This model shows how an oil spill can percolate down through permeable soil. The depth depends on the porosity of the soil.

For detailed instructions on using the program, take a look at the info window from the Percolation model.

Download the StarLogoT source code for the Percolation model:
Download percolation

To run this file you need StarLogoT2002 for the Macintosh.
(download StarLogoT)

Click on one of the pictures to see a quicktime movie of the model: