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Q: For cast in situ lining, identify the false statement.
  • A. It has a higher initial cost.
  • B. It is most resistant to erosion.
  • C. The recurring maintenance charges are high.
  • D. It has a longer life than that of any other type.
Correct Answer: Option C - Precast concrete lining (Cast in situ lining)–It has highest durability hydraulic efficiency and imperviousness. The precast slabs and tiles are more compact and dense than in situ lining. Thickness of lining is also less and is economical to construct both from stand point of material. Precast lining is suitable in the following cases– • Where seepage losses are no consideration. • Speedy lining in a short time • Where water-table is high as water pressure is released through the joints between the slabs.
C. Precast concrete lining (Cast in situ lining)–It has highest durability hydraulic efficiency and imperviousness. The precast slabs and tiles are more compact and dense than in situ lining. Thickness of lining is also less and is economical to construct both from stand point of material. Precast lining is suitable in the following cases– • Where seepage losses are no consideration. • Speedy lining in a short time • Where water-table is high as water pressure is released through the joints between the slabs.

Explanations:

Precast concrete lining (Cast in situ lining)–It has highest durability hydraulic efficiency and imperviousness. The precast slabs and tiles are more compact and dense than in situ lining. Thickness of lining is also less and is economical to construct both from stand point of material. Precast lining is suitable in the following cases– • Where seepage losses are no consideration. • Speedy lining in a short time • Where water-table is high as water pressure is released through the joints between the slabs.