On 15 April 2012 at around 13:00 local time, following a heavy rainfall in Tehran, a break in the channel wall of Kan River caused a flash flood in the Tehran metro tunnels. Consequently, line 4 of the metro went out of operation for about two weeks. The flood was running for 30 hours in the metro system so that three stations were flooded causing damage to four trains and 28 wagons. It is estimated that approximately one million cubic meters of water and debris rushed in the metro tunnels through the break. Although this flash flood caused property damage of about $21 million (at the then official exchange rate) to the metro especially its electrical system, fortunately no death and injury ensued. Quick measures were taken to disconnect electricity and evacuate more than 1,500 passengers and staff from the adjacent stations while simultaneously the water was draining. For a few days, more than 10 thousands m3 of debris and precipitants were removed from the stations and trains. Finally, damaged stations were repaired and got back to the operation in 12 days. It was claimed that 2,500 persons worked every day during the response to this disaster. Immediate disconnection of the electricity system prevented electrocutions. Timely emergency evacuation in this event saved hundreds of lives. All trains were stopped in adjacent stations and the passengers were instructed by the staff to safely evacuate the metro. In addition, dwellers near at risk stations were relocated to safe buildings. Here, we wish to address some challenges along with corresponding lessons learned that have a bearing on revisions to the emergency plan of Tehran in general and Tehran's metro in particular.
Language: en
LA - en SN - 2157-3999 UR - http://dx.doi.org/10.1371/currents.dis.b80efb4a82b7bc2b9dbb5280d79da497 ID - ref1 ER -