High Resolution 1:10,000 scale Mapping Strategy of Multi ... - NDMA

SUMMRY FOR CYCLONE HAZARD ZONATION
CATEGORIZING PRIORITY ZONES (P1, P2, P3) IN HAZARD
ZONING
Background
India is divided into twenty eight states and seven union territories with total
number of 626 districts. India has 7,517 Km of coast line. The eastern coast is
bordered with Bay of Bengal and western coast is surrounded by Arabian Sea. The
cyclogensis is predominately in Bay of Bengal making east coast more vulnerable to
cyclones. The frequency of cyclones is much lesser in Arabian Sea making western
coast less vulnerable. For more details , please refer to Annex- III.
The cyclone and depression data from 1891 to 2007 have been analyzed for
assessment of hazards in the present study. During this period Deep Depressions –
4,610, Cyclones Storms – 553 and Sever Cyclonic Storms – 271 have hit the both
east and west Indian coast line.
High Hazard Zone (mapping priority P1)
The areas, which have been frequently hit by sever cyclonic storms with
intensity T3 and above have been categorized as most vulnerable area and given
high priority (P1) for mapping. These areas are hit by storm surge of three meters
and above, flooding due inundation, high rainfall and wind exceeding 100km/hour.
Mostly the coastal districts of West Bengal, Orissa, Andhra Pradesh and Tamil Nadu
in east coast and Kerala, Maharashtra and Gujarat fall in this category.
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