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The use of the unit hydrograph for estimating floods is limited to catchments of size less than
- a)5000 km2
- b)500 km2
- c)106 km2
- d)no upper limit
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The use of the unit hydrograph for estimating floods is limited to cat...
Understanding the Unit Hydrograph
The unit hydrograph is a crucial tool in hydrology for estimating flood responses in catchments. However, its applicability is influenced by catchment size.
Limitations of Catchment Size
- The unit hydrograph is primarily effective in small to medium-sized catchments.
- Flood estimation using a unit hydrograph is generally limited to catchments less than 5000 km².
Reasons for the Size Limit
- Homogeneity of Response: Smaller catchments tend to have more uniform rainfall and runoff characteristics, allowing the unit hydrograph to accurately represent the relationship between precipitation and streamflow.
- Time of Concentration: In larger catchments, the time it takes for water to travel from the furthest point to the outlet increases, leading to complexities in the response that a unit hydrograph cannot adequately capture.
- Variability in Land Use and Geography: Larger catchments often have diverse land uses, soil types, and topographies, resulting in varied hydrological responses that the unit hydrograph fails to account for.
Conclusion
Thus, while the unit hydrograph is a powerful tool for flood estimation, its effectiveness diminishes with increasing catchment size. For catchments larger than 5000 km², alternative methods that consider the complexities of larger systems are recommended.
The unit hydrograph is a crucial tool in hydrology for estimating flood responses in catchments. However, its applicability is influenced by catchment size.
Limitations of Catchment Size
- The unit hydrograph is primarily effective in small to medium-sized catchments.
- Flood estimation using a unit hydrograph is generally limited to catchments less than 5000 km².
Reasons for the Size Limit
- Homogeneity of Response: Smaller catchments tend to have more uniform rainfall and runoff characteristics, allowing the unit hydrograph to accurately represent the relationship between precipitation and streamflow.
- Time of Concentration: In larger catchments, the time it takes for water to travel from the furthest point to the outlet increases, leading to complexities in the response that a unit hydrograph cannot adequately capture.
- Variability in Land Use and Geography: Larger catchments often have diverse land uses, soil types, and topographies, resulting in varied hydrological responses that the unit hydrograph fails to account for.
Conclusion
Thus, while the unit hydrograph is a powerful tool for flood estimation, its effectiveness diminishes with increasing catchment size. For catchments larger than 5000 km², alternative methods that consider the complexities of larger systems are recommended.
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The use of the unit hydrograph for estimating floods is limited to catchments of size less thana)5000 km2b)500 km2c)106 km2d)no upper limitCorrect answer is option 'A'. Can you explain this answer? for Civil Engineering (CE) 2025 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 use of the unit hydrograph for estimating floods is limited to catchments of size less thana)5000 km2b)500 km2c)106 km2d)no upper limitCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The use of the unit hydrograph for estimating floods is limited to catchments of size less thana)5000 km2b)500 km2c)106 km2d)no upper limitCorrect answer is option 'A'. Can you explain this answer?.
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