Created on : December 2011 CASE STUDY CASE STUDY 21 Water Proofing Metro Railways, Kolkata During the post-construction period, the Southern part of 'Calcutta Metro Railways' had a serious problem of inflow of water in the box tunnels through different locations which even affected the running of Metro Coach. The sources of water ingress were: Subsoil Water Water flowing from old, dilapidated water mains and sewage of the city vicinity of the outer side of Box tunnels of Metro Railways, alignment from Esplanade to Tollyganj. The leakage points were mainly: a) Construction joints b) Expansion joints c) Joints between the entry structure and main box d) T h e a r e a s u r r o u n d i n g t h e embedded inserts (the end pieces of RSJ used as struts and double 'H' piles used as c

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