VTU Civil Engineering (Semester 6)
Hydraulic Structures & Irrigation Design-Drawing
June 2014
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) State and explain different types of storage zones with the help of neat sketch.
7 M
1 (b) The monthly discharge volumes in million m3 for period of 24 months recorded at stream gauging site are: 3, 6, 16, 30, 18, 15, 10, 8, 6, 4, 3, 1, 2, 5, 17, 28, 20, 15, 12, 7, 5, 4, 3 and 2. Determine size of reservoir proposed at the gauging site if it is to maintain an assured supply of 8.33 million m3 per month. The water year may be taken as June-May.
8 M

2 (a) Explain different types of forces acting on a gravity dam.
7 M
2 (b) Briefly explain elementary profile of a gravity dam.
8 M

3 (a) Explain briefly various causes of failure of earth dam.
6 M
3 (b) Draw a neat of earthen dam showing phreatic line with horizontal filter at downstream.
5 M
3 (c) A flow net is to be plotted for homogeneous earthen dam of height 22m and free board 2.0 m. The results obtained are:
Number of potential drops = 10
Number of flow channels = 4
The dam has horizontal filter of 30 m at downstream end and coefficient of permeability of dam material is 5× 10-4 cm/sec. Calculate the discharge per metre run of dam.
4 M

4 Design the surplus work of a tank forming part of a chain of tanks.
Combined catchment area = 25.89 sq.km
Intercepted catchment area = 20.71 sq.km
Maximum water level = +12.75
Full tank level = +12.00
Ground level at purposed site = +11.00
Ground level below weir up to a reach of 6m (Fall) = +10.00
Top width of tank bund = 2m
Tank bund level (TBL) = +14.50
Side slopes of bund on either side = 2:1
Design saturation gradient with 1m clear cover = 4:1
Level of hard strata = 19.50
Ryve's coefficient for combined catchment = 9
Ryve's coefficient for interpreted catchment = 1.5

Provision may be made to make Kutcha regulating arrangements to store water up to MWL in times of necessity.
i) Half plan at foundation and half plan at ground level.
ii) Draw half longitudinal section and half longitudinal elevation.
70 M

5 Design a canal drop of 2 metres with following data:
Hydraulic particulars of canal above drop.
i) Half plan foundation and half plan at ground level
ii) Longitudinal section.
iii) Cross showing half elevation and half section.
70 M

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