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Engineering Hydrology
Basin Lag in Synthetic Unit Hydrograph Formulas
Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall. And is denoted by t
p
. Basin Lag is usually measured using the Hour for Time. Note that the value of Basin Lag is always positive.
Formulas to find Basin Lag in Synthetic Unit Hydrograph
f
x
Basin Lag given Modified Basin Lag
Go
f
x
Basin Lag given Modified Basin Lag for Effective Duration
Go
f
x
Basin Lag given Standard Duration of Effective Rainfall
Go
f
x
Basin Lag given Peak Discharge
Go
f
x
Snyder's Equation
Go
f
x
Modified Equation for Basin Lag
Go
f
x
Lag Time given Time of Peak
Go
Synthetic Unit Hydrograph formulas that make use of Basin Lag
f
x
Basin Length Measured along Water Course given Basin Lag
Go
f
x
Distance along Main Water Course from Gauging Station given Basin Lag
Go
f
x
Regional Constant representing Watershed Slope and Storage Effects
Go
f
x
Basin Length Measured along Water Course given Modified Equation for Basin Lag
Go
f
x
Distance along Main Water Course from Gauging Station to Watershed
Go
f
x
Basin Slope given Basin Lag
Go
f
x
Snyder's Equation for Standard Duration of Effective Rainfall
Go
f
x
Snyder's Equation for Peak Discharge
Go
f
x
Catchment Area given Peak Discharge of Unit Hydrograph
Go
f
x
Regional Constant given Peak Discharge
Go
f
x
Modified Basin Lag for Effective Duration
Go
f
x
Non-Standard Rainfall Duration given Modified Basin Lag
Go
f
x
Standard Duration of Effective Rainfall given Modified Basin Lag
Go
f
x
Modified Equation for Basin Lag for Effective Duration
Go
f
x
Standard Effective Duration given Modified Basin Lag
Go
f
x
Time of Peak or Time of Rise
Go
f
x
Duration of Effective Rainfall given Time of Peak
Go
List of variables in Synthetic Unit Hydrograph formulas
f
x
Modified Basin Lag
Go
f
x
Non-standard rainfall duration
Go
f
x
Standard Duration of Effective Rainfall
Go
f
x
Regional Constant (Snyder)
Go
f
x
Area of Catchment
Go
f
x
Peak Discharge
Go
f
x
Regional Constant
Go
f
x
Length of Basin
Go
f
x
Distance along Main Water Course
Go
f
x
Basin Constant
Go
f
x
Basin Slope
Go
f
x
Basin Constant 'n'
Go
f
x
Time of Peak
Go
FAQ
What is the Basin Lag?
Basin Lag is the elapsed time between the occurrences of the centroids of the effective rainfall. Basin Lag is usually measured using the Hour for Time. Note that the value of Basin Lag is always positive.
Can the Basin Lag be negative?
No, the Basin Lag, measured in Time cannot be negative.
What unit is used to measure Basin Lag?
Basin Lag is usually measured using the Hour[h] for Time. Second[h], Millisecond[h], Microsecond[h] are the few other units in which Basin Lag can be measured.
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