Tunnel Engineering

Which one of the following methods is adopted for permanent drainage of tunnels?

  • A. Provision of longitudinal drains
  • B. Continuous open drains
  • C. Concrete lining
  • D. All the above
Answer: Option D.
Explanation: 

IS 14665 gives details about elevators. It specifies the number, capacityof elevator and number of floors to be served.

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