Clean Water, Shared Responsibility

Overview

Lesson 5 of 6 in Our Blue Planet: Water Cycle. Students investigate how pollution travels “up the pipe” from homes, roads and workplaces into waterways, then work in stakeholder groups to recommend fair, evidence-informed actions that protect water as taonga.

Learning intentions

• WALT explain why communities must protect water quality and use water responsibly.
• WALT describe how pollutants can move from land and homes into waterways.
• WALT explain one purpose of sewage treatment.
• WALT justify actions that protect our local awa and living things.

Success criteria

• I can explain how pollution affects waterways and living things.
• I can describe one purpose of sewage treatment.
• I can trace how a pollutant can travel from a home or road to an awa.
• I can justify an action that protects water as taonga.

Curriculum links

• Understand how human actions affect the quality and sustainability of freshwater environments.
• Investigate and explain relationships between systems, including homes, treatment plants, land and waterways.
• Use scientific evidence and explanations to make decisions about environmental issues.
• Develop the key competencies of thinking, participating and contributing, managing self, and relating to others, with links to kaitiakitanga and hauora.

Lesson structure (45 minutes)

1. 0–5 min – Pollution-source challenge Display a local awa or harbour image and ask: “How could something used at home or on a road end up here?” Open with the hook and local waterway image. In pairs, students list three possible pollution sources, then share one idea. Introduce the WALT and success criteria.

2. 5–12 min – What does ‘up the pipe’ mean? Explain that wastewater and stormwater are different: wastewater travels through pipes to a treatment plant, while rain can wash pollutants directly from roads and land into streams. Show the simplified treatment diagram in the ‘up the pipe’ explanation and treatment diagram. Students identify one purpose of treatment, such as removing solids, harmful microbes or excess nutrients, before water is released.

3. 12–22 min – Pollutant pathway simulation Arrange groups of six. Give each group a starting place—home, road, farm, workshop or school—and a pollutant scenario from the pollutant pathway and investigation sheet. Students use arrows, labels and short notes to trace the pollutant’s movement: source → drain or runoff → stream/awa → living things. Pause halfway for groups to explain their pathway to another group. Emphasise that “out of sight” does not mean “gone”.

4. 22–35 min – Community decision-making hui Assign each group a role: council, whānau, farm, industry, or community/environment group. Give the group a local water-quality problem, such as litter and oil entering a stormwater drain, excess nutrients from land, or unsafe wastewater overflow. Groups use the evidence on the stakeholder problem and action-planning section to agree on two actions and one possible trade-off. Encourage discussion stems: “Our evidence suggests…”, “This could affect…”, “A fair solution might…”, and “We need more evidence about…”.

5. 35–41 min – Council meeting and justification Each group gives a 45-second recommendation. They must name the problem, explain one effect on waterways or living things, and justify one action that protects water as taonga. The class listens for solutions that are effective, practical and fair to people and the environment. Record strong evidence-based actions on the council-meeting prompt and action summary.

6. 41–45 min – Individual reflection and next step Students complete the final section of the individual reflection and exit response: “One way pollution can reach an awa is…”, “Sewage treatment is important because…”, and “Our community should… because…”. Preview Lesson 6: designing a shared water-protection message or action plan.

Resources

• the Clean Water, Shared Responsibility lesson deck
• the pollutant pathway and action-planning worksheet
• Projector or interactive display
• Image of a local awa, stream, lake or harbour
• Board and markers
• Role cards: council, whānau, farm, industry and community/environment group
• Prepared pollutant scenarios and arrow strips
• Optional local stormwater or wastewater map
• Timer

Assessment

• Listen during the simulation for accurate tracing of a pollutant from source to waterway and living things.
• Use the group recommendation to assess explanation of impact, understanding of sewage treatment, and justification of an action.
• Check the individual reflection against the success criteria; identify students needing a treatment-process recap before Lesson 6.

Differentiation

• Provide a simplified, colour-coded treatment diagram and picture-supported vocabulary: pollutant, runoff, wastewater, stormwater, treatment, nutrients, microbes, waterway and taonga.
• Use teacher-guided reading for students who need support, mixed-ability groups, clear role cards and discussion stems. Allow students to draw a pathway or give an oral response instead of writing every explanation.
• Connect discussion to the class’s local awa and acknowledge mana whenua perspectives on water, kaitiakitanga and water as taonga without asking students to speak for iwi or whānau.
• Extension learners evaluate using treated sludge as fertiliser: identify possible benefits and risks, then specify what evidence and safety testing would be needed before recommending its use.