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The D-hour unit hydrograph of a catchment may be obtained by dividing the ordinates of a single peak Direct Runoff Hydrograph (DRH) due to a storm of D-hour duration by the
- a)Total runoff volume (in cm)
- b)Direct runoff volume (in cm)
- c)Duration of DRH
- d)Total rainfall (in cm)
Correct answer is option 'B'. Can you explain this answer?
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The D-hour unit hydrograph of a catchment may be obtained by dividing ...
Understanding D-hour Unit Hydrograph
The D-hour unit hydrograph (UH) is a crucial tool in hydrology, representing the response of a catchment to a unit input of rainfall over a specific duration (D hours). To derive this hydrograph from a Direct Runoff Hydrograph (DRH), the ordinates of the peak DRH must be normalized.
Why Option B is Correct
To calculate the D-hour unit hydrograph, the ordinates of the DRH are divided by the direct runoff volume. Here’s why:
Why Other Options are Incorrect
In summary, dividing by the direct runoff volume allows for a clear understanding of the catchment's hydrological response, which is essential for effective water resource management.
The D-hour unit hydrograph (UH) is a crucial tool in hydrology, representing the response of a catchment to a unit input of rainfall over a specific duration (D hours). To derive this hydrograph from a Direct Runoff Hydrograph (DRH), the ordinates of the peak DRH must be normalized.
Why Option B is Correct
To calculate the D-hour unit hydrograph, the ordinates of the DRH are divided by the direct runoff volume. Here’s why:
- Direct Runoff Volume: This represents the total volume of water that contributes directly to streamflow from the storm event. It excludes baseflow and other contributions, focusing solely on runoff.
- Normalization: By dividing the ordinates of the peak DRH by the direct runoff volume, we get a per-unit response of the catchment. This helps in understanding how much runoff results from each unit of rainfall, making the UH a useful predictive tool for future storm events.
- Unit Hydrograph Concept: The essence of the unit hydrograph is to express the hydrograph in terms of a unit input (1 cm of direct runoff). This allows engineers to scale the response for different rainfall events by simply multiplying the UH by the corresponding direct runoff volume from a storm.
Why Other Options are Incorrect
- Total Runoff Volume: This includes both direct runoff and baseflow, which is not relevant for UH calculation.
- Duration of DRH: Dividing by this would not provide a meaningful normalization in the context of hydrological response.
- Total Rainfall: This does not accurately reflect the efficiency of the catchment in converting rainfall to runoff.
In summary, dividing by the direct runoff volume allows for a clear understanding of the catchment's hydrological response, which is essential for effective water resource management.
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The D-hour unit hydrograph of a catchment may be obtained by dividing the ordinates of a single peak Direct Runoff Hydrograph (DRH) due to a storm of D-hour duration by thea)Total runoff volume (in cm)b)Direct runoff volume (in cm)c)Duration of DRHd)Total rainfall (in cm)Correct answer is option 'B'. Can you explain this answer?
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