Download GTU BE/B.Tech 2019 Winter 5th Sem New 2150602 Hydrology And Water Resources Engineering Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V (New) EXAMINATION - WINTER 2019

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Subject Code: 2150602 Date: 02/12/2019
Subject Name: Hydrology & Water Resources Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Define: Drought, Evapotranspiration, Ground water. 03
(b) Enlist types of dams based on their function. Explain any one in brief. 04

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(c) What is hydrological cycle? Give a brief discussion of different 07
components of hydrological cycle with neat sketch.

Q.2 (a) Enlist the types of Precipitation. Explain any one with neat sketch in brief. 03
(b) Write short note on Leeves and flood walls. 04
(c) The recording rain gauge was installed on a basin having catchment area 07

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of 40 km². The mass curve of rainfall is recorded during a storm is given
below. If the volume of measured runoff due to storm is 1.35x10⁶m³,
estimate w-index and F-index of the basin. Consider start of storm in
hours and cumulative rainfall in mm.

Time from start of storm [0 2 4 6 8 10 12 14 16

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Cumulative rainfall 0 7 19 58 70 85 93 99 102

OR

(c) Find out the ordinates of a storm hydrograph resulting from a 9 hr storm 07
with rainfall of 2.0, 5.75 and 2.75 cm during subsequent 3-hr intervals.
The ordinates of 3 hr UH at 3 hr interval are 0, 100, 355, 510, 380, 300,

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260, 225, 165, 120, 85, 55, 30, 22, 10, 0 cumecs. Assume an initial loss of
0.5 cm, an infiltration index of 0.25cm/hr and a base flow of 10 cumecs.

Q.3 (a) Explain the terms with suitable example: Aquifuge, Aquiclude, Aquitard. 03
(b) A fully penetrating well of diameter 0.5m is drilled in a confined aquifer 04
2.5m thick. If a steady state draw downs at 12m and 50m are observed to

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be 2.50m and 0.6m. Determine the discharge. Take k=1x10^-4m/s.
(c) Discuss the various methods of determining the average depth of rainfall 07
over a catchment.

OR

Q.3 (a) What is spillway? Explain function of spillway. 03

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(b) What are the different methods of improving duty of water? 04
(c) Give difference between: (I) Hyetograph and Direct runoff hydrograph, 07
(II) Unit hydrograph and S-Hydrograph.

Q.4 (a) Explain factors affecting the selection of site for a dam. 03
(b) Give difference between Penstocks and Turbines. 04

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(c) Discuss with neat sketch, the various zones of reservoir. 07

OR

Q.4 (a) Explain Ogee spillway and Chute spillway. 03
(b) Define: (I) Safe yield, (II) Density current, (III) Trap efficiency, (IV) 04
Useful life of a reservoir.

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(c) Write principle components of hydro electrical scheme and explain them 07
with their utility.

Q.5 (a) Give difference between hydrological drought and meteorological 03
drought.
(b) Write short note on flood forecasting and warning. 04

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(c) A bridge has an expected life of 25 years and designed for flood 07
management of return period of 100 years. (a) What is the risk of this
hydrologic design? (b) If a 12% risk is acceptable, what return period will
have to be adopted?

OR

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Q.5 (a) Explain various causes of flood. 03
(b) Explain: (I) Hydrologic Storage routing, (II) Hydrologic channel routing. 04
(c) What is Water harvesting? Explain various methods water harvesting. 07