The study looked at how much dirt is in the water and how murky it looks in different areas. They found that the amount of dirt in the water is closely related to how murky it looks. By using a specific formula, they can estimate the amount of dirt in the water just by looking at how murky it is. This means that we can use how murky the water looks to figure out how much dirt is in it, which can help us understand the health of the water in different places.