What is Turbidity?

Turbidity is a measure of water clarity. It describes the degree to which light is scattered by suspended particles such as silt, clay, organic matter, and microscopic organisms. High turbidity can make water appear cloudy or murky, which is often an indicator of poor water quality. It is measured in various units, the most common being Nephelometric Turbidity Units (NTU).

How to Use This Calculator

This calculator uses a standardized empirical relationship between Secchi Disk visibility and turbidity. To use it, simply measure the depth at which a Secchi disk disappears from view in a body of water and enter that value in meters. The formula used for this estimation is derived from environmental monitoring standards: NTU = A / (Depth^B), where we use common coefficients to provide a representative environmental estimate.

Why Measuring Turbidity Matters

Monitoring turbidity is crucial for several reasons. For drinking water, high turbidity can harbor pathogens and reduce the effectiveness of disinfection processes. In aquatic ecosystems, excessive turbidity limits the sunlight reaching underwater plants (macrophytes), which in turn reduces oxygen levels and disrupts the habitat for fish and other aquatic life. Furthermore, high levels of suspended solids can clog fish gills and affect their ability to find food.

Frequently Asked Questions