Page 16 - Hydrogeology Principles and Practice

HYDA01 12/5/05 5:44 PM Page xv

Symbols and Abbreviations xv

Symbol Description Units

n an integer
n roughness coefficient (Manning’s n)
n porosity
n e effective porosity
P Peclet number
P precipitation amount mm
−2
P pressure Pa (or N m )
P partial pressure atm or Pa
P , P o atmospheric pressure atm or Pa
A
Pa pascal (pressure)
P w porewater pressure Pa or m of water
PAH polycyclic aromatic hydrocarbon
PDB Pee Dee Belemnite
PE potential evapotranspiration mm
p −log 10
ppm parts per million
3 −1
Q discharge m s
3 −1
Q f fracture flow discharge m s
q specific discharge or darcy velocity m s −1
R hydraulic radius m
R (R ) recharge (direct recharge) mm a −1
d
−1
−1
R universal gas constant (8.314 J mol K )
RC root constant mm
R d retardation factor
R e Reynolds number
rem roentgen equivalent man (older unit of dose equivalent; 1 rem = 0.01 Sv)
−1
S entropy J mol K −1
S sorptivity of soil cm (min) −1/2
S storativity
S slope
S p specific retention
S s specific storage s −1
S sp specific surface area m −1
S y specific yield
SMD soil moisture deficit mm
STP standard temperature and pressure of gases (0°C, 1 atmosphere pressure)
Sv sievert (unit of dose equivalent that accounts for the relative biological
effects of different types of radiation; 1 Sv = 100 rem)
s groundwater level drawdown m
−1
s solubility g (100 g) solvent
2 −1
T transmissivity m s
T absolute temperature K
TDS total dissolved solids mg L −1
TOC total organic carbon mg L −1
t time s
t 1/2 radionuclide half-life s
V volume m 3
V volt (electrical potential)
V s volume of solid material m 3
VOC volatile organic compound
V SMOW Vienna Standard Mean Ocean Water
v groundwater or river water velocity m s −1
2 average linear velocity (groundwater) m s −1
2 c average linear contaminant velocity m s −1