Hydrology & Water Resources Engineering : Question Paper May 2014 - Civil Engineering (Semester 5)

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Hydrology & Water Resources Engineering - May 2014

Civil Engineering (Semester 5)

TOTAL MARKS:
TOTAL TIME: HOURS

1 (a) Explain the various methods of determining average rainfall over a catchment due to storm. Discuss relative merits and demerits of each.(7 marks) 1 (b) Define unit hydrograph. Describe the procedure of deriving a unit hydrograph from a given flood hydrograph.(7 marks) 2 (a) 1 Explain the following terms:
1. Precipitation.
2.Infiltration capacity.
3.Evapo-transpiration.
4.Infiltration Rate.
5.Hydrograph.
6.Floods
7.Drought.(7 marks) 2 (b) Describe in detail the factors affecting infiltration.(7 marks) 2 (c) A storm with 11cm precipitation produces a direct surface runoff of 6.2 cm. The time distribution of the storm is given in the following table.

Time from start in hour	1	2	3	4	5	6	7	8
Incremental rainfall in each hour in cm	0.5	1.0	1.8	2.6	2.0	1.5	1.2	0.4

Compute the Φ index of the storm.(7 marks) 3 (a) Define runoff, sub-surface runoff and direct runoff. Explain the factors affecting runoff.(7 marks) 3 (b) The ordinates of flood hydrograph from a 4 hour rainfall are given below. Derive the ordinates of 4 hour unit hydrograph for a catchment area of 640 km<sup.2< sup=""> .
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Time (hours)	0	4	8	12	16	20	24	28	32	36	40
Discharge m3/s	30	68	205	410	330	254	195	133	95	58	30

</sup.2<></span>(7 marks)

Define the following in relation to aquifer

3 (c) 1 Confined aquifer(1 marks) 3 (c) 2 Unconfined aquifer.(1 marks) 3 (c) 3 Aquiclude(1 marks) 3 (c) 4 Aquifuge(1 marks) 3 (c) 5 Transmissibility(1 marks) 3 (c) 6 Storage coefficient(1 marks) 3 (c) 7 Specific yield(1 marks) 3 (d) A 30 cm diameter well completely penetrates a confined aquifer of permeability 45 m/day. The length of strainers is 20 m. Under steady state of pumping, the drawdown at the well was found to be 3.0 m and radius of influence was 300 m. Calculate the discharge.(7 marks)

Write a short note on

4 (a) 1 Rational formula for flood estimation(4 marks) 4 (a) 2 Flood forecasting and warning(3 marks) 4 (b) Explain various causes of flood and their preventive measures.(7 marks) 4 (c) Explain the procedure to determine the reservoir capacity using mass curve.(7 marks)

Describe in brief

4 (d) 1 Reservoir sedimentation(4 marks) 4 (d) 2 Components of power house(3 marks)

Write a short note on

5 (a) 1 Causes of drought(4 marks) 5 (a) 2 Water conservation(3 marks) 5 (b) Explain various methods of water harvesting.(7 marks) 5 (c) Explain flood frequency analysis.(7 marks) 5 (d) Explain functional requirements of water resources projects.(7 marks)

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