Source: https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-23-case-study-the-river-eden-management [Revision notes](https://senecalearning.com/en-gb/revision-notes.md) › [IGCSE](https://senecalearning.com/en-gb/revision-notes/igcse.md) › [Geography](https://senecalearning.com/en-gb/revision-notes/igcse/geography.md) › [Edexcel IGCSE](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse.md) › Case Study: The River Eden - Management # Case Study: The River Eden - Management Geography: Edexcel IGCSE, topic 1.1.23 ## Impacts of Management Strategies on the River Eden The River Eden is vulnerable to bursting its banks. Cumbria's climate is wet, precipitation is high and the rocks are impermeable, leading to a lot of runoff. How is the river managed? ### Flood walls and embankments ![Flood walls and embankments](https://image-v2.cdn.app.senecalearning.com/2018-04/dac644fa-5bbb-4dc8-ba3b-971431e86d4f/shutterstock_1007081728.jpg) - Flood walls and embankments are artificial barriers built on river banks. - They effectively increase the height of the river banks. - Carlisle is currently protected by 10 kilometres of flood walls and embankments. - In 2019, a new £25 million flood defence programme was being developed. ### Reservoirs ![Reservoirs](https://image-v2.cdn.app.senecalearning.com/2018-04/94c972e6-924d-4a32-9772-966dc3fa4c20/shutterstock_537334648.jpg) - 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. - Downstream of reservoirs, water flow is limited and there is not much material left to be deposited. This can lead to increased erosion and decreased build-up of the floodplain. - South-east of Carlisle, a reservoir has been created by damming Castle Carrock beck. ### Planting trees ![Planting trees](https://image-v2.cdn.app.senecalearning.com/2018-04/0e241a48-d4c2-4bf2-99bc-b43286d14718/shutterstock_316507148.jpg) - Planting trees in river valleys increases interception of rain water and the lag time between rain falling and it making its way into the river channel. - As a result, the energy of the river will decrease and so meanders will form more slowly. - £500,000 was spent planting 1,000 trees near the River Eden, trying to reduce flooding and soil erosion. ### Channel management ![Channel management](https://image-v2.cdn.app.senecalearning.com/2018-04/1b22e8ea-2edb-4807-9c45-79ece78ff167/shutterstock_711414538.jpg) - Channel straightening involves removing bends and meanders by adding artificial straight channels. - Channel straightening was common in the River Eden basin in the past. - Artificial meanders increase deposition by decreasing a river's velocity. - Recently, artificial meanders have been installed to try to restore the Eden basin to its natural state. ## Test yourself on Case Study: The River Eden - Management - How many trees have been planted near Dalston with the aim of reducing flooding and soil erosion? - Where has a reservoir been created by damming Castle Carrock beck? - Why is the River Eden vulnerable to flooding? [Practise this topic for free](https://app.senecalearning.com/classroom/course/ef6d2f62-5eb8-4168-aaaf-48efdb77968e/section/6e5ef2be-4e59-4eb5-af73-4c055c4c0cb7/session) - Previous topic: [1.1.22 Case Study: The River Eden - Geology](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-22-case-study-the-river-eden-geology.md) - Next topic: [1.1.24 Case Study: The River Eden - Human Activity](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-24-case-study-the-river-eden-human-activity.md) ## Geography: Edexcel IGCSE contents ### 1 Physical Geography - 1.1 River Environments - [1.1.1 Weathering](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-1-weathering.md) - [1.1.2 Mass Movement](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-2-mass-movement.md) - [1.1.3 Erosion](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-3-erosion.md) - [1.1.4 Transportation](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-4-transportation.md) - [1.1.5 Deposition](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-5-deposition.md) - [1.1.6 River Landforms: Waterfalls & Gorges](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-6-river-landforms-waterfalls-and-gorges.md) - [1.1.7 River Landforms: Interlocking Spurs](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-7-river-landforms-interlocking-spurs.md) - [1.1.8 River Landforms: Flood Plains](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-8-river-landforms-flood-plains.md) - [1.1.9 River Landforms: Point Bars](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-9-river-landforms-point-bars.md) - [1.1.10 River Landforms: Levees](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-10-river-landforms-levees.md) - [1.1.11 River Landforms: Meanders](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-11-river-landforms-meanders.md) - [1.1.12 River Landforms: Oxbow Lakes](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-12-river-landforms-oxbow-lakes.md) - [1.1.13 River Landscape Changes: Long Profile](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-13-river-landscape-changes-long-profile.md) - [1.1.14 River Landscape Changes: Cross Profile](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-14-river-landscape-changes-cross-profile.md) - [1.1.15 Vertical & Lateral Erosion](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-15-vertical-and-lateral-erosion.md) - [1.1.16 Flood Risk Factors](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-16-flood-risk-factors.md) - [1.1.17 Human Activities on Rivers](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-17-human-activities-on-rivers.md) - [1.1.18 River Management: Hard Engineering](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-18-river-management-hard-engineering.md) - [1.1.19 River Management: Soft Engineering](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-19-river-management-soft-engineering.md) - [1.1.20 Case Study: The River Eden - Landforms](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-20-case-study-the-river-eden-landforms.md) - [1.1.21 Case Study: