Question Paper: Hydrology & Water Resources Engineering : Question Paper May 2016 - Civil Engineering (Semester 5) | Gujarat Technological University (GTU)
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## Hydrology & Water Resources Engineering - May 2016

### Civil Engineering (Semester 5)

TOTAL MARKS:
TOTAL TIME: HOURS

1 (a) Describe non-automatic and automatic rain gauges. Explain the merits and demerits of each.(7 marks) 1 (b) A thunder storm of 6hour duration produces the following flood hydrograph. Derive the ordinates of unit hydrograph for a catchment area of 2845 km2. Also sketch the resulting unit hydrograph.

 Date July 3 July 4 July 5 Time (hour) 6 am 12 noon 6 pm 12 mid night 6 am 12 noon 6 pm 12 mid night 6 am 12 noon Discharge (m3/sec) 100 400 1500 3500 5100 3000 1500 900 400 100
(7 marks) 2 (a) A recording rain gauge was installed on a basin having catchment area of 35 km2. The mass curve of rainfall is recorded during a storm is given below.
If the volume of measured runoff due to storm is 1.4×106 m3, estimate the φ-index of the basin.
 Time from start of storm (hours) 0 2 4 6 8 10 12 14 Accumulated rainfall (mm) 0 8 18 59 68 83 89 95
(7 marks)

### Solve any one question from Q2(b) & Q2(c)

2 (b) Define the following with figure
(1) Earthen dam
(2) Gravity dam
(3) Arch dam
(4) Buttress dam
(5) Spillway
(7 marks)
2 (c) Describe in detail the factors affecting infiltration.(7 marks)

### Solve any two question from Q3(a), Q3(b) & Q3(c), Q3(d)

3 (a) Define unit hydrograph and its uses. Clearly explain the assumption made in the derivation of unit hydrograph.(7 marks) 3 (b) Define the following
(1) Aquifer
(2) Aquiclude
(3) Aquifuge
(4) Specific yield
(5) Specific retention
(6) Storage coefficient
(7) Transmissibility coefficient
(7 marks)
3 (c) Explain Darcy's law with its limitations. Describe the procedure of proving it Experimentally.(7 marks) 3 (d) Describe in brief
(1) Reservoir sedimentation
(2) Reservoir capacity
(7 marks)

### Solve any two question from Q4(a), Q4(b) & Q4(c), Q4(d)

4 (a) Describe the various components of a typical hydropower plant with a neat sketch. Also discuss the function of each component.(7 marks) 4 (b) Describe the situations under which the following dams are constructed
(1) Gravity dam
(2) earthen dam
(3) Arch dam.
Also describe any two major reservoirs of India.
(7 marks)
4 (c) Define flood and its causes. Also discuss various measures taken to control the Flood.(7 marks) 4 (d) (i) Define the following
(a) Return period
(b) Spillway design flood
(c) Probable maximum flood
(3 marks)
4 (d) (ii) bridge has an expected life of 25 years and designed for flood management of return period 100 years.
(a) What is the risk of this hydrologic design
(b) if a 10% risk is acceptable, what return period will have to be adopted.
(4 marks)

### Solve any two question from Q5(a), Q5(b) & Q5(c), Q5(d)

5 (a) Distinguish between
(1) Hydraulic and hydrologic method of flood routing
(2) Hydrologic storage routing and hydrologic channel routing
(3) Prism storage and wedge storage
(7 marks)
5 (b) Describe the types of drought and its causes.(7 marks) 5 (c) Describe various measures of water conservation and augmentation.(7 marks) 5 (d) Describe in brief
(1) Channel improvement
(2) Flood damage analysis
(7 marks)