3.3.18

Flood Defences - Hard Engineering

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Flood Defences - Hard Engineering

Hard engineering strategies aim to reduce the effects of flooding by building man-made constructions that control a river's flow. Examples of hard engineering strategies include:

Dams and reservoirs

Dams and reservoirs

  • A dam is a large earth, stone or concrete wall built across a river in the upper course. Behind the dam, a reservoir (man-made lake) forms.
    • Reservoirs can reduce flooding risk by filling up with water when there is a lot of rainfall. This water can either be drunk or used to produce energy (hydroelectric power).
    • But, dams are expensive and habitats and towns can be destroyed by the flooding needed to create a reservoir.
  • The soil downstream from a reservoir usually loses some of its fertility because minerals are deposited in the reservoir instead of downstream.
Channel straightening

Channel straightening

  • Bends and meanders are removed by constructing man-made, straight channels connecting the meanders.
    • Straight channels reduce flood risk by keeping the water flowing through an area quickly.
    • But, downstream areas are more at risk of flooding and erosion because more water flows there more quickly.
Embankments

Embankments

  • Embankments are walls built either side of the river channel to raise the height of the banks.
    • Embankments reduce flooding risk by increasing the capacity of the river.
    • But, embankments are expensive to build and if the banks do burst, then flooding can still happen.
Flood relief channels

Flood relief channels

  • Flood relief channels are secondary channels built alongside rivers that divert water away from particular areas or take it somewhere else if there is too much rainfall.
    • The amount of water flowing through a given point in a river is reduced (river discharge falls).
    • But, the river discharge will increase at the junction between the relief channel and the river it links up with.
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1

The Challenge of Natural Hazards

1.1

Natural Hazards

1.1.1Natural Hazards1.1.2Types of Natural Hazards1.1.3Factors Affecting Risk1.1.4People Affecting Risk1.1.5Ability to Cope With Natural Hazards1.1.6How Serious Are Natural Hazards?1.1.7End of Topic Test - Natural Hazards1.1.8Exam-Style Questions - Natural Hazards
1.2

Tectonic Hazards

1.2.1The Earth's Layers1.2.2Tectonic Plates1.2.3The Earth's Tectonic Plates1.2.4Convection Currents1.2.5Plate Margins1.2.6Volcanoes1.2.7Volcano Eruptions1.2.8Effects of Volcanoes1.2.9Primary Effects of Volcanoes1.2.10Secondary Effects of Volcanoes1.2.11Responses to Volcanic Eruptions1.2.12Immediate Responses to Volcanoes1.2.13Long-Term Responses to Volcanoes1.2.14Earthquakes1.2.15Earthquakes at Different Plate Margins1.2.16What is an Earthquake?1.2.17Measuring Earthquakes1.2.18Immediate Responses to Earthquakes1.2.19Long-Term Responses to Earthquakes1.2.20Case Studies: The L'Aquila Earthquake1.2.21Case Studies: The Kashmir Earthquake1.2.22Earthquake Case Study: Chile 20101.2.23Earthquake Case Study: Nepal 20151.2.24Reducing the Impact of Tectonic Hazards1.2.25Protecting & Planning1.2.26Living with Tectonic Hazards 21.2.27End of Topic Test - Tectonic Hazards1.2.28Exam-Style Questions - Tectonic Hazards1.2.29Tectonic Hazards - Statistical Skills1.2.30Diagnostic Misconceptions - Lava1.2.31Diagnostic Misconceptions - Locations of Volcanoes1.2.32Diagnostic Misconceptions - Focus vs Epicentre1.2.33Diagnostic Misconceptions - Plates Sliding
1.3

