Question:
An instantaneous unit hydrograph is assumed to have the duration of rainfall occurrence as:
An instantaneous unit hydrograph is assumed to have the duration of rainfall occurrence as:
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The Instantaneous Unit Hydrograph (IUH) is a powerful theoretical tool in hydrology. It represents the impulse response of a catchment. All other hydrographs for any rainfall duration can be derived from the IUH through convolution.
Updated On: Sep 25, 2025
- 1 hour
- 0.5 hour
- 0.1 hour
- Zero hour
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The Correct Option is D
Solution and Explanation
Step 1: Define an Instantaneous Unit Hydrograph (IUH).
An IUH is a conceptual hydrograph that represents the response of a watershed to a unit amount (1 cm) of effective rainfall applied instantaneously over the entire catchment area.
Step 2: Determine the duration of rainfall for an IUH. The term "instantaneously" implies that the rainfall event occurs over an infinitesimally small period. Therefore, the duration of the rainfall occurrence is assumed to be zero. The IUH is a theoretical concept derived by making the duration of the unit hydrograph approach zero.
Step 2: Determine the duration of rainfall for an IUH. The term "instantaneously" implies that the rainfall event occurs over an infinitesimally small period. Therefore, the duration of the rainfall occurrence is assumed to be zero. The IUH is a theoretical concept derived by making the duration of the unit hydrograph approach zero.
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