Activity Overview
In this activity, students' will model storm water run-off and its effects on local waterways. They will use a light sensor to determine the turbidity of the water in the model and use data from the model to analyze the effect of storm water run-off on local water turbidity.
Before the Activity
Plug in Light Sensor in Channel 1 of the CBL 2
Download DataMate™ program using the TI-GRAPH LINK™ or the TI Connect™ software
See the attached PDF file for detailed instructions for this activity
Print pages 157 - 163 from the attached PDF file for your class
During the Activity
Distribute the pages to your class
Follow the Activity procedure:
Pour 1000 ml of water in a clear container
Align the flashlight, container of water, and CBL 2™ light sensor so that the light passes through the container of water directly into the light meter
Turn on the flashlight and take an initial reading of light passing through clear water
Add 10 g of dirt to the water and stir
When the dirt dissolves take a turbidity reading using the light sensor
Repeat steps until 50 g of dirt have been added
Record the values and plot amount of dirt versus turbidity
Analyze the effects of storm water run-off on water turbidity
After the Activity
Students' will complete Student Data Collection and Analysis Sheet.
Review student results
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary