List of symbols

A	= area
	= branch of a river
	= buoyancy in kN
	= cross-section of flow
	= runoff during an observed period of time T
AE0	= precipitation area
	= total catchment area surface in m² or km²
Ai	= partial area of a partial catchment area in m² or km²
A1,2..	= partial area of station 1, 2 . .
a	= aerated area between tail water and top of the weir crest
	= calibrated parameter for current meter (given by manufacturer of the instrument)
	= height of the sluice opening
	= inside width between trash rack / sluice bars
	= coefficient dependent upon particle diameter
B, b	= width of weir, canal
b	= calibrated parameter for current meter (given by manufacturer of the instrument)
	= width of trash rack / screen
C	= concentration of suspended matter
Cs	= content of suspended matter
c	= correction coefficient
	= coefficient of resistance of particles
D	= equivalent diameter (4 F / U = 4 ·B ·h / (B +2h))
d	= distance between the trash rack / screen bars
	= particle diameter
E	= catchment area
F	= cross-sectional area
	= Froude's number
Fi	= individual surface fractions
fv	= velocity area
fvm	= mean velocity area
G	= weight of the structure in kN
g	= acceleration due to gravity = 9.81 m/s²
H	= horizontal forces
	= main stream, main river
HHQ	= highest discharge
HQ	= flood discharge
HQ100	= 100-yearly flood
HW	= high-water level
h	= depth of water at the vertical lines of measurement
	= elevation of water surface
	= impounding head
	= water level
hA	= runoff rate of the AEO during a certain period of time (T) in mm
hE	= energy head
hN	= height of precipitation above AEO during a certain period of time (T) in mm
	= heavy precipitation
hR	= retention rate in the AEO during a certain period of time (T) in mm
hV	= evaporation height in the AEO during a certain period of time (T) in mm
hm	= mean weir head
hü	= weir head
hüe	= head of diversion weir
hüs	= head of retaining weir
I	= slope, gradient
iN	= intensify of precipitation in mm/hour
k	= correction factor
kS	= roughness coefficient
L	= length of structure
	= length of trash rack / screen
l	= length of transition area (sand trap)
MMQ	= mean monthly discharges of all years observed
MQ	= mean monthly discharges of one year
MW	= mean water level
mG	= bed load movement
niG	= bed load transport
mGf	= bed load
mSf	= suspended matter load
rnSf	= suspended master transport
N	= precipitation
NG	= area precipitation
NNW	= lowest low-water level
NQ	= low discharge
NW	= low-water level
Ni	= precipitation of the station i
N1,2..	= point precipitation of station 1, 2 . . .
n	= correction coefficient
	= number of events
	= number of revolutions per unit of time
	= pore volume proportion
ni	= number of potential steps in flow direction up to the point i being sought
nS	= number of potential lines
	= number of potential steps
o	= index for headwater
PG	= bed load pressure
PSi	= seepage water pressure at a specific point i
Pu	= tail water pressure
Q	= discharge
QA	= discharge in the branch of a river
	= design discharge
QH	= discharge in the main river
Qü	= discharge capacity over the weir
R	= retention in the catchment area during T (interception, infiltration)
Re	' = Reynolds' number
rhy	= hydraulic radius
S	= seepage water pressure
s	= height of end sill
	= length of measurement section
	= density of particles due to density of water
T	= time, unit of time
	= recurrence interval
TK	= time of concentration in hours
TN	= duration of precipitation
TR	= duration of precipitation
t	= water depth
tan j	= friction coefficient
td	= time of passage
ts	= settling time, sinking time
U	= wetted perimeter
	= tail water pressure
u	= index for tail water
V	= evaporation above the catchment area during T
	= vertical forces
VQ	= estimated discharge
v	= flow velocity
vA	= flow velocity in the diversion canal
vE	= flow velocity in, the settling basin
vz	= flow velocity in the inlet canal
vd	= flow velocity in the settling basin
vi	= individual velocity values
vm	= mean flow velocity
vS	= settling/sinking velocity of particles
vS'	= mean settling/sinking velocity of particles
WG	= height of the amount of bed load
WH	= horizontal water pressure
WH1e	= horizontal water pressure in the headwater
WHr	= horizontal water pressure in the tail water
WV	= water surcharge on the structure
We	= height of diversion weir
WS	= height of retaining weir
w	= weir crest height
	= dynamic buoyancy due to turbulent flow
x	= calibration factor
a	= angle of curvature / bend
	= velocity coefficient
b	= angle of inclination
gF	= specific weight of solid matter particles
gG	= specific weight of bed load
gS	= specific weight of particles / grains
gW	= specific weight of water
D	= difference
DZel	= difference of energy heads
d	= contraction coefficient
m	= discharge coefficient
	= weir coefficient
mX	= reduced weir coefficient
j	= retardation coefficient
n	= kinematic viscosity of the water
nG	= stability against sliding
y	= runoff coefficient, discharge coefficient
l	= loss coefficient