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The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, is
- a)the slope of the 1- hour unit hydrograph at that time
- b)the slope of the direct runoff unit hydrograph at that time
- c)difference in the slope of the S-curve and 1- hour unit hydrograph
- d)the slope of the S- curve with effective rainfall intensity of 1 cm/hr
Correct answer is option 'D'. Can you explain this answer?
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The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchmen...
Explanation:
The Instantaneous Unit Hydrograph (IUH) is a hydrological concept used to estimate the response of a catchment to a unit input of effective rainfall. It represents the relationship between the input rainfall excess and the resulting direct runoff at a specific time. The IUH is typically derived from the unit hydrograph (UH), which represents the direct runoff hydrograph resulting from a unit input of effective rainfall uniformly distributed over a specific duration.
The ordinate of the IUH at any time t represents the magnitude of direct runoff at that time. Therefore, it is important to understand what influences the magnitude of direct runoff in order to determine the correct answer.
The correct answer is option 'D', which states that the ordinate of the IUH is the slope of the S-curve with an effective rainfall intensity of 1 cm/hr. This means that the magnitude of direct runoff at any time t can be determined by measuring the slope of the S-curve, which represents the cumulative rainfall excess over time.
Reasoning:
1. The slope of the 1-hour unit hydrograph at a specific time represents the rate of change of direct runoff over a one-hour duration. It does not provide information about the magnitude of direct runoff at that time.
2. The slope of the direct runoff unit hydrograph at a specific time represents the rate of change of direct runoff over the entire duration of the unit hydrograph. It does not provide information about the magnitude of direct runoff at that time.
3. The difference in slope between the S-curve and the 1-hour unit hydrograph represents the change in direct runoff magnitude over time. However, it does not directly provide the magnitude of direct runoff at a specific time.
4. The slope of the S-curve with an effective rainfall intensity of 1 cm/hr represents the rate of change of cumulative rainfall excess over time. This directly provides the magnitude of direct runoff at any time t.
Therefore, the correct answer is option 'D' - the ordinate of the IUH is the slope of the S-curve with an effective rainfall intensity of 1 cm/hr.
The Instantaneous Unit Hydrograph (IUH) is a hydrological concept used to estimate the response of a catchment to a unit input of effective rainfall. It represents the relationship between the input rainfall excess and the resulting direct runoff at a specific time. The IUH is typically derived from the unit hydrograph (UH), which represents the direct runoff hydrograph resulting from a unit input of effective rainfall uniformly distributed over a specific duration.
The ordinate of the IUH at any time t represents the magnitude of direct runoff at that time. Therefore, it is important to understand what influences the magnitude of direct runoff in order to determine the correct answer.
The correct answer is option 'D', which states that the ordinate of the IUH is the slope of the S-curve with an effective rainfall intensity of 1 cm/hr. This means that the magnitude of direct runoff at any time t can be determined by measuring the slope of the S-curve, which represents the cumulative rainfall excess over time.
Reasoning:
1. The slope of the 1-hour unit hydrograph at a specific time represents the rate of change of direct runoff over a one-hour duration. It does not provide information about the magnitude of direct runoff at that time.
2. The slope of the direct runoff unit hydrograph at a specific time represents the rate of change of direct runoff over the entire duration of the unit hydrograph. It does not provide information about the magnitude of direct runoff at that time.
3. The difference in slope between the S-curve and the 1-hour unit hydrograph represents the change in direct runoff magnitude over time. However, it does not directly provide the magnitude of direct runoff at a specific time.
4. The slope of the S-curve with an effective rainfall intensity of 1 cm/hr represents the rate of change of cumulative rainfall excess over time. This directly provides the magnitude of direct runoff at any time t.
Therefore, the correct answer is option 'D' - the ordinate of the IUH is the slope of the S-curve with an effective rainfall intensity of 1 cm/hr.
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The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchmen...
The limiting case of a unit hydrograph of zero duration is known as instantaneous unit hydrograph (IUH). The ordinate of one IUH at any time 't' is the slope of S-curve of intensity 1 cm/hr.
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The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, isa)the slope of the 1- hour unit hydrograph at that timeb)the slope of the direct runoff unit hydrograph at that timec)difference in the slope of the S-curve and 1- hour unit hydrographd)the slope of the S- curve with effective rainfall intensity of 1 cm/hrCorrect answer is option 'D'. Can you explain this answer?
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The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, isa)the slope of the 1- hour unit hydrograph at that timeb)the slope of the direct runoff unit hydrograph at that timec)difference in the slope of the S-curve and 1- hour unit hydrographd)the slope of the S- curve with effective rainfall intensity of 1 cm/hrCorrect answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 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 Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, isa)the slope of the 1- hour unit hydrograph at that timeb)the slope of the direct runoff unit hydrograph at that timec)difference in the slope of the S-curve and 1- hour unit hydrographd)the slope of the S- curve with effective rainfall intensity of 1 cm/hrCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t, isa)the slope of the 1- hour unit hydrograph at that timeb)the slope of the direct runoff unit hydrograph at that timec)difference in the slope of the S-curve and 1- hour unit hydrographd)the slope of the S- curve with effective rainfall intensity of 1 cm/hrCorrect answer is option 'D'. Can you explain this answer?.
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