APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY D
(Civil Department)
(Water Resources and Hydroinformatics)
FIRST SEMESTER M.TECH. DEGREE EXAMINATION DEC 2017
07-CE-6407
SURFACE WATER HYDROLOGY
Time:3 hours
Max. marks: 60
Answer all six questions. Part of each question is compulsory.
Answer either part or part of each question
(Students are permitted to bring Graph sheets and Certified data tables.)
Module 1
1a
Discuss briefly the various stream patterns.
4
Answer b or c
1b
What is DAD curve? Write the procedure for the construction of DAD curve for a basin
5
1c
Explain a procedure for supplementing the missing rainfall data.
5
Module 2
2a
Briefly describe the factors affecting evapotranspiration process.
4
Answer b or c
2b
An isolated 3-hr storm occurred over a basin in the following fashion.
of catchment area
index(cm/hr)
Rainfall
1st hour
2nd hour
3rd hour
20
1.00
0.8
2.3
1.5
30
0.75
0.7
2.1
1.0
50
0.50
1.0
2.5
0.8
5
2c
Estimate the runoff from the catchment due to the storm
Explain the double ring infiltrometer test to determine the infiltration rate and explain how the Horton's constants can be computed using these observed data.
5
Module 3
3a
Define Unit Hydrograph. What are the assumptions underlying the Unit Hydrograph theory. How do they limit the applicability of unit hydrograph?
4
Answer b or c
3b
Describe two methods of deriving Unit Hydrographs from complex storms.
5
3c
The ordinates of a 6 hr Unit Hydrograph are given
5
Time
0
3
6
9
12
18
24
30
36
42
48
54
60
66
Ordinate of 6h UH
0
150
250
450
600
800
700
600
450
320
200
100
50
0
A storm had three successive 6-h intervals of rainfall magnitude of 3.0,5.0,and 4.0cm,respectively.Assuming a index of 0.20cm/h and a base flow of 30m3/sec, determine and plot the resulting hydrograph of flow.
Module 4
4a
What is an IUH? What are its characteristics?
4
Answer b or c
4b
Characteristics of two catchments M and N measured from a map are given below.
For catchment Lca=76km =148km,and A=2718km2.For catchment Lca=52km,
L =106km,and A=1400 km2.For the 6h Unit Hydrograph in catchment M the peak discharge obtained is at 200 m3/s and occurs at 37 h from the start of the rainfall excess. Assuming the catchments M and N are meteorologically similar, determine the elements of the 6h synthetic Unit Hydrograph for the catchment N by using Snyder's method
5
4c
What is flood? Describe any four methods of estimation of flood
5
Module 5
5a
Explain the stream flow measurement using area velocity method
5
Answer b or c
5b
Route the following flood hydrograph through a river reach for which Muskingum coefficient k=8h and x=0.25
Time
0
4
8
12
16
20
22
24
28
Inflow m3/s
8
16
30
30
25
20
40
15
10
7
5c
What is meant by flood routing? What are the uses of flood routing? Differentiate Reservoir routing and channel routing
7
Module 6
6a
Differentiate between Flow mass curve and Flow duration curve.
5
Answer b or c
6b
The following gives the observed annual flood values in a river. Estimate the flood peaks with return periods of 50years using Gumbel's extreme value distribution and 100 years by using Log- Pearson Type III distribution
Year
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
Flood
3210
4000
1250
3300
2480
1780
1860
4130
3110
2320
2480
3405
7
6c
Write a note on Time series Return period Curve.
7