Weather Hazards

1.3.1Winds & Pressure1.3.2The Global Atmospheric Circulation Model1.3.3Surface Winds1.3.4UK Weather Hazards1.3.5Changing Weather in the UK1.3.6Tropical Storms1.3.7Tropical Storm Causes1.3.8Features of Tropical Storms1.3.9The Structure of Tropical Storms1.3.10The Effect of Climate Change on Tropical Storms1.3.11The Effects of Tropical Storms1.3.12Responses to Tropical Storms1.3.13Reducing the Effects of Tropical Storms1.3.14Tropical Storms Case Study: Katrina - Effects1.3.15Tropical Storms Case Study: Katrina - Responses1.3.16Tropical Storms Case Study: Haiyan1.3.17UK Weather Hazards Case Study: Somerset 20141.3.18Effects & Responses: Somerset 20141.3.19End of Topic Test - Weather Hazards1.3.20Exam-Style Questions - Weather Hazards1.3.21Weather Hazards - Statistical Skills
1.4

Climate Change

1.4.1Climate Change1.4.2Evidence for Climate Change1.4.3Natural Causes of Climate Change1.4.4Human Causes of Climate Change1.4.5Effects of Climate Change on the Environment1.4.6Effects of Climate Change on People1.4.7Climate Change Mitigation Strategies1.4.8Adaptation to Climate Change1.4.9End of Topic Test - Climate Change1.4.10Exam-Style Questions - Climate Change1.4.11Climate Change - Statistical Skills1.4.12Diagnostic Misconceptions - Greenhouse Effect1.4.13Diagnostic Misconceptions - 1°C change in Temp.
2

The Living World

2.1

Ecosystems

2.1.1Ecosystems2.1.2Food Chains & Webs2.1.3Ecosystem Cascades2.1.4Global Ecosystems2.1.5Ecosystem Case Study: Freshwater Ponds2.1.6Diagnostic Misconceptions - Ecosystems vs Biomes2.1.7Diagnostic Misconceptions - Species Adaptations
2.2

Tropical Rainforests

2.2.1Tropical Rainforests2.2.2Interdependence of Tropical Rainforests2.2.3Adaptations of Plants to Rainforests2.2.4Adaptations of Animals to Rainforests2.2.5Biodiversity of Tropical Rainforests2.2.6Deforestation2.2.7Impacts of Deforestation2.2.8Case Study: Deforestation in the Amazon Rainforest2.2.9Why Protect Rainforests?2.2.10Sustainable Management of Rainforests2.2.11Case Study: Malaysian Rainforest2.2.12End of Topic Test - Tropical Rainforests2.2.13Exam-Style Questions - Tropical Rainforests2.2.14Deforestation - Statistical Skills2.2.15Diagnostic Misconceptions - Rainfall
2.3

Hot Deserts

2.3.1Hot Deserts2.3.2Interdependence in Hot Deserts2.3.3Adaptation of Plants to Hot Deserts2.3.4Adaptation of Animals to Hot Deserts2.3.5Biodiversity in Hot Deserts2.3.6Case Study: Sahara Desert2.3.7Desertification2.3.8Reducing the Risk of Desertification2.3.9Case Study: Thar Desert2.3.10End of Topic Test - Hot Deserts2.3.11Exam-Style Questions - Hot Deserts2.3.12Diagnostic Misconceptions - Location of Hot Desert
2.4

Tundra & Polar Environments

2.4.1Overview of Cold Environments2.4.2Interdependence of Cold Environments2.4.3Adaptations of Plants to Cold Environments2.4.4Adaptations of Animals to Cold Environments2.4.5Biodiversity in Cold Environments2.4.6Case Study: Alaska2.4.7Sustainable Management2.4.8Case Study: Svalbard2.4.9End of Topic Test - Tundra & Polar Environments2.4.10Exam-Style Questions - Cold Environments2.4.11Diagnostic Misconceptions - Permafrost
3

Physical Landscapes in the UK

3.1

The UK Physical Landscape

3.1.1The UK Physical Landscape3.1.2Examples of the UK's Landscape3.1.3Diagnostic Misconceptions - Weathering vs Erosion
3.2

