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QUESTION: 1

A gravity dam is to be designed as a high dam if it’s height h is as follows:

where f_{c} = permissible comp, stress, μ, W and S_{s} have their usual meaning

Solution:

QUESTION: 2

In modern practice the free board normally provided for gravity dam is

Solution:

Fine board is provided in gravity dam is normally 3/2 hw or 4-5% of the dam material.

QUESTION: 3

Consider the following statements :

Phreatic line in an earth dam is

1. elliptical in shape

2. an equipotential line

3. the top-most flow line with zero water pressure

4. approximately a parabola

Which of these Statements are correct?

Solution:

QUESTION: 4

The down stream slope of an earthen dam is critical when

Solution:

QUESTION: 5

The safe base width B of an elementary gravity dam profile using stability or sliding criteria is given by

where:

h = height of dam;

C = uplift pressure coefficient.

Others have usual meaning

Solution:

QUESTION: 6

When a reservoir is full, the maximum compressive stress in gravity-dam occurs

Solution:

QUESTION: 7

An earthquake acceleration of 0.1 g acting vertically downward causes in a gravity dam

Solution:

Effective unit weight is given by,

so when α_{v} = 0.1 g (downward)

effective unit weight

Net effective weight of Dam

QUESTION: 8

What is the height of wave which is likely to be generated by a wind of 80 km/hr in a reservoir having a fetch of 50 km?

Solution:

Waves are generated on the surface of reservoir by the blowing winds, which causes a pressure towards the downstream side. Wave pressure depends upon the wave, height. Wave height in metres may be given by the equation.

where V is wind velocity in km/hr and F is fetch in km.

∴

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