EOS 170: Natural Hazards - Flooding (Final Exam)
Flooding
The overflow/accumulation of water that submerges (normally dry) land. Affects
many widespread regions across Canada.
More, 1/3rd
Globally, flooding affects ___ (more/less) people than any other natural disaster. As
much as __ of the world's surface area can be effected by flooding.
3
Of the ten deadliest disasters of the last century, flooding accounts for ___ of them,
and holds the #1 spot with 1-4 million fatalities.
Damage to buildings, drowning, contamination of water, water-borne diseases, and
damage to agriculture (famine)
Impacts of Flooding
Rainfall and Infiltration
What are the Two Causes of Flooding?
,Overflow from oceans, lakes, and rivers. Or accumulation of rainwater/meltwater
Water Sources for Flooding
Storm surges, meteotsunamis, tectonic tsunamis, landslides, volcanoes, or impact
events
Causes of Coastal Flooding
Hydrometeorological Floods, Natural Dams
Inland Flood Types
Hydrometeorological Floods
Flooding due to specific weather conditions (rainfall, snowmelt, rain-on-snow,
icejam.
Natural Dams
Formation (by landslide) causes obstruction of flow, leading to flooding or dam
failure, causing an outburst flood.
Rainfall Rate
How fast rain falls.
, Infiltration Rate
How fast water soaks into the ground.
Rainfall = Infiltration Rate
Condition with no surface runoff (no flooding risk)
Rainfall = Infiltration Rate (image)
Rainfall > Infiltration Rate
Condition with surface runoff (flooding risk)
Rainfall > Infiltration Rate (image)
Drainage Basins
Area of land where rainfall is ultimately collected after it travels from mountain
peaks down drainage divides. Flooding occurs in caring capacity is exceeded.
Flooding
The overflow/accumulation of water that submerges (normally dry) land. Affects
many widespread regions across Canada.
More, 1/3rd
Globally, flooding affects ___ (more/less) people than any other natural disaster. As
much as __ of the world's surface area can be effected by flooding.
3
Of the ten deadliest disasters of the last century, flooding accounts for ___ of them,
and holds the #1 spot with 1-4 million fatalities.
Damage to buildings, drowning, contamination of water, water-borne diseases, and
damage to agriculture (famine)
Impacts of Flooding
Rainfall and Infiltration
What are the Two Causes of Flooding?
,Overflow from oceans, lakes, and rivers. Or accumulation of rainwater/meltwater
Water Sources for Flooding
Storm surges, meteotsunamis, tectonic tsunamis, landslides, volcanoes, or impact
events
Causes of Coastal Flooding
Hydrometeorological Floods, Natural Dams
Inland Flood Types
Hydrometeorological Floods
Flooding due to specific weather conditions (rainfall, snowmelt, rain-on-snow,
icejam.
Natural Dams
Formation (by landslide) causes obstruction of flow, leading to flooding or dam
failure, causing an outburst flood.
Rainfall Rate
How fast rain falls.
, Infiltration Rate
How fast water soaks into the ground.
Rainfall = Infiltration Rate
Condition with no surface runoff (no flooding risk)
Rainfall = Infiltration Rate (image)
Rainfall > Infiltration Rate
Condition with surface runoff (flooding risk)
Rainfall > Infiltration Rate (image)
Drainage Basins
Area of land where rainfall is ultimately collected after it travels from mountain
peaks down drainage divides. Flooding occurs in caring capacity is exceeded.
