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  2. Water clarity - Wikipedia

    en.wikipedia.org/wiki/Water_clarity

    Water clarity influences human perceptions of water quality, recreational safety, aesthetic appeal, and overall environmental health. [10] [11] Tourists visiting the Great Barrier Reef were willing to pay to improve the water clarity conditions for recreational satisfaction. [12] Water clarity also influences waterfront property values.

  3. Secchi disk - Wikipedia

    en.wikipedia.org/wiki/Secchi_disk

    Different kinds of Secchi disks. A marine style on the left and the freshwater version on the right. The Secchi depth is reached when the reflectance equals the intensity of light backscattered from the water. 1.7 divided into this depth in metres yields an attenuation coefficient (also called an extinction coefficient), for the available light averaged over the Secchi disk depth.

  4. Turbidity - Wikipedia

    en.wikipedia.org/wiki/Turbidity

    Turbid creek water caused by heavy rains. The measurement of turbidity is a key test of both water clarity and water quality. [citation needed] There are two standard units for reporting turbidity: Formazin Nephelometric Units (FNU) from ISO 7027 and Nephelometric Turbidity Units (NTU) from USEPA Method 180.1.

  5. APHA color - Wikipedia

    en.wikipedia.org/wiki/APHA_color

    APHA color, also referred to as the Hazen scale, and more appropriately as the Platinum Cobalt(Pt/Co) scale, [1] is a color standard named for the American Public Health Association and defined by ASTM D1209. [2] It was originally intended to describe the color of waste water, but its usage has expanded to include other industrial applications ...

  6. Trophic state index - Wikipedia

    en.wikipedia.org/wiki/Trophic_state_index

    Although the term "trophic index" is commonly applied to lakes, any surface water body may be indexed. The TSI of a water body is rated on a scale from zero to one hundred. [1] Under the TSI scale, water bodies may be defined as: [1] oligotrophic (TSI 0–40, having the least amount of biological productivity, "good" water quality);

  7. Water quality - Wikipedia

    en.wikipedia.org/wiki/Water_quality

    Individuals interested in monitoring water quality who cannot afford or manage lab scale analysis can also use biological indicators to get a general reading of water quality. One example is the IOWATER volunteer water monitoring program of Iowa , which includes an EPT indicator key.