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VTU Civil Engineering (Semester 6)
Hydraulic Structures & Irrigation Design-Drawing
June 2015
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

1 (a) Explain the different storage zones of reservoir with the help of diagrams.
5 M
1 (b) Briefly explain the procedure for determine the storage capacity and yield of a reservoir using mass curve.
10 M

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

3 (a) Explain the design criteria for earthen dam.
7 M
3 (b) Explain the causes for failure of earthen dam.
8 M

4 Design a surplus weir with stepped apron of a tank forming part of a chain of tanks with the following details.
 Combined catchment area = 24.5 km2 Intercepted catchment area = 20.4 km2 Maximum water level = +123.75 Full tank level = +123.00 Ground level @ proposed side = +122.00 Ground level below proposed weir upto a reach of 5m (Fall) = +121.00 Tank bund level (TBL) = +125.50 Tank bund of tank bund = 2.0m Side slope of bund on either side = 2.1 Level of hard strata = +120.50 Ryve's coefficient for combined catchment = 9 Ryve's coefficient for intercepted catchment = 1.6 Take hydraulic gradient = 1.5

Draw to a suitable scale.
a) Half plant at top and half plan at foundation.
b) Half elevation and half sectional elevation.
c) Cross section across the weir.
70 M

5 Design a canal drop of 2m with following data:
 Particular U/S canal D/S canal Full supply discharge 4 cumecs 4 cumecs Bed width 6m 6m Bed level +21.00 +19.00 Full supply depth 1.5m 1.5m Full Simply Level (FSL) +22.50 +20.50 Top width of bank 2m 2m Top Bank Level (TBL) +23.50 +21.50

[ egin {align*} Side slopes =& 1:1 (cutting) \ & 1 dfrac {1}{2}:1 (filling) end{align*} ] Half supply depth = 1m
Ground level at site = 1m
Good soil available for foundation = +19.50.
Draw
a) Half plan at foundation and half plan at top.
b) Longitudinal section
c) Cross section showing half elevation and half section.
70 M

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