K
10
L
The length of flow in feet
L
The length (width) of the spillway in m (ft)
L a
Leakage and refers to ground water flow into or out of mercury
n
The number of events (m is the order of magnitude of a particular event)
O
The excess rainfall in in/h
p
The porosity, which is equal to the ratio of the pore void or interstitial
space to the total volume of the rock or soil
P a
The atmospheric pressure
P m
The monthly percent of daytime hours of the year
P t
Precipitation
Q
The rate of runoff at a given location and time
Q
The discharge in m
3 /d (gal/min)
Q
The rate of discharge in m
3 /s (cfs)
Q b
The net energy loss by long-wave radiation to the atmosphere
Q r
The reflected solar and sky short-wave radiation incident at the water
surface
Q s
The solar and sky short-wave radiation incident at the water surface
Q v
The net energy advected to the water which is the difference
Q θ
The increase in energy stored in the water
R 0
Runoff
s
Slope in ft/ft
S
Storage
Sc
The coefficient of storage as a decimal
STEM Science, technology, engineering, and mathematics
t
The duration of rainfall in minutes
T
The coefficient of transmissibility in m
3 /d unit gradient (gal/day (ft/ft))
t
The time of pumping in days
T a
The temperature of the air in
C
T m
The mean monthly temperature in
F
T s
The temperature of the water surface in
C
U
The consumptive use in inches per period (usually a month)
u
A tabulated value in the Theis method
V a
The vapor pressure of the air or dewpoint temperature, in inches of
mercury
V s
The vapor pressure of the water surface in inches of mercury
w
The wind velocity 30 ft above the surface in mi/h
W(u)
Theis’ well function value
ρ
The density of the water
6 Basic Hydrology, Water Resources, and DAF Boat Plant for Lake Restoration
231
10
L
The length of flow in feet
L
The length (width) of the spillway in m (ft)
L a
Leakage and refers to ground water flow into or out of mercury
n
The number of events (m is the order of magnitude of a particular event)
O
The excess rainfall in in/h
p
The porosity, which is equal to the ratio of the pore void or interstitial
space to the total volume of the rock or soil
P a
The atmospheric pressure
P m
The monthly percent of daytime hours of the year
P t
Precipitation
Q
The rate of runoff at a given location and time
Q
The discharge in m
3 /d (gal/min)
Q
The rate of discharge in m
3 /s (cfs)
Q b
The net energy loss by long-wave radiation to the atmosphere
Q r
The reflected solar and sky short-wave radiation incident at the water
surface
Q s
The solar and sky short-wave radiation incident at the water surface
Q v
The net energy advected to the water which is the difference
Q θ
The increase in energy stored in the water
R 0
Runoff
s
Slope in ft/ft
S
Storage
Sc
The coefficient of storage as a decimal
STEM Science, technology, engineering, and mathematics
t
The duration of rainfall in minutes
T
The coefficient of transmissibility in m
3 /d unit gradient (gal/day (ft/ft))
t
The time of pumping in days
T a
The temperature of the air in
C
T m
The mean monthly temperature in
F
T s
The temperature of the water surface in
C
U
The consumptive use in inches per period (usually a month)
u
A tabulated value in the Theis method
V a
The vapor pressure of the air or dewpoint temperature, in inches of
mercury
V s
The vapor pressure of the water surface in inches of mercury
w
The wind velocity 30 ft above the surface in mi/h
W(u)
Theis’ well function value
ρ
The density of the water
6 Basic Hydrology, Water Resources, and DAF Boat Plant for Lake Restoration
231