Lower the secchi disk into the water. Assessment Ideas Students can test different areas of an inland lake or pond, noting differences in clarity. The water body can then be mapped and data entered into a journal or portfolio. Have students design and carry out an experiment that shows what different factors influence water clarity. In reference to water, the amount of separate individual particles suspended in the water.
Clarity is dependent on suspended particulate matter in the water.
A weighted, white colored disk is attached to a rope. In this case, the disk is lowered over the side of the boat.