1.1.16

Flood Risk Factors

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Factors Affecting Flood Risk

When the amount of water in a river is greater than the river's capacity, flooding will happen. Increasing river level is caused by increasing river discharge. There are human and physical factors that can increase discharge, and therefore cause flooding:

Precipitation

Precipitation

  • Heavy rainfall causes high runoff because the water arrives so quickly that there isn't enough time for it to infiltrate the soil.
  • Prolonged rainfall makes the soil become saturated, and so any more rainfall will run off instead of infiltrating.
Geology

Geology

  • Runoff is higher in areas that are mainly made up of impermeable soil (e.g. clay) or impermeable rock (e.g. granite).
Relief

Relief

  • Rainfall will reach the river channel quicker in a steep-sided valley.
Land use

Land use

  • Buildings and roads are usually made of impermeable materials. More impermeable surfaces mean more runoff and more discharge.
  • Trees intercept water and store water that they take up from the ground. Removing trees will, therefore, increase flooding risk as more water will be finding its way into the river channel.
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1

Physical Geography

1.1

River Environments

1.1.1Weathering1.1.2Mass Movement1.1.3Erosion1.1.4Transportation1.1.5Deposition1.1.6River Landforms: Waterfalls & Gorges1.1.7River Landforms: Interlocking Spurs1.1.8River Landforms: Flood Plains1.1.9River Landforms: Point Bars1.1.10River Landforms: Levees1.1.11River Landforms: Meanders1.1.12River Landforms: Oxbow Lakes1.1.13River Landscape Changes: Long Profile1.1.14River Landscape Changes: Cross Profile1.1.15Vertical & Lateral Erosion1.1.16Flood Risk Factors1.1.17Human Activities on Rivers1.1.18River Management: Hard Engineering1.1.19River Management: Soft Engineering1.1.20Case Study: The River Eden - Landforms1.1.21Case Study: The River Eden - Climate1.1.22Case Study: The River Eden - Geology1.1.23Case Study: The River Eden - Management1.1.24Case Study: The River Eden - Human Activity1.1.25End of Topic Test - River Environments
1.2

Coastal Environments

1.2.1Weathering1.2.2Mass Movement1.2.3Erosion1.2.4Deposition1.2.5Longshore Drift1.2.6Sediment Transportation1.2.7Wave Action on Coasts1.2.8Other Factors Influencing Coasts1.2.9Coastal Landforms: Wave-cut Platforms & Cliffs1.2.10Coastal Landforms: Headlands & Bays1.2.11Coastal Landforms: Caves, Arches & Stacks1.2.12Coastal Deposition1.2.13Spits, Bars & Sand Dunes1.2.14Human Activity on Coasts1.2.15Coastal Defences: Hard Engineering1.2.16Coastal Defences: Soft Engineering1.2.17Coastal Defences: Managed Retreat1.2.18Case Study: Holderness Coast Overview1.2.19Case Study: Holderness Coast Management1.2.20Case Study: Holderness Coast Defences1.2.21End of Topic Test - Coastal Environments
1.3

Hazardous Environments - Tropical Cyclones

1.3.1Characteristics of a Tropical Cyclone1.3.2Structure of a Tropical Cyclone1.3.3Physical Hazards of Tropical Cyclones1.3.4The Impacts of Tropical Cyclones1.3.5Responses to Tropical Cyclones1.3.6Vulnerability to Tropical Cyclones1.3.7Preparing for Tropical Cyclones1.3.8Case Study: Katrina1.3.9Case Study: Nargis
1.4

Hazardous Environments - Earthquakes & Volcanoes

1.4.1Earthquakes1.4.2Features of an Earthquake1.4.3Types of Earthquake1.4.4Case Study: L'Aquila1.4.5Case Study: Chile1.4.6Case Study: Japan & Pakistan - Planning1.4.7Volcanoes1.4.8Types of Volcanoes1.4.9Volcanic Eruptions
2

Human Geography

2.1

Economic Activity & Energy

2.1.1Increasing Energy Consumption2.1.2Non-Renewable Energy - Nuclear2.1.3Non-Renewable Energy - Fossil Fuels2.1.4Renewable Energy - Solar2.1.5Renewable Energy - Water & Bio2.1.6Renewable Energy - Hydro2.1.7Energy - Statistical Skills
2.2

Rural Environments

2.2.1Rainforests2.2.2Temperate Forests2.2.3Characteristics of a Temperate Forest2.2.4Goods & Services in Temperate Forests2.2.5Deserts2.2.6Tundra
2.3

Urban Environments

2.3.1Urbanisation in Different Countries2.3.2Causes of Urbanisation2.3.3Consequences of Urbanisation2.3.4Sustainable Urbanisation2.3.5Case Study: Rapid Urbanisation in Mexico City2.3.6End of Topic Test - Urbanisation
3

Global Issues

3.1

Fragile Environments & Climate Change

3.1.1Natural Causes of Climate Change3.1.2Effects of Climate Change on the Environment3.1.3Effects of Climate Change on People3.1.4Impacts of Deforestation3.1.5End of Topic Test - Climate Change3.1.6Increasing Water Supply3.1.7Sustainable Rainforest Management
3.2

Globalisation & Migration

3.2.1Globalisation - Transport3.2.2Globalisation - Communication Networks & Banking3.2.3Push & Pull Factors3.2.4TNCs & Globalisation3.2.5Tourism Landscapes3.2.6The Growth of Tourism3.2.7The Economic Benefits of Tourism3.2.8The Social & Cultural Benefits of Tourism3.2.9The Economic Costs of Tourism3.2.10The Social & Cultural Costs of Tourism3.2.11Managing Tourism - Sustainability3.2.12Managing Tourism - Quotas & Tourism Hubs
3.3

Development & Human Welfare

3.3.1Ways of Defining Development3.3.2Different Ways of Measuring Development3.3.3Environmental Factors Causing Uneven Development3.3.4Historical Factors Causing Uneven Development3.3.5Economic Factors Causing Uneven Development3.3.6Patterns of Development3.3.7How Can we Reduce the Global Development Gap?3.3.8Top-Down & Bottom-Up Development

Practice questions on Flood Risk Factors

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    Runoff is high in areas dominated by impermeable surfaces. Which of the following have impermeable surfaces?True / false
  2. 2
    Which of the following would increase the risk of flooding?True / false
  3. 3
    Flooding is a major social, economic and environmental problem. Hydrographs show many features that can be used to analyse a flood. Which one of the following is a feature of a hydrograph?Multiple choice
  4. 4
    Elena was asked to group different river management strategies into two categories to minimise and/or prevent river flooding. The two categories were either hard engineering or soft engineering. Which one of the following are all hard engineering strategies?Multiple choice
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Vertical & Lateral Erosion

Human Activities on Rivers