Question Paper: Hydrology & Water Resources Engineering : Question Paper Dec 2014 - Civil Engineering (Semester 5) | Gujarat Technological University (GTU)
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## Hydrology & Water Resources Engineering - Dec 2014

### Civil Engineering (Semester 5)

TOTAL MARKS:
TOTAL TIME: HOURS

1 (a) Discuss various causes of drought.(7 marks) 1 (b) Discuss water resources planning and its objectives.(7 marks) 2 (a) Explain the methods of estimating flood.(7 marks) 2 (b) Describe the flood routing with neat sketch.(7 marks)

### Differentiate between following

2 (c) 1 Flood proofing and Flood forecasting(4 marks) 2 (c) 2 Flood walls and Flood ways.(3 marks) 3 (a) Describe the process of the hydrological cycle with a neat sketch(7 marks) 3 (b) In a watershed, the average annual precipitation for four sub-basins was recorded as follows: 100.84,112.27,84.84 & 73.406 cm. the areas of the sub-basins were : 93264.3, 71243.5, 108808.2 & 168393.8 ha., calculate the average precipitation of the total watershed using the Thiessen method.(7 marks) 3 (c) Discuss the various methods used to measure rate of evaporation from a reservoir.(7 marks) 3 (d) The excess rainfall (direct runoff ) produced from a 10.0 cm rainfall of a storm is 6.0 cm. the rainfall at each hour of the storm recorded by a rain gauge is as under. Calculate the infiltration index of the storm.

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 Time (h) 1 2 3 4 5 6 7 8 Incremental rainfall (cm) 0.1 1 1.4 2.6 2 1.5 1 0.4
(7 marks) 4 (a) What is drainage basin? Discuss various characteristics of drainage basin.(7 marks) 4 (b) The ordinates of a 4 h UH of a basin of area 300 km2 measured at 1 h intervals are 6,36,66,91,106,93,79,68,58,49,41,34,27,23,17,13,9,6,3 and 1.5 m3 /s respectively. Obtain the ordinates of a 3 h UH for the basin using the S-curve technique.(7 marks) 4 (c) Discuss types of aquifers with neat sketches.(7 marks) 4 (d) The direct runoff hydrograph resulting from a 5.0 cm effective rainfall of 6 h duration is given below. Determine the area of the catchment and the ordinates of the 6 h Unit Hydrograph.
<colgroup span="14" style="text-align: center;" width="85"> </colgroup>
 Time (h) 0 6 12 18 24 30 36 42 48 54 60 66 72 Direct runoff (m3/s) 0 25 175 320 360 310 230 165 105 60 30 10 0
(7 marks)
5 (a) Describe briefly the various types of reservoirs and also differentiate between single and multi-purpose reservoirs.(7 marks) 5 (b) Discuss various classifications of hydropower plants.(7 marks) 5 (c) Explain the terms : density current, Normal pool level, Dead storage, reservoir yield.(7 marks) 5 (d) Write short notes on : Surge tank, Penstocks(7 marks)