Classroom activity Grade 3 Engineering & Design

Marsh Bend School Water-Saving Redesign Stations

A grade 3 engineering station-rotation activity where teams redesign four spots in a fictional school to save water and compare their fixes against a shared goal.

Grade: Grade 3
Subject: Engineering & Design
Material: Classroom activity
Time: 40 min
Prep: Low prep
Materials: 4 station signs: Bathroom, Kitchen, Garden, Hallway Fountain, Chart paper or a recording sheet at each station, Markers or pencils, A picture of each spot taped to its station sign

Standards

3-5-ETS1-1 NGSS

Define a simple design problem reflecting a need or a want that includes specified criteria for success and constraints on materials, time, or cost.

How this material aligns: At each station teams define a save-more-water success goal and note the limit that the fix cannot stop people from using the spot, the criteria and constraints this standard requires.

All materials for 3-5-ETS1-1 →

3-5-ETS1-2 NGSS

Generate and compare multiple possible solutions to a problem based on how well each is likely to meet the criteria and constraints of the problem.

How this material aligns: Teams compare their own redesign at each station against another team's idea and pick the one that saves more water, the multiple-solution comparison this standard names.

All materials for 3-5-ETS1-2 →

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This material is in the public domain (CC0) and may be copied, edited, and shared freely, without attribution. Updated 2026-07-23.

Objectives

Students will name a water-saving goal and one limit for each spot in the school.
Students will design a fix that saves water at each station.
Students will compare two fixes and choose the one that saves more water.

Vocabulary

Key words: conserve, redesign, goal, compare

Teacher overview

This is a four-station rotation for teams of three to four students. Marsh Bend School wastes water in four spots, and teams work as design engineers to fix each one. Each station names a spot and a way water is being wasted there, and the team designs a change that saves water while still letting people use the spot. As teams rotate, they read the fixes an earlier team wrote and compare them to their own, so the activity teaches both designing a solution and weighing one solution against another.

Activity Directions

Before class, set up four stations around the room with signs and pictures: Bathroom (a tap left running), Kitchen (a full sink used to rinse one cup), Garden (a hose watering the sidewalk, not the plants), and Hallway Fountain (a drip that never stops). Note for teachers: the U.S. Environmental Protection Agency estimates that a tap dripping once a second can waste more than 3,000 gallons of water in a year, which is worth sharing at the fountain station.
Divide the class into four teams and send each team to a different station to start. Explain the goal that is the same at every station: design a change that saves water but still lets people use the spot.
At their station, the team writes the water-saving goal in their own words and names one limit, which is that the fix cannot stop people from using the spot for its real job.
The team designs one fix for that station and writes or draws it on the chart paper, such as a spring handle that shuts the tap when you let go.
After four minutes, rotate every team one station clockwise. At the new station, the team first reads the fix already written, then adds a different fix of its own below it.
Keep rotating every four minutes until each team has visited all four stations and every station has several fixes on its chart.
Send teams back to their starting station to read all the fixes collected there and circle the one they think saves the most water.
End the activity when each starting team has chosen a best fix for its station. Gather the class for the debrief.
Debrief with two questions: "Which fix did your team choose, and why does it save more water than the others?" and "What limit did you have to respect at your station?"

From Water for Schools (waterforschools.org). This material is in the public domain (CC0) and may be copied, edited, and shared freely.

Answer Key

Question: What is the shared design goal at every station? Answer: The goal is to save water at the spot while still letting people use it for its real job, such as washing hands or watering plants.
Question: Why does every station have a limit? Answer: A fix that saves water but stops people from using the spot fails the real goal; the limit keeps the design useful, like a fountain that still gives a drink but does not drip.
Question: Give one strong fix for the running-tap station and say why it saves water. Answer: Accept a spring or push handle that shuts the tap when released, a smaller flow, or a sign to turn it off, each with a reason that it stops water from running when no one needs it.

Differentiation

Support

Give these teams a short list of picture choices at each station so they can point to a fix and then explain it, rather than inventing one from a blank page. Pair them with a rotation buddy who reads the station sign aloud.

Extension

Ask these teams to rank all the fixes at one station from most to least water saved and to defend their top choice to the class. Challenge them to design a fix that saves water in two of the four spots at once.

ELL supports

Pre-teach "conserve," "waste," and "fix" with pictures of a running tap and a closed tap. Provide sentence frames on each chart, such as "This fix saves water because ___." Allow drawings with labels instead of full sentences at each station.

Extensions

Have the class walk the real school and look for the same four kinds of water waste, then propose one fix the school could actually try. A short note to the office sharing the best idea turns the activity into a real conservation project.