficient
|
m2 s−1
|
|
D*
|
molecular diffusion coefficient
|
m2 s−1
|
|
DIC
|
dissolved inorganic carbon
|
mg L−1
|
|
DNAPL
|
dense, non‐aqueous phase liquid
|
|
|
DOC
|
dissolved organic carbon
|
mg L−1
|
|
d
|
mean pore diameter
|
m
|
|
|
hydraulic gradient
|
|
|
E o
|
standard electrode potential
|
V
|
|
EC
|
electrical conductivity
|
S cm−1
|
|
Eh
|
redox potential
|
V
|
|
e
|
void ratio
|
|
|
e‐
|
electron
|
|
|
eq
|
chemical equivalent (see Box 4.1)
|
eq L−1
|
|
F
|
Faraday constant (9.65 × 104 C mol−1)
|
|
|
F
|
Darcy–Weisbach friction factor
|
|
|
f c
|
infiltration capacity
|
cm h−1
|
|
f t
|
infiltration rate
|
cm h−1
|
|
f oc
|
weight fraction organic carbon content
|
|
|
G
|
Gibbs free energy
|
kJ mol−1
|
|
g
|
gravitational acceleration
|
m s−2
|
|
g
|
gram (mass)
|
|
|
(g)
|
gas
|
|
|
H
|
depth (head) of water measured at a flow gauging structure
|
m
|
|
H
|
enthalpy
|
kJ mol−1
|
|
h
|
hydraulic head
|
m
|
|
I
|
ionic strength
|
mol L−1
|
|
i
|
hydraulic gradient
|
|
|
IAEA
|
International Atomic Energy Agency
|
|
|