Coastal Landscapes in the UK

3.2.1Types of Wave3.2.2Weathering3.2.3Mass Movement3.2.4Processes of Erosion3.2.5Wave-Cut Platforms3.2.6Headlands & Bays3.2.7Caves, Arches & Stacks3.2.8Longshore Drift3.2.9Sediment Transportation3.2.10Deposition3.2.11Spits, Bars & Sand Dunes3.2.12Coastal Management - Hard Engineering3.2.13Coastal Management - Soft Engineering3.2.14Case Study: Landforms on the Dorset Coast3.2.15Coastal Management - Managed Retreat3.2.16Coastal Management Case Study - Holderness3.2.17Coastal Management Case Study: Swanage3.2.18Coastal Management Case Study - Lyme Regis3.2.19End of Topic Test - Coastal Landscapes in the UK3.2.20Exam-Style Questions - Coasts3.2.21Diagnostic Misconceptions - Swash & Backwash
3.3

River Landscapes in the UK

3.3.1The Long Profile of a River3.3.2The Cross Profile of a River3.3.3Vertical & Lateral Erosion3.3.4River Valley Case Study - River Tees3.3.5Processes of Erosion3.3.6Sediment Transport3.3.7River Deposition3.3.8Waterfalls & Gorges3.3.9Interlocking Spurs3.3.10Meanders3.3.11Oxbow Lakes3.3.12Floodplains3.3.13Levees3.3.14Estuaries3.3.15Case Study: The River Clyde3.3.16River Management3.3.17Hydrographs3.3.18Flood Defences - Hard Engineering3.3.19Flood Defences - Soft Engineering3.3.20River Management Case Study - Boscastle3.3.21River Management Case Study - Banbury3.3.22End of Topic Test - River Landscapes in the UK3.3.23Exam-Style Questions - Rivers3.3.24Diagnostic Misconceptions - Upper Course3.3.25Diagnostic Misconceptions - Deposition
3.4

Glacial Landscapes in the UK

3.4.1The UK in the Last Ice Age3.4.2Glacial Processes3.4.3Glacial Landforms Caused by Erosion3.4.4Tarns, Corries, Glacial Troughs & Truncated Spurs3.4.5Types of Moraine3.4.6Drumlins & Erratics3.4.7Snowdonia3.4.8Land Use in Glaciated Areas3.4.9Conflicts in Glacial Landscapes3.4.10Tourism in Glacial Landscapes3.4.11Coping with Tourism Impacts in Glacial Landscapes3.4.12Case Study - Lake District3.4.13End of Topic Test - Glacial Landscapes in the UK3.4.14Exam-Style Questions - Glacial Landscapes3.4.15Diagnostic Misconceptions - Glacial Retreat
4

Urban Issues & Challenges

4.1

Urban Issues & Challenges

4.1.1Urbanisation4.1.2Factors Causing Urbanisation4.1.3Megacities4.1.4Urbanisation Case Study: Lagos4.1.5Urbanisation Case Study: Rio de Janeiro4.1.6UK Cities4.1.7Case Study: Urban Regen Projects - Manchester4.1.8Case Study: Urban Change in Liverpool4.1.9Case Study: Urban Change in Bristol4.1.10Sustainable Urban Life4.1.11Reducing Traffic Congestion4.1.12End of Topic Test - Urban Issues & Challenges4.1.13Exam-Style Questions - Urban Issues & Challenges4.1.14Urban Issues -Statistical Skills4.1.15Diagnostic Misconceptions - Urbanisation4.1.16Diagnostic Misconceptions - Megacities
5

