Floods

• Not all floods are made by humans
• Drowning accounts for 75% of deaths change
• Flood disasters are more Frequent
• Ability to warn, evacuate and protect communities from floods are weak
• Areas that gets Floods alt
• Floods are most Frequent natural disaster
• Overflow four frequent submerges land tab is usually dry
• Causes of floods


  1. Heavy rain

  2. Rapid snowmelt

  3. Storm surge

  4. Tropical cycle

  5. Tsunami
• Floods bring water, fresh-
• Floods cause wide spread devastation, loss in life, personal property and public health infrastructure
• 1993-2021 flood affected 2 billion people
• People that live on floodplains lack warning systems to aware of Flooding hazards
• Floods drown, bodly injure and hurts, damage buildings & properties
• Types of floods


  • Flash flood
  • River Flood
  • Coastal floods
• Flash flood


  Rapid exessive rainfall that raises water heights and floods rivers streams
• River Flood


  Consistent rain or snow melt forces
• Coastal floods


  Storm surges, tropical cycone and tsunomis
• Rivers are the most common source of flooding, with urban areas being particularly vulnerable due to their high population density and infrastructure.
• Causes of Floods


  1. Long period of heavy rain

  2. Steep slope which rainwater flow quickly

  3. Flat land where river can spread

  4. Lack of vegetation, trap water flows quickly

  5. Tsunamis and storms
• Causes of floods by people

  • Town and cities building, roads covering
  • Large land areas water flows off these
  • Into river quickly causing overflow
• Farmers, builders may remove natural

  Rivers, water traps, wetlands, lake without cover traps water flows quickly off land
• Remove or burn natural vegetation


  Water flows quickly where there is no land
• Rivers inside


  Concrete channels or pipes make water flow faster
• Steps to manage wetland drainage systems

  1. Make laws that prevent people from living in high flood risk areas

  2. Improve drains that take away water in settlements

  3. Build protective walls along the banks of rivers

  4. Improve the design of houses so that they are not affected as badly by flooding

  5. Educate people about flood dangers

  6. Build settlements away from river banks

  7. Build small dam walls across the river to stop the river flowing too fast

  8. Keep natural vegetation and wetland areas to slow down the flow of water off the land

  9. Make steps on the land called terraces to keep water on the land for longer before it flows into rivers
• Wetland


  Natural drainage system
• Wetlands have little
• In coastal regions, sea level rise is causing more frequent and severe storm surges, leading to increased risks of coastal flooding.