The unit hydrograph theory assumes:
Choose the correct answer
Variable base time for different storm durations
Time invariance and linearity: direct runoff hydrograph for same unit storm in same basin is always the same (time-invariant), and responses can be superposed
Runoff is always equal to rainfall
The hydrograph peak is always at t = tp = 0
Correct Answer
B. Time invariance and linearity: direct runoff hydrograph for same unit storm in same basin is always the same (time-invariant), and responses can be superposed
Why is this the answer?
Unit hydrograph (Sherman, 1932) assumptions: (1) Time invariance - unit hydrograph for a given basin is constant regardless of when unit storm occurs; (2) Linear superposition - response to multiple unit storms can be superposed; (3) Unit duration rainfall.
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