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Which material is used in canal lining?
PCC
RCC
brick
all of the above
all of the above
Canal lining is an impervious layer provided on the bed and sides of a canal to prevent seepage losses of water, increase discharge capacity, and prevent erosion. Plain Cement Concrete (PCC), Reinforced Cement Concrete (RCC), and brick or tile lining are all widely recognized and standardized materials used in canal lining depending on site conditions, flow velocity, and budget.
Canal lining is an impervious layer provided on the bed and sides of a canal to prevent seepage losses of water, increase discharge capacity, and prevent erosion. Plain Cement Concrete (PCC), Reinforced Cement Concrete (RCC), and brick or tile lining are all widely recognized and standardized materials used in canal lining depending on site conditions, flow velocity, and budget.
Q=n1тАЛAR2/3S1/2 тАФ Manning's formula for canal discharge Q
Seepage┬аLossтИЭPermeability(K)
Lining creates a non-porous barrier between the flowing water and the underlying permeable soil, drastically reducing seepage loss by up to 90-95%. The smoother surface reduces the roughness coefficient (Manning's n), which increases velocity and discharge while preventing weed growth and bank erosion.
PCC lining is the most commonly used lining due to its high durability, impermeability, and structural stability.
RCC lining is used where soil bearing capacity is low, under high embankments, or where structural cracking must be strictly controlled.
Brick or tile lining is preferred in areas with abundant clay, low labor costs, or where flexible lining tolerant to minor settlements is needed.
Prevents up to 90тАУ95% of water seepage losses.
Increases discharge capacity by reducing Manning's roughness coefficient (n).
Prevents scouring, erosion, and weed growth inside the canal bed.
High initial capital cost compared to unlined earthen channels.
Difficult and expensive to repair once damaged or cracked due to frost/settlement.
Requires proper pressure relief valves to prevent damage from uplift hydrostatic pressure.
Main irrigation canals carrying high-velocity discharge.
Distribution canals passing through highly permeable sandy or porous soils.
Manning's roughness coefficient n for unlined earthen canals is around 0.0225тАУ0.030, whereas for concrete lined canals it drops to 0.013тАУ0.015.
Option A (PCC) is widely used for general canal reaches.
Option B (RCC) is used in expansive soils (e.g., black cotton soil) or high fills.
Option C (Brick/Tile lining) is extensively used in state projects like Rajasthan Canal (Indira Gandhi Canal).
D is correct тАФ PCC, RCC, and brick lining are all standard materials utilized in canal lining based on design and hydraulic requirements.
For GATE/ESE exams, remember that lining increases velocity, which reduces the required cross-sectional area for a given discharge, leading to reduced earthwork costs.