k coefficient (of permeability), effective pipe roughness, wave
number
K bulk modulus, channel conveyance, coefficient
Kc Keulegan–Carpenter number
l length
L length, wavelength
m mass
mv coefficient of volume compressibility
M moment
n Manning roughness coefficient
N hydraulic exponent speed in rev/min
Nd number of increments of potential in flownet
Nf number of flow channels in flownet
Ns specific speed
NWL normal water level
O outflow
p number of poles, pressure intensity
pv vapour pressure
P force, power, wetted perimeter
q specific discharge
Q discharge
Qs discharge of sediment
r factor, radius
ru pore pressure ratio
R hydraulic radius, resistance, resultant, radius
Re Reynolds number
Rs régime scour depth
S maximum shearing resistance, slope
Sc critical slope
Sf friction slope
S 0 bed slope
Sh Strouhal number
SWL still water level
t thickness, time
T draught, time, wave period
u local velocity (xdirection)
uw porewater pressure
U wind speed
U* shear velocity
velocity (general), velocity (ydirection)
V mean cross-sectional velocity, storage, volume
Vc critical velocity
w moisture content, velocity (zdirection)
ws sediment fall velocity
W régime width, weight
MAIN SYMBOLS xxiii