Gujarat Technological University
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER–VI(NEW) EXAMINATION – WINTER 2022
Subject Code:3160610 Date:13-12-2022
Subject Name:Water Resources Engineering and Hydrology
Time:02:30 PM TO 05:00 PM Total Marks:70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Simple and non-programmable scientific calculators are allowed.
Q.1 (a) Explain the terms (i) Infiltration capacity (ii) Infiltration rate (iii) 03
Rainfall excess
(b) What is evaporation? Mention the factors affecting evaporation. 04
(c) List various methods of calculating average rainfall over area and 07
evaporation
explain evapoevaration
Isohyetal method.
Q.2 (a) Define (i) Direct runoff hydrograph (ii) Unit hydrograph (iii) S- 03
hydrograph
(b) Explain mass curve? Explain how mass curve is prepared ? 04
(c) A rain gauge recorded the following accumulated rainfall 07
during the storm. Draw the mass rainfall curve and the hyetograph.
Time 10. 10.1 10. 10. 11. 11. 11. 11. 12.
(A.M.) 00 5 30 45 00 15 30 45 00
Accumulate 0.0 8.5 16 27 37 48 62 80 90
d rain fall
(mm)
OR
(c) A peak of flood hydrograph due to 6 hr storm is 470 m3/s. The 07
average depth of rainfall is 8 cms. Assume an infiltration loss of 0.25
cm/hour and a constant base flow of 15 m3/sec. Estimate the peak
discharge of 6-hour unit for this catchment.
Q.3 (a) Explain with a neat sketch, occurance of ground water at various 03
location below the earth surface.
(b) Explain Darcy’s law and what are its limitation? 04
During the recuperation test of a 4.0 m open wee a recuperation of 07
(c) the depression head from 2.5 m to 1.25 m was found to take place in
90 minutes. Determine specific capacity per unit well area. Also
determine yield of well for safe drawdown of 2.5 m.
OR
Q.3 (a) Define (i) porosity (ii) specific retention (iii) specific yield 03
(b) Distinguish between permeability and transmissibility of soil 04
(c) Design an open well in fine sand to give a discharge of 0.03 cumec 07
when worked under a depression head of 2.5 m.
Q.4 (a) Define (i) safe yield (ii) secondary yield (iii) design yield. 03
(b) Explain measure to reduce evaporation losses from reservoir. 04
(c) Explain with neat sketch storage zones of reservoir 07
1
OR
Q.4 (a) Define (i) Trap efficiency (ii) Density currents (iii) capacity- inflow 03
ratio
(b) Discuss in details factors affecting selection of dam type? 04
(c) What are the various causes for the reservoir sedimentation and how 07
would you reduce the rate od sedimentation?
Q.5 (a) Define flood routing. What are the uses of flood routing? 03
(b) Explain roof top water harvesting method 04
(c) Explain various causes of flood 07
OR
Q.5 (a) What is artificial ground water recharge explain any two methods 03
(b) Give the functional requirements of a multi – purpose projects 04
(c) Explain drought and causes of drought 07
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