JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II HYDROLOGY Previous Question Paper (April/May - 2023 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
PART - A
Explain the terms Mass curve and Double mass curve.
Answer
A Mass curve is a cumulative plot of total rainfall or runoff against time, used to determine the storage capacity of a reservoir. A Double mass curve is a graphical technique used to check the consistency of rainfall data at a station by plotting the cumulative annual rainfall of the station against the cumulative average of neighboring stations.
What is hydrological cycle and its components?
Answer
The Hydrological cycle is the continuous movement of water on, above, and below the surface of the Earth. Its primary components include evaporation, transpiration, precipitation, infiltration, and runoff.
Mention any two methods of separating base flow from total runoff.
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Define φ-index and W-index and bring out the difference between them.
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What is peak runoff estimation?
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What is the runoff curve number method?
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What is a unit-hydrograph?
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How unit hydrograph can be used to predict the runoff from storms.
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What is S-Hydrograph?
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Explain in brief about three methods of flood forecasting.
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PART - B
Enumerate the different types of rain gauges, and describe with a neat sketch, the construction and functioning of the non-recording type of gauge.
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A major river basin is divided into four sub basins with areas of 920, 705, 1075 and 1665 Km2. If the average annual rain fall on these sub-basins is 73, 85, 112 and 100 cm respectively. What is the average annual rain fall for the basin as a whole?
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How is the double mass-curve technique used to check the consistency and adjust the rain fall record at a station?
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Explain with sketches the following methods for calculating net storm rain:
Infiltration capacity method
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Φ-index method
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W-index method.
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Describe about Runoff and its types, components and characteristics.
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Write short notes on: Rainfall-runoff relationship
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Factors affecting runoff.
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A catchment has an area of 500ha. The average slope of the land surface is 0.5% and the maximum travel depth of rain fall in the catchment is approximately 2km. The maximum depth of rainfall in the area with a return period of 25 years is as tabulated below:
| Time duration (min) | 5 | 10 | 15 | 20 | 25 | 30 | 40 | 60 |
|---|---|---|---|---|---|---|---|---|
| Rain fall depth (mm) | 15 | 25 | 32 | 45 | 50 | 53 | 60 | 65 |
Consider that 200ha of the catchment area has cultivated sandy loam soil(C=0.2) and 300ha has light clay cultivated soil (C=0.7). Determine the peak flow rate of runoff by using the rational method.
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Enlist the uses and limitations of unit hydrograph theory.
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What are the assumptions of unit hydrograph theory?
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Derive the unit hydrograph from a complex storm.
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What are the different Methods of Flood Routing? Explain about Modified Plus method.
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Given below are the ordinates of 4 hr UH of a basin. Derive 2 hr UH of the basin using S-curve method.
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