Engineering for Flood and Landslide Mitigation

Students learn engineering design best when they build, test, and revise physical models rather than read or watch alone. This topic combines hydrology with hands-on problem solving, so active learning lets students see trade-offs in real time and connect science concepts to real-world decisions.

• 6th Grade
• Science
• 3 activities
• 20 min–55 min

Learning Objectives

1. Design a model system to mitigate the impact of simulated flooding based on specified criteria and constraints.
2. Evaluate the effectiveness of different flood control measures, such as levees and permeable pavement, using quantitative data.
3. Compare and contrast the advantages and disadvantages of at least two different landslide mitigation strategies.
4. Justify the selection of specific materials for a landslide prevention structure, considering properties like strength and permeability.
5. Explain the scientific principles behind flood formation and landslide triggers relevant to engineering solutions.

Problem-Based Learning

⏱ 55 min·Small Groups

Design Lab: Model Flood Control System

Student teams receive a tray with soil formed into a landscape with a marked 'town' at the base of a slope. They design and build a flood mitigation system using available materials (gravel, sponge strips, clay, cardboard) and test it by pouring a measured amount of water at the top of the slope. Teams measure how much water reached the town, analyze their failure points, and complete at least one redesign cycle before presenting their final system.

Prepare & details

Design technologies that can help us predict and prepare for floods.

Facilitation Tip: During the Design Lab, circulate with a timer so every group has at least one test run before redesigning, ensuring equity in iteration time.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Problem-Based Learning

⏱ 40 min·Small Groups

Collaborative Analysis: FEMA Flood Zone Maps

Students examine real FEMA National Flood Hazard Layer maps for a US city available on the FEMA Map Service Center and categorize key areas by flood risk zone. Groups identify which critical infrastructure , schools, hospitals, bridges , sits in high-risk zones and propose one evidence-supported engineered mitigation measure per site, explaining why they chose that approach over alternatives.

Prepare & details

Evaluate the effectiveness of different flood control measures.

Facilitation Tip: For the FEMA Flood Zone Maps activity, ask pairs to annotate one map feature that surprised them and one they now understand differently.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Think-Pair-Share

⏱ 20 min·Pairs

Think-Pair-Share: Bioswale or Levee?

Present students with two mitigation options for a neighborhood prone to flash flooding: a network of bioswales (moderate initial cost, ongoing maintenance, ecological co-benefits) versus a concrete levee (high initial cost, periodic maintenance, no ecological benefit). Pairs evaluate trade-offs using a provided cost and effectiveness table, then share their reasoning. The discussion surfaces how both cost structures and community values shape engineering choices.

Prepare & details

Justify the selection of specific materials for a landslide prevention structure.

Facilitation Tip: In the Think-Pair-Share, require students to sketch a quick cross-section before discussing so quieter learners have a tangible starting point.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Teaching This Topic

Start with the FEMA maps to ground students in real risks before they touch materials. Avoid lecturing on solutions up front; let test failures reveal why distributed systems often outperform solid barriers. Research shows students grasp risk trade-offs more deeply when they experience the limits of their own designs rather than hear abstract warnings.

What to Expect

By the end of these activities, students will justify which engineered system fits a specific landscape and budget, explain why no single solution fits all sites, and identify limitations and risks of their chosen approach.

Watch Out for These Misconceptions

Common Misconception

During Design Lab: Model Flood Control System, watch for students who assume a taller levee is always better.

What to Teach Instead

During the same activity, pause the build phase and ask each group to test a 5 cm and a 10 cm levee on the same slope, then measure overflow volume to show when extra height provides diminishing returns and increases failure risk.

Common Misconception

During Think-Pair-Share: Bioswale or Levee?, watch for students who believe effective mitigation means stopping all water.

What to Teach Instead

During the discussion, hand out two trays: one with a solid barrier and one with a bioswale model. Pour equal amounts of water and let students observe how the bioswale slows and filters while the solid barrier concentrates force and overflows quickly.

Assessment Ideas

Quick Check

After Collaborative Analysis: FEMA Flood Zone Maps, provide a new diagram of a flood-prone neighborhood and ask students to identify two mitigation sites and sketch one solution for each, labeling key parts.

Discussion Prompt

During Think-Pair-Share: Bioswale or Levee?, pose the question, 'If you had to choose between building a large levee or widespread permeable pavement, what factors would you consider to make your decision?' Listen for cost, environmental impact, and effectiveness in their justifications.

Peer Assessment

During Design Lab: Model Flood Control System, have students build simple landslide prevention models, then swap with a partner. Partners use a checklist to evaluate: Did the structure hold? What material seemed most effective? What could be improved? Students return models to revise based on feedback.

Extensions & Scaffolding

• Challenge students who finish early to combine two mitigation strategies into one hybrid system and predict where it would excel or fail.
• For students who struggle, provide pre-labeled landscape diagrams where they can simply match mitigation features to landform types before designing their own.
• Deeper exploration: Invite a local engineer or public works employee to join a virtual Q&A about maintenance costs and long-term performance of real-world systems.

Key Vocabulary

Levee	An embankment, usually made of earth, built alongside a river or stream to prevent flooding of the adjacent land.
Permeable Pavement	A type of pavement that allows water to pass through it into the ground below, reducing surface runoff and helping to recharge groundwater.
Bioswale	A vegetated channel designed to slow down, absorb, and filter stormwater runoff, often used in urban areas.
Retaining Wall	A structure designed to hold back soil or rock, preventing landslides or erosion on sloped terrain.
Runoff	The flow of water over the land surface, which can increase during heavy rainfall or snowmelt and contribute to flooding.