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The ordinate of the IUH of a catchment at any time t is the
- a)slope of the 1-hour UH at that time
- b)slope of the ERH at that time
- c)slope of the S-curve of intensity 1 cm/h
- d)difference in the slopes of the S-curve and 1 -hour UH at that time
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The ordinate of the IUH of a catchment at any time t is thea)slope of ...
Understanding IUH and Its Ordinate
The Instantaneous Unit Hydrograph (IUH) is a crucial concept in hydrology used to model the response of a catchment to a unit input of rainfall over a short duration. The ordinate of the IUH at any time 't' represents a key aspect of this response.
What Does the Ordinate Represent?
- The ordinate of the IUH reflects how much runoff is generated at a specific time due to a unit input (usually 1 cm of rainfall) over a given duration.
- In the context of option 'C', it specifically refers to the slope of the S-curve of intensity 1 cm/h.
Understanding the S-Curve
- The S-curve represents the cumulative runoff over time from a unit input of rainfall.
- The slope of the S-curve indicates the rate of change of runoff with respect to time, which is essential for understanding how quickly the catchment responds to rainfall.
Why Option C is Correct
- When considering a rainfall intensity of 1 cm/h, the slope of the S-curve at any time 't' provides insight into the instantaneous runoff generated by that intensity.
- The IUH is derived from this concept, as it describes the instantaneous response to a unit input, making the slope of the S-curve at 1 cm/h a direct reflection of the IUH at that moment.
Conclusion
In summary, the ordinate of the IUH at any time 't' is correctly identified by option 'C' because it indicates the slope of the S-curve for a 1 cm/h rainfall intensity, illustrating the immediate catchment response to rainfall inputs. Understanding this relationship is fundamental for effective hydrological modeling and flood forecasting.
The Instantaneous Unit Hydrograph (IUH) is a crucial concept in hydrology used to model the response of a catchment to a unit input of rainfall over a short duration. The ordinate of the IUH at any time 't' represents a key aspect of this response.
What Does the Ordinate Represent?
- The ordinate of the IUH reflects how much runoff is generated at a specific time due to a unit input (usually 1 cm of rainfall) over a given duration.
- In the context of option 'C', it specifically refers to the slope of the S-curve of intensity 1 cm/h.
Understanding the S-Curve
- The S-curve represents the cumulative runoff over time from a unit input of rainfall.
- The slope of the S-curve indicates the rate of change of runoff with respect to time, which is essential for understanding how quickly the catchment responds to rainfall.
Why Option C is Correct
- When considering a rainfall intensity of 1 cm/h, the slope of the S-curve at any time 't' provides insight into the instantaneous runoff generated by that intensity.
- The IUH is derived from this concept, as it describes the instantaneous response to a unit input, making the slope of the S-curve at 1 cm/h a direct reflection of the IUH at that moment.
Conclusion
In summary, the ordinate of the IUH at any time 't' is correctly identified by option 'C' because it indicates the slope of the S-curve for a 1 cm/h rainfall intensity, illustrating the immediate catchment response to rainfall inputs. Understanding this relationship is fundamental for effective hydrological modeling and flood forecasting.
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The ordinate of the IUH of a catchment at any time t is thea)slope of the 1-hour UH at that timeb)slope of the ERH at that timec)slope of the S-curve of intensity 1 cm/hd)difference in the slopes of the S-curve and 1 -hour UH at that timeCorrect answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2026 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The ordinate of the IUH of a catchment at any time t is thea)slope of the 1-hour UH at that timeb)slope of the ERH at that timec)slope of the S-curve of intensity 1 cm/hd)difference in the slopes of the S-curve and 1 -hour UH at that timeCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The ordinate of the IUH of a catchment at any time t is thea)slope of the 1-hour UH at that timeb)slope of the ERH at that timec)slope of the S-curve of intensity 1 cm/hd)difference in the slopes of the S-curve and 1 -hour UH at that timeCorrect answer is option 'C'. Can you explain this answer?.
The ordinate of the IUH of a catchment at any time t is thea)slope of the 1-hour UH at that timeb)slope of the ERH at that timec)slope of the S-curve of intensity 1 cm/hd)difference in the slopes of the S-curve and 1 -hour UH at that timeCorrect answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2026 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about The ordinate of the IUH of a catchment at any time t is thea)slope of the 1-hour UH at that timeb)slope of the ERH at that timec)slope of the S-curve of intensity 1 cm/hd)difference in the slopes of the S-curve and 1 -hour UH at that timeCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The ordinate of the IUH of a catchment at any time t is thea)slope of the 1-hour UH at that timeb)slope of the ERH at that timec)slope of the S-curve of intensity 1 cm/hd)difference in the slopes of the S-curve and 1 -hour UH at that timeCorrect answer is option 'C'. Can you explain this answer?.
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