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VTU Civil Engineering (Semester 6)
Hydraulic Structures & Irrigation Design-Drawing
May 2016
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

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a. Cross section showing half elevation and half section.
15 M
b. Longitudinal section.
15 M
c. Half plan foundation and half pan at ground level.
20 M

1(a) Explain the graphical methods for the determination of the required storage capacity of a reservoir when the demand is i) Uniform ii) Non-uniform.
7 M
1(b) Write short notes on any two of the following :
i) Flood control reservior ii) Distribution reservoir iii) Multipurpose reservoir.
4 M
1(c) The Construction costs for certain possible heights of a dam at a given site have been estimated and the storage capacity for all these dam heights are tabulated in the table below:
SI. No

Height of the dam 

in meter

Construction cost

In mmillion rupees

Storage in million

cubic meters
1 10 04 50
2 20 08 100
3 30 12 180
4 40 18 250
5 50 27 350
6 60 39 500
7 64 50 600

Determine the most economical height of the dam.
4 M

2(a) Define Gravity dam. Explain with neat sketch the drainage galleries in gravity dam.
6 M
2(b) Following data were obtained from the stability analysis of a concrete gravity dam:
i) Total overturning moment about toe = 1.1 × 106 kN-m.
ii) Total resisting moment about toe = 2.1 × 106kN-m.
iii) Total vertical force about base = 54,000kN.
iv) Base width of the dam = 50m.
v) Slope of the D/S face = 0.8H : 1V.
Calculate the maximum and minimum vertical stress to which the foundation will be subjected to, what is the maximum principal stress at toe? Assume there is no tail water.
9 M

3(a) Explain the two different methods which are adopted for constructing earthen dams. Which of these methods would you perfer any why?
6 M
3(b) What precautions and remedial measures would you undertake to control the seepage through, i) Earthen dam body ii) The dam foundation.
9 M

4 Design a surplus weir for the following data : Combined catchment area = 51 km2 ;
Intercepted catchment area = 46km2 ; Top bund level (TBL) = 100.00m ;
Maximum water level (MWL) = 98.50 m, ; Full tank level (FTL) = 97.5m;
Average ground level at proposed site = 96.5m ; Top width of tank bund = 2m ;
Side slopes of bund on either side = 2:1 ; Level of hard strata for foundation = 95,00m ;
The ground level below the weir (D/S of weir) slopes to a level of 95.50m in a distance of about 6m.
Ryve's co-efficient C = 8 ; Modified Ryve's coefficient C = 2.5.
Provisions may be made to make Kutcha regulating arrangements to store water upto MWL in terms of necessity.
Draw to a suitable scale the following views of the above designed surplus weir.
a. Cross section of weir.
b. Draw half longitudinal section and half longitudinal elevation.
Draw half plan at foundation and half plan at ground level.
70 M

Draw :
5

Design a canal regulator - cum road bridge with the following particulars :
Hydraulic particulars of canal upstream : Full supply discharge = 20m3 Bed width = 15m ; Bed level = 20.0m ; Full supply depth = 2.0m.;
Full supply level = + 22.0m ; Top level of bank = + 23.0m.
The right bank is 5m wide and left bank is 2m wide.
Hydraulic particulars of canal downstream : Full supply discharge = 16m3/sec ;
Bed width = 15 m ; Bed level = +20.0m ; Full supply depth = 1.75m ;
Full supply level =+ 21.75m ; Top level of bank = +22.75m.
Top width of banks are the same as those on the upstream side. The regulator carries a road way single lane designed for I.R.C loading class 'A'. Provide clear freeboard of one meter above F.S.L. for road bridge. Good foundation soil is available at + 19.00. Assume the ground level site as + 22.00. The co-efficient of drawing ratio for 80% is 1.645, 85% is 1.58 and 90% is 1.358.
25 M


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