The Changing Economic World

5.1

The Changing Economic World

5.1.1Measuring Development5.1.2Limitations of Developing Measures5.1.3Classifying Countries Based on Wealth5.1.4The Demographic Transition Model5.1.5Stages of the Demographic Transition Model5.1.6Physical Causes of Uneven Development5.1.7Historical Causes of Uneven Development5.1.8Economic Causes of Uneven Development5.1.9Consequences of Uneven Development5.1.10How Can We Reduce the Global Development Gap?5.1.11Case Study: Tourism in Kenya5.1.12Case Study: Tourism in Jamaica5.1.13Case Study: Economic Development in India5.1.14Case Study: India's Changing Industrial Structure5.1.15Case Study: TNCs in India5.1.16Case Study: India's Relationship with the World5.1.17Case Study: Aid Received by India5.1.18Case Study: Impacts of Development in India5.1.19Case Study: Economic Development in Nigeria5.1.20Case Study: Nigeria's Industries5.1.21Case Study: TNCs in Nigeria5.1.22Case Study: Nigeria's Relationship with the World5.1.23Case Study: Aid in Nigeria5.1.24Case Study: Impacts of Development in Nigeria5.1.25End of Topic Test - The Changing Economic World5.1.26Exam-Style Questions - The Changing Economic World5.1.27Changing Economic World - Statistical Skills5.1.28Diagnostic Misconceptions - Decreasing Birth Rate5.1.29Diagnostic Misconceptions - Inequality5.1.30Diagnostic Misconceptions - African Development
5.2

Economic Development in the UK

5.2.1Causes of Economic Change in the UK5.2.2The UK's Post-Industrial Economy5.2.3The Impacts of UK Industry on the Environment5.2.4Change in the UK's Rural Areas5.2.5Transport in the UK5.2.6The North-South Divide5.2.7Regional Differences in the UK5.2.8The UK's Links to the World
6

The Challenge of Resource Management

6.1

Resource Management

6.1.1Global Distribution of Resources6.1.2Uneven Distribution of Resources6.1.3Food in the UK6.1.4Agribusiness6.1.5Demand for Water in the UK6.1.6Water Pollution in the UK6.1.7Matching Supply & Demand of Water in the UK6.1.8The UK's Energy Mix6.1.9Issues with Sources of Energy6.1.10Resource Management - Statistical Skills
6.2

Food

6.2.1Areas of Food Surplus & Food Deficit6.2.2Increasing Food Consumption6.2.3Food Supply & Food Insecurity6.2.4Impacts of Food Insecurity6.2.5Increasing Food Supply6.2.6Case Study: Thanet Earth6.2.7Creating a Sustainable Food Supply6.2.8Case Study: Agroforestry in Mali6.2.9End of Topic Test - Food6.2.10Exam-Style Questions - Food6.2.11Food - Statistical Skills6.2.12Diagnostic Misconceptions - Amount of Food
6.3

Water

6.3.1Water Surplus & Water Deficit6.3.2Increasing Water Consumption6.3.3What Affects the Availability of Water?6.3.4Impacts of Water Insecurity6.3.5Increasing Water Supplies6.3.6Case Study: Water Transfer in China6.3.7Sustainable Water Supply6.3.8Case Study: Kenya's Sand Dams6.3.9Case Study: Lesotho Highland Water Project6.3.10Case Study: Wakel River Basin Project6.3.11Exam-Style Questions - Water6.3.12Water - Statistical Skills
6.4

Energy

6.4.1Global Demand for Energy6.4.2Increasing Energy Consumption6.4.3Factors Affecting Energy Supply6.4.4Impacts of Energy Insecurity6.4.5Increasing Energy Supply - Solar6.4.6Increasing Energy Supply - Water6.4.7Increasing Energy Supply - Wind6.4.8Increasing Energy Supply - Nuclear6.4.9Increasing Energy Supply - Fossil Fuels6.4.10Carbon Footprints6.4.11Energy Conservation6.4.12Case Study: Rice Husks in Bihar6.4.13Exam-Style Questions - Energy6.4.14Energy - Statistical Skills

Practice questions on Flood Defences - Hard Engineering

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

  1. 1
    What do we call a large wall built across a river in the upper course?Multiple choice
  2. 2
    With channel straightening, which areas are more at risk of flooding?Multiple choice
  3. 3
    In the context of flood management, how do dams and reservoirs reduce the risk of flooding in the upper course of a river?Multiple choice
  4. 4
    What is a significant environmental consequence of constructing dams for flood defense?Multiple choice
  5. 5
    How does channel straightening help in reducing flood risks in certain regions?Multiple choice
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Hydrographs

Flood Defences - Soft Engineering