Water Tank Calculator Curriculum Activity

Suitable for Primary (Years 5-6)

Victorian Curriculum Links:

Activity Description

The Water Tank Calculator activity engages students in the calculation of roof runoff on a school building to determine a suitably sized water tank. The students develop skills in calculating area. Students are then invited to discuss the environmental benefits of harvesting water.

Key Concepts

  • Water Harvesting
  • Water Scarcity
  • Water Resources

Key Learning Intentions

  1. Students will be able to identify the average annual rainfall for their region
  2. Students will be able to calculate roof runoff
  3. Students will be able to suggest water harvesting solutions for their school

Suggestions for Assessment


  1. Participation in the Water Tank Calculator activity
  2. Completion of the Discussion questions below


1. Worksheet

Complete the Student Worksheet for the Water Tank Activity.

2. Discussion

  1. List the positives of installing a water tank. What are the environmental benefits?
  2. How could this water be used within the school?
  3. Refer to the average annual rainfall map and locate Mildura and Melbourne. What are the differences in rainfall and how would this affect a school located in Mildura?

Suggested ResourceSmart Schools Module Links

Undertaking the activity as described above links to the ResourceSmart Schools Water Module – actions B1.2, B1.3

Below is a list of extension activities that link to additional actions of the Water module:

  1. Conduct a water tank calculation on a building at your own home. Present the findings to your parents and classmates (ResourceSmart Schools Water Module – action C3.5)
  2. Conduct an audit to determine other possible water tank locations within your school (ResourceSmart Schools Water Module – actions A1.1, A3.12, A4.6, A4.9, B1.3, B1.4, C2.1)
  3. Design a water system for your school using the proposed water tanks as a starting point (ResourceSmart Schools Water Module – actions B1.1, B1.3)
  4. Investigate the EPA Guidelines for the use of rain water. A copy of EPA Victoria’s “Rainwater use in and around the home” can be downloaded here. List the uses that are considered acceptable and not acceptable (ResourceSmart Schools Water Module – actions A4.7, C2.1)
  5. Create a learning story detailing the process of your water tank calculation. Present your findings to the school and wider community in newsletters or on the school website (ResourceSmart Schools Water Module – actions C1.1, C1.3)
  6. Apply for water related grants or for donations from your local hardware store for the donation and installation of a new water tank (ResourceSmart Schools Water Module – action A2.3)

Speak to your CERES ResourceSmart Schools Facilitator about further links to the Water Module.

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