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GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-V (Old) EXAMINATION — WINTER 2019
Subject Code: 150602 Date: 06/12/2019
Subject Name: Hydrology & Water Resources Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) Describe a S-Hydrograph. Write the assumptions and its advantages. 07
(b) Explain working of Symons rain gauge with a neatly labelled sketch. 07
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Q.2 (a) Discuss in short: 1) Water Harvesting techniques 2) Meteorological Drought 07
(b) For a storm of 3-hr duration, the rainfall rates are as follows: 07
| Time Period (minutes) | 30 | 30 | 30 | 30 | 30 | 30 |
| Rainfall Rate (cm/hr) | 1.5 | 3.5 | 4.5 | 3.2 | 2.0 | 1.0 |
If the surface runoff is 3.5cm, determine the ¢-index and W-index.
OR
(b) Explain potential evapotranspiration and the methods to measure it. 07
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Q.3 (a) Write a short note on Yield of a reservoir. Discuss the significance of useful life of a reservoir. 07
(b) Write short notes on: 1) Reservoir sedimentation-ii) Spillways 07
OR
Q.3 (a) Discuss the factors affecting the selection of site for a dam. 07
(b) Discuss the classification of Hydro-Electric Power Plant with examples of each. 07
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Q.4 (a) Explain the division of sub-surface water with a neatly labeled sketch. 07
(b) Find the ordinates of a storm hydrograph resulting from a 3 hrs storm with rainfalls 0f 2.7, 6.45 and 3.55 cm during subsequent 3 hours intervals. The ordinates of Unit Hydrograph are given below. Assume an initial loss of 5 mm, infiltration index 2.5mm/hr and base flow of 50 cumecs. 07
| Time (hrs) | 03 | 06 | 09 | 12 | 15 | 18 | 21 | 24 |
| Ordinates of UH (cumecs) | 0 | 112 | 360 | 515 | 385 | 320 | 255 | 230 |
| Time (hrs) | 27 | 30 | 33 | 36 | 39 | 42 | 45 | 48 |
| Ordinates of UH (cumecs) | 175 | 130 | 90 | 65 | 40 | 25 | 15 | 0 |
OR
Q.4 (a) During a recuperation test, the water in an open well was depressed, by pumping by 2.6 metres and it recuperated 1.9 metres in 90 minutes. Find i) yield from a well of 5 m diameter under a depression head of 3 metres ii) the diameter of the well to yield 10 litres/sec under a depression head of 3 metres. 07
(b) Define the following: 1) Aquifuge 2) specific capacity 3) Specific retention 4) porosity 5) Storage Coefficient 6) Drawdown 7) Vadose water 07
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Q.5 (a) Explain channel routing and discuss its application and suitability. 07
(b) Discuss the various methods of flood estimation. Explain any one in detail. 07
OR
Q.5 (a) Discuss structural measures of flood control with suitable sketches. 07
(b) On the basin of isopluvial map, the 50 year 24 hr maximum rainfall at any place is found to be 18 cm, Determine the probability of 24 hr rainfall of magnitude equal to or greater than 18 cm occurring (a) at least once in 10 successive years, (b) two times in 10 successive years and (c) once in 10 successive years. 07
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