The River Eden - Climate](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-21-case-study-the-river-eden-climate.md) - [1.1.22 Case Study: The River Eden - Geology](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-22-case-study-the-river-eden-geology.md) - [1.1.23 Case Study: The River Eden - Management](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-23-case-study-the-river-eden-management.md) - [1.1.24 Case Study: The River Eden - Human Activity](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-24-case-study-the-river-eden-human-activity.md) - [1.1.25 End of Topic Test - River Environments](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-1-25-end-of-topic-test-river-environments.md) - 1.2 Coastal Environments - [1.2.1 Weathering](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-1-weathering.md) - [1.2.2 Mass Movement](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-2-mass-movement.md) - [1.2.3 Erosion](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-3-erosion.md) - [1.2.4 Deposition](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-4-deposition.md) - [1.2.5 Longshore Drift](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-5-longshore-drift.md) - [1.2.6 Sediment Transportation](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-6-sediment-transportation.md) - [1.2.7 Wave Action on Coasts](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-7-wave-action-on-coasts.md) - [1.2.8 Other Factors Influencing Coasts](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-8-other-factors-influencing-coasts.md) - [1.2.9 Coastal Landforms: Wave-cut Platforms & Cliffs](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-9-coastal-landforms-wave-cut-platforms-and-cliffs.md) - [1.2.10 Coastal Landforms: Headlands & Bays](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-10-coastal-landforms-headlands-and-bays.md) - [1.2.11 Coastal Landforms: Caves, Arches & Stacks](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-11-coastal-landforms-caves-arches-and-stacks.md) - [1.2.12 Coastal Deposition](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-12-coastal-deposition.md) - [1.2.13 Spits, Bars & Sand Dunes](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-13-spits-bars-and-sand-dunes.md) - [1.2.14 Human Activity on Coasts](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-14-human-activity-on-coasts.md) - [1.2.15 Coastal Defences: Hard Engineering](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-15-coastal-defences-hard-engineering.md) - [1.2.16 Coastal Defences: Soft Engineering](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-16-coastal-defences-soft-engineering.md) - [1.2.17 Coastal Defences: Managed Retreat](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-17-coastal-defences-managed-retreat.md) - [1.2.18 Case Study: Holderness Coast Overview](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-18-case-study-holderness-coast-overview.md) - [1.2.19 Case Study: Holderness Coast Management](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-19-case-study-holderness-coast-management.md) - [1.2.20 Case Study: Holderness Coast Defences](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-20-case-study-holderness-coast-defences.md) - [1.2.21 End of Topic Test - Coastal Environments](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-2-21-end-of-topic-test-coastal-environments.md) - 1.3 Hazardous Environments - Tropical Cyclones - [1.3.1 Characteristics of a Tropical Cyclone](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-3-1-characteristics-of-a-tropical-cyclone.md) - [1.3.2 Structure of a Tropical Cyclone](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-3-2-structure-of-a-tropical-cyclone.md) - [1.3.3 Physical Hazards of Tropical Cyclones](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-3-3-physical-hazards-of-tropical-cyclones.md) - [1.3.4 The Impacts of Tropical Cyclones](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-3-4-the-impacts-of-tropical-cyclones.md) - [1.3.5 Responses to Tropical Cyclones](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-3-5-responses-to-tropical-cyclones.md) - [1.3.6 Vulnerability to Tropical Cyclones](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-3-6-vulnerability-to-tropical-cyclones.md) - [1.3.7 Preparing for Tropical Cyclones](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-3-7-preparing-for-tropical-cyclones.md) - [1.3.8 Case Study: Katrina](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-3-8-case-study-katrina.md) - [1.3.9 Case Study: Nargis](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-3-9-case-study-nargis.md) - 1.4 Hazardous Environments - Earthquakes & Volcanoes - [1.4.1 Earthquakes](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-4-1-earthquakes.md) - [1.4.2 Features of an Earthquake](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-4-2-features-of-an-earthquake.md) - [1.4.3 Types of Earthquake](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-4-3-types-of-earthquake.md) - [1.4.4 Case Study: L'Aquila](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-4-4-case-study-laquila.md) - [1.4.5 Case Study: Chile](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-4-5-case-study-chile.md) - [1.4.6 Case Study: Japan & Pakistan - Planning](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-4-6-case-study-japan-and-pakistan-planning.md) - [1.4.7 Volcanoes](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-4-7-volcanoes.md) - [1.4.8 Types of Volcanoes](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-4-8-types-of-volcanoes.md) - [1.4.9 Volcanic Eruptions](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/1-4-9-volcanic-eruptions.md) ### 2 Human Geography - 2.1 Economic Activity & Energy - [2.1.1 Increasing Energy Consumption](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-1-1-increasing-energy-consumption.md) - [2.1.2 Non-Renewable Energy - Nuclear](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-1-2-non-renewable-energy-nuclear.md) - [2.1.3 Non-Renewable