The 'unit hydrograph' theory assumes that for a given catchment:
Choose the correct answer
All rainfall becomes runoff without loss
Linear, time-invariant response: direct runoff = unit hydrograph × rainfall excess; same UH for all storms of same duration
The catchment is always rectangular
Baseflow is included in the unit hydrograph
Correct Answer
B. Linear, time-invariant response: direct runoff = unit hydrograph × rainfall excess; same UH for all storms of same duration
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Unit Hydrograph (UH) theory: (1) Linearity — runoff from any rainfall excess = UH × excess rainfall depth; (2) Time-invariance — same UH for same duration, regardless of when storm occurs; (3) The UH represents 1 unit (mm or cm) of direct runoff from uniform rainfall of specified duration D over the catchment. Used to derive flood hydrograph from design storm.
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