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Load the mind with new topic of tunnel engineering which is  Drainage of Tunnel                         BASICS ABOUT DRAINAGE IN TUNNEL In a tunnel water comes from shafts and portal which is being dug in order to achieve the alignment of tunnel, water which is being used during washing  holes of drill and progressing the tunnel during the time of construction,The water obtained from the first source cannot be easily determined and water obtained from the second cause requires analysis and investigation and can be prevented by RCC bulkhead. Exploding charge may open up a ground water source unexpectedly omitting large quantity of water into the tunnel. Such sudden shot of water give rise to conditions  An underground pocket or lake has been trapped. An underground flow with an inexhaustible source such as river or  lake has been trapped The progress of tunneling work and the maintenance of tunnel drainage after its construction primarily depends on good drainage of tunnel.If the drai