Page 9 - Risk Management Bulletin April -June 2021
P. 9

RMAI BULLETIN APRIL TO JUNE 2021


             experience storm surge waves with a height of 10 to  Y  Well engineered structures with roofing systems
             13 meters above the normal sea tide level. The height  made of metal/ACC sheets/tiles/gable ends may
             of the storm surge may increase by the height of    suffer partial damages.
             normal sea tide at the time of cyclone hitting the land  Y  Well engineered RCC structures with RCC roof may
             above the sea water storm surge of 10 to 13 meters.  withstand the forces of wind.
                                                              Y  Non-symmetrical/fancy architectural structures
             History of weather disturbances that
                                                                 may suffer heavy damages.
             hit the location                                 Y  Top heavy structures such as  water tanks

             The weather disturbances recorded by the Indian     supported on single column, chimneys may
             Meteorological Department (IMD) that hit West Bengal  collapse.
             zone since the year 1891 to 2019 are as follows :
                                                              Note - However in all the above structures, rolling
               Weather Disturbance              Number of     shutters/doors/windows/glass parts/external walls of
                                                  Events      glass in modern commercial buildings would get
               Depressions / Deep Depressions      110        heavily damaged by wind forces/gale winds/flying
               Cyclonic Storms                      22        debris and also facilities installed in the open or on roof
                                                              such as solar heating/power systems/Towers etc. may
               Severe Cyclonic Storms               20
                                                              get totally damaged and may have to be replaced by
               Very Severe Cyclonic Storms           4
                                                              new ones after the cyclone.
               Extreme Severe Cyclonic Storms        0
               Super Cyclonic Storms                 0        Building under Construction/Plants under
                                                              Erection:
             Probability and intensity of cyclone
                                                              Y  Building under construction/Plants under erection
             hitting the location                                are yet not completed and hence do not have the
             In the next 10 years the cyclones of following      full strength and therefore may suffer heavy
             intensities may hit the above West Bengal location :  damages.
               Cyclone Intensity  Sign  Wind Speed   No. of   Y  Cranes which may collapse and other equipments
               (IMD)                      (km/hr)   Cyclones     on site may suffer heavy damages.
               Severe Cyclonic Storm  SCS  88 to 117  1
               (SCS)                                          Disruption of services:
                                                              There will be disruption of electrical,
               Very Severe Cyclonic  VSCS  118 to 166  1
                                                              telecommunication, rail, road, water services due to
               Storm (VSCS)
                                                              heavy damages by wind forces. There may not be any
               Extremely Severe   ESCS   167 to 221   0
                                                              local support available for repairs/reconstruction
               Cyclonic Storm (ESCS)
                                                              services in this difficult times. It may take a month or
               Super Severe Cyclonic  SuCS  222 & Above  0    so to come back to normalcy, if not more.
               Storm (SuCS)
             Note: Super and Extremely Severe Cyclonic Storms are Flood Damages:
             rare events and cannot be predicted accurately.  Property/contents at the ground floor level and
                                                              basements would suffer substantial damages. The
             Vulnerability                                    extent of damage would depend on velocity, depth &
             Wind and Flood Damages                           duration of the flood water at the site. Also the
                                                              susceptibility of the contents to water damage would
             Structures that are completed and occupied :
                                                              be critical.
             Y   All non-engineered structures with roofing
                 systems made of metal/ACC sheets/tiles/gable  Agriculture:
                 ends would be total loss.                    Y  There are a large number coconut, betel nut etc.
             Y   RCC structures with RCC roof may suffer damages  plantations and other fruit bearing trees e.g.
                 but may not collapse.                           mangoes etc. on the Indian coast and would suffer

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