Flood

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Flood

• Kokoreva Lena
• Abolinsh Anna

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• Flood-is a temporary overflow of water, which
  covers significant areas of the ground.

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Kinds of floods
Frequency Damage of area Strength
Low Once a 10 years 10 Safe
High Once a 20-25 years 15 Quite dangerous
Outstanding Once a 50-100 years 70 Dangerous
catastrophic Once a 100-200 years gt70 Very dangerous
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Causes

• heavy storm
• high tide
• tsunami
• snow and ice thawing

• river floods
• avalanches
• cyclones
• earthquakes

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Defences

• Levees
• Bunds
• Reservoirs
• Weirs
• Sea walls
• Science forecast
• Mechanical barrier

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Flooding in Parnu

• January 2005
• Evacuated 200 people
• No death
• Damaged houses

• flooding in Bern (2005)

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