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Flood ppt

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Flood- a natural disaster..which cannot be prevented only controlled.

Published in: Environment
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Flood ppt

  1. 1. PRAGATI SINGHAM
  2. 2.  Introduction  Causes  Effect  Flood prone areas  Flood management  Flood management scope  Conclusion Contents
  3. 3. Introduction  Flood is overflow of excess water that submerges land and inflow of tide onto land.  Most frequent and deadliest Occurs when the geomorphic equilibrium in the river system is disturbed because of-  Intrinsic threshold  Extrinsic threshold Introduction
  4. 4. Natural  Heavy rains  Melting of ice during volcano eruption  Undersea earthquake  Marine landslip Man-made  Bank erosion  Breach of dam/barrage/embankment Causes of flood Meltwater + Volcanic ash & other debris LAHAR
  5. 5. SECONDAR Y PRIMARY TERTIARY Due to direct contact of flood water Due to result of primary effect Due to combined effect of primary & secondary effect Physical damage Disruption of essential services Long term effect Effects of flood
  6. 6. Primary effect Secondary effect Tertiary effect Effects of flood
  7. 7. Flood Prone Areas (M.Ha) in India
  8. 8. Cannot be absolutely controlled only managed Aims of flood management  Protection of people & property  Reduction of flood risk  Monitoring, research, forecasting & warning Flood management
  9. 9. Hard engineering (Structural) Soft engineering (Non-structural)  Embankments  Dams & reservoirs  Channel improvement  Drainage improvement  Diversion of flood rivers  Flood plain zoning  Flood preparedness  Flood forecasting  Afforestation  Public relief Flood management
  10. 10.  Embankments  Dams & reservoirs Flood management (Hard engineering)
  11. 11. Drainage improvement Diversion of flood river Flood management (Hard engineering)
  12. 12. Flood plain Zoning Flood management (Soft Engineering)
  13. 13. Flood management (Soft Engineering)Flood preparedness
  14. 14. Indian forecasting network  Covers major and inter state basins  166 stations Forecasting consists of 4 steps: 1. Data collection 2. Data transmission 3. Data analysis and forecast formulation 4. Dissemination Flood Forecasting Flood management (Soft Engineering)
  15. 15. 3. Data analysis and forecast formulation  Estimation of total rainfall from hurricane Flood Forecasting (contd..) Flood management (Soft Engineering)
  16. 16.  Recurrence Interval: Frequency with which a particular flood height can be expected to return  Established from past records  Recurrence interval = no of peaks in list + 1 ranked position of discharge x Flood Forecasting (contd..) Flood management (Soft Engineering)
  17. 17.  Use of remote sensing GIS (Geographic Information System)  Flood forecast (FF) modelling  Simulation Flood management scope
  18. 18. Although flood is the most deadliest disaster still, but it has some benefits like:  Recharges ground water  Fresh water flood help in maintaining food plain ecosystem  Boost in food production for birds  Facilitation of weather fish to new habitat Conclusion
  19. 19. Water water everywhere but not a drop to drink That is of course until this lovely ship sinks -Jim(1999)

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