|Spend the time||outdoors|
|Appropriate for kids||no|
A secchi disk
The Secchi Dip-In
Tracking water quality is an important tool for measuring the effects of human activity on local waterways. An estimate of water quality is transparency. The more polluted the water, the less transparent.
In this project, participants take transparency readings of their local waterways using a secchi disk. This black and white disk is lowered into the water until it is no longer visible. The depth of the disk reflects water transparency.
Participants take just one reading per year, preferably during official "dip-in" period in early July. Active since 1994, the Secchi Dip-In project currently tracks over 2,000 waterbodies.