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

CHAPTER 6
METHODOLOGY FOR FLOOD HAZARD MAPPING
INTRODUCTION
India is the seventh largest country in the world with the Land area of about 3.3
million sq km area and coastline of 7,517 kms. The rapid growth in population and
urbanization compounded by deforestation has enhanced the threat of flood hazard
in last four decays. Every year the floods in some or other areas cause loss of life,
property, crops, and health hazards. The erosion of top fertile soil due to floods is a
major long-term problem reducing the fertility of agriculture land. The frequency
urban floods have significantly increased in recent years due to rapid unplanned
organization with poor drainage system. Almost all the metros like Delhi, Mumbai,
Bangalore, Hyderabad, etc experience urban floods almost every year during
mansoon periods. Some useful information concerning facts are given below:
Total Land Area: 32,87,263 sq km
Length of Coast Line: 7,517 km
Number of Large Dams: 4,525
Length of river (major) Embankment: 16,000 km
Average Flood Affected Area: 90,000 sq km
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