Watershed: Exploring Run-Off and Infiltration in the Classroom
During this inquiry activity the students will be provided with 3 cups. Cup A will contain clean water. The water will be poured into Cup B. Cup B will contain soil on top and one other object at the bottom (such as leaves, tin foil, wood chips, etc.) Cup B and the object will both contain a hole. The water that is poured into Cup B from Cup A will run into Cup C. The students will observe the amount of water in Cup C and the color of the water in Cup C. Then, we will compare the results to answer the questions, "How does _______ affect the water in Cup C?"
1. The students are making a model to understand infiltration and run-off. After an understanding of this model the students will go outside and observe how our rain garden is similar/different from their model and make connections.
2. Ultimately, students will be asked what happens if too much water moves through a system. This will lead to discussions of flooding and the impacts. Also, this will lead into discussions about the movement of pollutants through a system and that impact on the greater ecosystem.
1. Water moves through a system and changes along the way.
2. Objects affect the amount of water and water quality of a system.
3. Paved surfaces impact water shed.
4. If water can't be taken into the soil, it can go through various routes of the water cycle.
8. Rain garden
Context for Use
Resource Type: Activities:Classroom Activity
Grade Level: Primary (K-2)
Description and Teaching Materials
Students should come to this activity with a background that water moves through a system and changes along the way!
GETTING SET UP
Depending on the level of your students the beginning of this experiment may involve prep work. For example, make sure there are large plastic solo cups ready with holes in the bottom. I would make the holes about the size of a pencil. Also, have the other materials ready. This is the part of the lesson where you can be creative! Perhaps the day before the kids even want to help brainstorm ideas for objects to use in the system. I would recommend a sponge, tin foil, clay, and coffee filter to begin with. Make sure that the clay and the tin foil have small holes poked in the bottom since they will not let the water run through like the sponge or the coffee filter. This is something you may wish to bring up to your students, or let them discover it on their own! I would poke holes with a pinhead, so the water can get through, but the holes are not too big. You will also want to prep the soil with a reasonable size scoop, so you can instruct the students to take "two scoops" into their cup. Also, make sure to have the students (or you ahead of time) label their three cups A, B, and C as to not confuse the experiment. You will also need clear glass or plastic containers to keep the run off for observation. This could be anything from a graduated cylinder (if you wanted the students to quantify the amount) or baby food jars. It may also be helpful to have timers, but looking at a second hand on a clock, or setting one on your computer will work too.
To begin this activity, demonstrate the experiment without an object at the bottom of Cup B, just soil. Tell the students to take 2 scoops of soil. Show the students how they will fill Cup A with water from the sink to the line indicated. Then, show them how to dump the water from Cup A into Cup B. Then, observe what comes out the bottom into Cup C. Introduce the word run-off for what is found in Cup C. Talk with the students about the amount and the color of the water. As the water is flowing it will begin to slow. Tell the students that when they do this experiment in their group, they will have someone timing for 1 minute to see how much water comes out of the cup. After 1 minute they will transfer the water in Cup C to a baby food jar for later observation. Review the procedure one more time. "Now, you are going to be putting different objects at the bottom of your cup. How do you think tin foil will affect the water that comes into Cup C? How do you think a sponge will affect the water that comes into Cup C?" Let students discuss predictions.
Put students in cooperative groups of 4. With each foursome they will need three cups (one with each letter), clay, tin foil, sponge, and coffee filter, and soil bucket with scoop. They will also need glass containers. Since there are 4 students in a group, they can switch roles for each experiment. You have the water, soil, object set-up, and timer as the experiment leader. Students will take turns in this position. The other jobs are water pourer, holder of Cup B and holder of Cup C. Holder of Cup C can pour the run-off into the baby food jar. You can tell the students to put the baby food jar with the run-off on their data collection sheet as to not confuse the results. Then, the students clean out all Cups and repeat the process with the next object.
Bring the students back together to collect results.
1. Which object made the most run-off?
2. Which object made the darkest run-off?
3. (EXTENTION TO REAL WORLD)
Is it good to have a lot of run-off? What happens if we don't have any run-off? Data Record Sheet (Microsoft Word 36kB May31 11)
Teaching Notes and Tips
**Please contact MinnAQUA for a CD containing all of their lessons. Their water stewardship lessons are what motivated me to write this lesson and I plan on using most of them in this unit.
2.III.a.1- Students will observe water.