ABSTRACT
The requirements of tunnels to be provided differ with the purpose for which the tunnel is being provided. The Traffic tunnels are provided for the purpose of transportation of goods and people and their requirements can be broadly classified as operational, structural, Constructional and maintenance. The conveyance tunnels are provided for conveying materials, water or sewage. The ones for conveying materials are generally limited to industries or the smaller areas and their requirements pertain mainly to the structural, constructional and maintenance aspects. Ones used for conveyance of water, sewage etc., have in addition to be taken care of in respect of surface finish, water tightness, velocity of flow through them etc., in addition to structural, construction and maintenance concerns.