Energy - Fossil Fuels](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-1-3-non-renewable-energy-fossil-fuels.md) - [2.1.4 Renewable Energy - Solar](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-1-4-renewable-energy-solar.md) - [2.1.5 Renewable Energy - Water & Bio](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-1-5-renewable-energy-water-and-bio.md) - [2.1.6 Renewable Energy - Hydro](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-1-6-renewable-energy-hydro.md) - [2.1.7 Energy - Statistical Skills](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-1-7-energy-statistical-skills.md) - 2.2 Rural Environments - [2.2.1 Rainforests](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-2-1-rainforests.md) - [2.2.2 Temperate Forests](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-2-2-temperate-forests.md) - [2.2.3 Characteristics of a Temperate Forest](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-2-3-characteristics-of-a-temperate-forest.md) - [2.2.4 Goods & Services in Temperate Forests](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-2-4-goods-and-services-in-temperate-forests.md) - [2.2.5 Deserts](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-2-5-deserts.md) - [2.2.6 Tundra](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-2-6-tundra.md) - 2.3 Urban Environments - [2.3.1 Urbanisation in Different Countries](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-3-1-urbanisation-in-different-countries.md) - [2.3.2 Causes of Urbanisation](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-3-2-causes-of-urbanisation.md) - [2.3.3 Consequences of Urbanisation](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-3-3-consequences-of-urbanisation.md) - [2.3.4 Sustainable Urbanisation](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-3-4-sustainable-urbanisation.md) - [2.3.5 Case Study: Rapid Urbanisation in Mexico City](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-3-5-case-study-rapid-urbanisation-in-mexico-city.md) - [2.3.6 End of Topic Test - Urbanisation](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/2-3-6-end-of-topic-test-urbanisation.md) ### 3 Global Issues - 3.1 Fragile Environments & Climate Change - [3.1.1 Natural Causes of Climate Change](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-1-1-natural-causes-of-climate-change.md) - [3.1.2 Effects of Climate Change on the Environment](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-1-2-effects-of-climate-change-on-the-environment.md) - [3.1.3 Effects of Climate Change on People](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-1-3-effects-of-climate-change-on-people.md) - [3.1.4 Impacts of Deforestation](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-1-4-impacts-of-deforestation.md) - [3.1.5 End of Topic Test - Climate Change](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-1-5-end-of-topic-test-climate-change.md) - [3.1.6 Increasing Water Supply](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-1-6-increasing-water-supply.md) - [3.1.7 Sustainable Rainforest Management](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-1-7-sustainable-rainforest-management.md) - 3.2 Globalisation & Migration - [3.2.1 Globalisation - Transport](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-1-globalisation-transport.md) - [3.2.2 Globalisation - Communication Networks & Banking](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-2-globalisation-communication-networks-and-banking.md) - [3.2.3 Push & Pull Factors](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-3-push-and-pull-factors.md) - [3.2.4 TNCs & Globalisation](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-4-tncs-and-globalisation.md) - [3.2.5 Tourism Landscapes](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-5-tourism-landscapes.md) - [3.2.6 The Growth of Tourism](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-6-the-growth-of-tourism.md) - [3.2.7 The Economic Benefits of Tourism](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-7-the-economic-benefits-of-tourism.md) - [3.2.8 The Social & Cultural Benefits of Tourism](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-8-the-social-and-cultural-benefits-of-tourism.md) - [3.2.9 The Economic Costs of Tourism](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-9-the-economic-costs-of-tourism.md) - [3.2.10 The Social & Cultural Costs of Tourism](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-10-the-social-and-cultural-costs-of-tourism.md) - [3.2.11 Managing Tourism - Sustainability](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-11-managing-tourism-sustainability.md) - [3.2.12 Managing Tourism - Quotas & Tourism Hubs](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-2-12-managing-tourism-quotas-and-tourism-hubs.md) - 3.3 Development & Human Welfare - [3.3.1 Ways of Defining Development](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-3-1-ways-of-defining-development.md) - [3.3.2 Different Ways of Measuring Development](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-3-2-different-ways-of-measuring-development.md) - [3.3.3 Environmental Factors Causing Uneven Development](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-3-3-environmental-factors-causing-uneven-development.md) - [3.3.4 Historical Factors Causing Uneven Development](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-3-4-historical-factors-causing-uneven-development.md) - [3.3.5 Economic Factors Causing Uneven Development](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-3-5-economic-factors-causing-uneven-development.md) - [3.3.6 Patterns of Development](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-3-6-patterns-of-development.md) - [3.3.7 How Can we Reduce the Global Development Gap?](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-3-7-how-can-we-reduce-the-global-development-gap.md) - [3.3.8 Top-Down & Bottom-Up Development](https://senecalearning.com/en-gb/revision-notes/igcse/geography/edexcel-igcse/3-3-8-top-down-and-bottom-up-development.md)