1
Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC- SEMESTER-III EXAMINATION SUMMER 2017
Subject Code: X30601 Date:25/05/2017
Subject Name: Hydrology And Water Resources Engineering
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.
Q.1

Define: Hydrological Cycle. Describe the different components of hydrological cycle with neat sketch.
07

Enlist different types of rain gauges. Explain any two Recording type of rain gauges with neat sketches.
07
Q.2

Explain different types of precipitations in brief.
07

Define the term "Run-off". Explain factors affecting for run-off.
07
OR

What is meant by Evapotranspiration? Enlist different methods of estimation of evaporation and explain any one method in detail.
07
Q.3

Explain Ø-index and W-index with the procedure to determine the same.
07

Determine the optimum number of rain gauges for a basin with the following data:
Number of existing gauges
Allowable permissible error
The average rainfall the existing gauges 110,90,46,75,135,87,65 cm.
07
OR
Q.3

What is S-curve hydrograph? How is it constructed and what is it used for?
07

Explain the procedure of separating base flow in a hydrograph.
07
Q.4

Define the terms: Recurrence interval, Hyetograph, Hydrograph, Wedge storage, Prism storage, Infiltration, Deep Percolation.
07

A 3-hr. storm produced a flood hydrograph as under.
Time(hrs)
0
3
6
9
12
15
18
21
24
27
30
Discharge (cumecs)
4
9
12
18
20
16
20
10
8
6
4
Assuming a constant base flow of 4 cumecs, determine the ordinates of unit hydrograph and draw the UH in graph paper. The catchment area is 50 km2.
07
OR
Q.4

Define: Simulation. Discuss the application of simulation modeling techniques in hydrology and water resources engineering.
07
2

For a river, the estimated flood peaks for two return periods by the use of Gumbel's methods are as follow. Find out flood discharge in this stream for a return period of 500 years.
Return Period (years)
Peak flood
100
450
50
370
07
Q.5

State Darcy's Law. How will you measure the co-efficient of permeability of soil?
07

Explain "Flood Routing'. Explain Modified Pul's method of reservoir routing.
07
OR
Q.5

Explain different types of aquifers in brief with neat sketch.
07

Differentiate between: Flood walls and Flood ways and Flood forecasting and Flood proofing.
07