rainfall duration
rainfall excess
time base of direct runoff
discharge
Answer is Right!
Answer is Wrong!
The correct answer is: D. discharge
A unit hydrograph is a hydrograph that has been normalized to have a unit peak discharge. It is used to estimate the peak discharge of a flood event from the rainfall data. The unit hydrograph is constructed by dividing the peak discharge of a flood event by the rainfall excess, which is the difference between the rainfall and the infiltration. The time base of the unit hydrograph is the time it takes for the peak discharge to occur.
The other options
are incorrect because:- Rainfall duration is the length of time that rain falls.
- Rainfall excess is the difference between the rainfall and the infiltration.
- Time base of direct runoff is the time it takes for the direct runoff to reach the stream.