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An instantaneous unit hydrograph is a direct runoff hydrograph
- a)of 1 cm magnitude due to a rainfall excess of 1-h duration
- b)that occurs instantaneously due to a unit rainfall excess of duration-D h
- c)of unit rainfall excess precipitating instantaneously over the catchment
- d)occurring at any instant in a long storm
Correct answer is option 'C'. Can you explain this answer?
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An instantaneous unit hydrograph is a direct runoff hydrographa)of 1 c...
A finite unit hydrograph is indicated as the duration D → 0. The limiting case of a unit hydrograph of zero duration is known as Instantaneous Unit Hydrograph (IUH).
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An instantaneous unit hydrograph is a direct runoff hydrographa)of 1 c...
Explanation:
An instantaneous unit hydrograph is a hydrograph that represents the direct runoff response of a catchment to a unit rainfall excess that occurs instantaneously over the catchment. It is a fundamental concept in hydrology and is widely used in the analysis and design of stormwater management systems.
Key Points:
- Direct Runoff: An instantaneous unit hydrograph represents the direct runoff component of the total streamflow. It does not include the baseflow component, which is the groundwater contribution to streamflow.
- Unit Rainfall Excess: The unit rainfall excess refers to a rainfall excess of a unit magnitude, such as 1 cm or 1 inch. It is the portion of rainfall that exceeds the infiltration capacity of the catchment and directly contributes to streamflow.
- Instantaneous Precipitation: The unit rainfall excess is assumed to occur instantaneously over the catchment. This means that the entire unit excess rainfall is assumed to be applied to the catchment at a single point in time.
- Catchment Response: The instantaneous unit hydrograph represents the response of the catchment to the unit rainfall excess. It shows how the streamflow hydrograph changes over time in response to the input of rainfall.
- Duration: The instantaneous unit hydrograph does not have a specific duration. It is a theoretical concept that represents the response of a catchment to a unit rainfall excess regardless of the duration of the excess rainfall.
Conclusion:
In summary, an instantaneous unit hydrograph is a hydrograph that represents the direct runoff response of a catchment to a unit rainfall excess that occurs instantaneously over the catchment. It is a theoretical concept that helps in understanding the relationship between rainfall and streamflow in a catchment.
An instantaneous unit hydrograph is a hydrograph that represents the direct runoff response of a catchment to a unit rainfall excess that occurs instantaneously over the catchment. It is a fundamental concept in hydrology and is widely used in the analysis and design of stormwater management systems.
Key Points:
- Direct Runoff: An instantaneous unit hydrograph represents the direct runoff component of the total streamflow. It does not include the baseflow component, which is the groundwater contribution to streamflow.
- Unit Rainfall Excess: The unit rainfall excess refers to a rainfall excess of a unit magnitude, such as 1 cm or 1 inch. It is the portion of rainfall that exceeds the infiltration capacity of the catchment and directly contributes to streamflow.
- Instantaneous Precipitation: The unit rainfall excess is assumed to occur instantaneously over the catchment. This means that the entire unit excess rainfall is assumed to be applied to the catchment at a single point in time.
- Catchment Response: The instantaneous unit hydrograph represents the response of the catchment to the unit rainfall excess. It shows how the streamflow hydrograph changes over time in response to the input of rainfall.
- Duration: The instantaneous unit hydrograph does not have a specific duration. It is a theoretical concept that represents the response of a catchment to a unit rainfall excess regardless of the duration of the excess rainfall.
Conclusion:
In summary, an instantaneous unit hydrograph is a hydrograph that represents the direct runoff response of a catchment to a unit rainfall excess that occurs instantaneously over the catchment. It is a theoretical concept that helps in understanding the relationship between rainfall and streamflow in a catchment.
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An instantaneous unit hydrograph is a direct runoff hydrographa)of 1 cm magnitude due to a rainfall excess of 1-h durationb)that occurs instantaneously due to a unit rainfall excess of duration-D hc)of unit rainfall excess precipitating instantaneously over the catchmentd)occurring at any instant in a long stormCorrect answer is option 'C'. Can you explain this answer?
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