GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018
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Subject Code:2150602 Date:11/12/2018Subject Name:Hydrology & Water Resources Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define: Evapo-transpiration, Precipitation, Infiltration 03
(b) What is a spillway? Explain functions of spillway. 04
(c) Discuss the various methods of determining the average depth of rainfall over a catchment. 07
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Q.2 (a) Explain the various forms of precipitation. 03
(b) Describe the various factors affecting run-off from a basin area. 04
(c) A rain gauge recorded the following accumulated rainfall during the storm. Draw the mass rainfall curve and the hyetograph. 07
| Time (AM) | 10.00 | 10.15 | 10.30 | 10.45 | 11.00 | 11.15 | 11.30 | 11.45 | 12.00 |
| Accu. Rainfall (mm) | 0.0 | 8.5 | 16.0 | 27 | 37 | 48 | 62 | 80 | 90 |
OR
(c) A storm with a 15.0 cm precipitation produced a direct runoff of 8.7 cm. The time distribution of the storm is as follow. Estimate the w-index and O-index. 07
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| Time from start(hr) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Incremental rainfall (cm) | 0.6 | 1.35 | 2.25 | 3.45 | 2.7 | 2.4 | 1.5 | 0.75 |
Q.3 (a) Give the difference between Specific Yield and Specific Retention for ground water. 03
(b) Describe how to obtain the unit hydrograph from a flood hydrograph resulting from a storm of certain duration. 04
(c) Design a tube well for the following data: 07
Yield required=0.081 cumec; Thickness of confined aquifer=30m; Radius of circle of influence=300m; Permeability coefficient=50m/day; Drawdown=5.1m.
OR
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Q.3 (a) Enlist the different types of aquifers. Explain any one aquifer with neat sketch. 03(b) State the Darcy’s Law. How to measure the co efficient of permeability by use of Darcy’s Law. 04
(c) Determine the ordinates of a 24 hr UH by analytical method. 07
| Time (Hr) | Ordinates of 8hr UH | Time (Hr) | Ordinates of 8hr UH |
| 0 | 0.0 | 40 | 79.0 |
| 4 | 5.5 | 44 | 42.0 |
| 8 | 13.5 | 48 | 31.0 |
| 12 | 26.5 | 52 | 22.0 |
| 16 | 45.0 | 56 | 12.0 |
| 20 | 82.0 | 60 | 8.5 |
| 24 | 162.0 | 64 | 5.5 |
| 28 | 240.0 | 68 | 2.5 |
| 32 | 231.0 | 72 | 1.0 |
| 36 | 165.0 | 76 | 0 |
Q.4 (a) Differentiate between Low head power plants and High head power plants. 03
(b) Write short note on Gravity Dam and Earth Dam. 04
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(c) Explain with a neat sketch the various zones of storage in a reservoir. 07 OR
Q.4 (a) Discuss the various factors affecting for the site selection of a dam. 03
(b) What are the procedures for determining the useful life of reservoir? 04
(c) Explain briefly all components of a hydroelectric power plant with neat sketch. 07
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Q.5 (a) Write the short note on Levees and Flood walls. 03
(b) Enlist the various types of Drought. Explain major causes of drought. 04
(c) Explain theoretical probability distribution Gumbel’s method. 07
OR
Q.5 (a) Describe in brief Flood damage analysis! 03
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(b) What is mean by Water harvesting? Explain any one method of water harvesting. 04(c) Describe the Flood routing with-neat sketch. 07
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