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Unit Plan: Schoolyard Inquiries Time: 1 class period Setting: schoolyard Objectives:

Students will know how soil compaction affects water infiltration and will be able to design and carry out a simple experiment to test their ideas.  


Lesson Overview:

Students will collect percolation data and determine the degree of soil compaction based on the time it takes for water to percolate into the soil.

  • Number 10 coffee can with top and bottom removed
  • Permanent markers
  • Metric rulers
  • Watch with second hand or stop watches
  • Data collection sheet
  • Pencils
  • Class data collection sheet
  • Containers for carrying water
  • Containers marked at 50 mL
  • Science Journals
  • Scissors to clip grass


A how-to video on setting up a percolation experiment:



  1. Divide class into learning pairs. Give each pair a soup can with the top and bottom removed. Be sure sharp edges have been flattened with pliers. Ask students to make 4-6 marks with a permanent pen 2cm from the bottom of their can.
  2. Assign an area of the schoolyard to each pair. You may need to conduct this research on half of the schoolyard at a time depending on the size of the schoolyard and the location of the different areas. The goal is to get percolation data from each area.
  3. Ask students to choose their first percolation site within their area. Invite students to clear leaves and clip grass to the ground using scissors.
  4.  Invite students to twist the can into the ground 2cm (to the marks they made). Ask students to pour 50 ml of water into the can and time how long it takes for the water to soak into the soil.
  5. Ask students to write their time on the student data sheet.
  6. Gather as a class and compile data on the class percolation data sheet.
  7. The following questions may be included in the class discussion or students may respond in their science journals. What did you notice? Where do you think rainwater would go if it falls on an area with a high percolation rate vs. one with a low percolation rate?


Lesson Resources:
Benchmarks for Science Literacy: 1B Scientific Inquiry 2A Patterns and Relationships 4C Processes that shape the earth NYS Standards: MST 1 - Mathematical analysis, scientific inquiry, and engineering design MST 4- Physical setting, living environment and nature of science
Next Generation Science Standards
Science and Engineering Practices: Asking questions and defining problems Planning and carrying out investigations