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Question
Which type of canal lining is used to prevent soil erosion?
A.
Asbestos lining
B.
Lime surki lining
C.
Boulder lining
D.
Clay lining
Answer ( Option C)

Boulder lining

Solution

Canal Lining: 
The laying of the impervious layer which protects the bed and sides of the canal is called canal lining. 
Canal linings are classified into two types based on the surface of the lining: 
1. Earthen type lining 
2. Hard surface lining 
1. Earth Type Lining: 
They are two types: 
• Compacted Earth lining 
• Soil Cement Lining 
Compacted Earth Lining:
• In this earth material available near the construction sites is used and compacted in order to reduce the size of voids in soil by displacing air and water which in turn leads to an increase in the density, compressive strength, and shear strength of the soil and reduces permeability and seepage losses. 
Soil Cement Lining:
• In this sandy soil and cement is mixed in some definite proportion and mixture used for canal lining. The cement content should be a minimum of 2-8% of the soil by volume. 
2. Hard surface lining: 
This is sub-divided into four types: 
Cement Concrete Lining:
• Concrete linings are suitable for both small and large channels and both high and low flow velocities. 
Brick Lining:
• In case of brick lining, bricks are laid using cement mortar on the sides and bed of the canal. After laying bricks, a smooth finish is provided on the surface using cement mortar. 
Plastic Lining:
• In this, different types of plastic membranes such as Low-density polyethylene, High molecular high-density polythene, Polyvinylchloride are used for canal lining. 
Boulder Lining:
• The different sizes of stone blocks having irregular gradation are laid with mortar for canal lining. It is used to prevent soil erosion.

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