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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 catchment...
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...
Explanation:
Instantaneous Unit Hydrograph (IUH) is a hydrograph of direct runoff from a unit depth of rainfall that is generated at an instant of time. It is a theoretical hydrograph and is used to estimate the direct runoff hydrograph for any given rainfall input. The ordinate of the IUH of a catchment at any time t is given by the slope of the S curve with effective rainfall intensity of 1 cm/hr.
The S curve is a cumulative distribution curve that represents the relationship between the rainfall excess and the direct runoff. It is obtained by plotting the cumulative rainfall excess on the x-axis and the cumulative direct runoff on the y-axis. The slope of the S curve at any point represents the ratio of the direct runoff to the rainfall excess at that point.
The Effective rainfall intensity is the rainfall intensity that produces the same amount of direct runoff as the excess rainfall. It is obtained by dividing the total direct runoff by the total rainfall excess.
Therefore, the ordinate of the IUH of a catchment at any time t is given by the slope of the S curve with an effective rainfall intensity of 1 cm/hr, because this is the rainfall intensity that produces a unit depth of direct runoff.
Hence, the correct answer is option 'D'.
Summary:
- Instantaneous Unit Hydrograph (IUH) is a theoretical hydrograph that estimates the direct runoff hydrograph for any given rainfall input.
- The ordinate of the IUH of a catchment at any time t is given by the slope of the S curve with an effective rainfall intensity of 1 cm/hr.
- The S curve is a cumulative distribution curve that represents the relationship between the rainfall excess and the direct runoff.
- The effective rainfall intensity is the rainfall intensity that produces the same amount of direct runoff as the excess rainfall.
Instantaneous Unit Hydrograph (IUH) is a hydrograph of direct runoff from a unit depth of rainfall that is generated at an instant of time. It is a theoretical hydrograph and is used to estimate the direct runoff hydrograph for any given rainfall input. The ordinate of the IUH of a catchment at any time t is given by the slope of the S curve with effective rainfall intensity of 1 cm/hr.
The S curve is a cumulative distribution curve that represents the relationship between the rainfall excess and the direct runoff. It is obtained by plotting the cumulative rainfall excess on the x-axis and the cumulative direct runoff on the y-axis. The slope of the S curve at any point represents the ratio of the direct runoff to the rainfall excess at that point.
The Effective rainfall intensity is the rainfall intensity that produces the same amount of direct runoff as the excess rainfall. It is obtained by dividing the total direct runoff by the total rainfall excess.
Therefore, the ordinate of the IUH of a catchment at any time t is given by the slope of the S curve with an effective rainfall intensity of 1 cm/hr, because this is the rainfall intensity that produces a unit depth of direct runoff.
Hence, the correct answer is option 'D'.
Summary:
- Instantaneous Unit Hydrograph (IUH) is a theoretical hydrograph that estimates the direct runoff hydrograph for any given rainfall input.
- The ordinate of the IUH of a catchment at any time t is given by the slope of the S curve with an effective rainfall intensity of 1 cm/hr.
- The S curve is a cumulative distribution curve that represents the relationship between the rainfall excess and the direct runoff.
- The effective rainfall intensity is the rainfall intensity that produces the same amount of direct runoff as the excess rainfall.
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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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