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Turbidity

Turbidity. Gary Cooper & Stefanie Harrison. Definition . Measure of cloudiness in the water. Measuring Turbidity . NTU-Nephelometric Turbidity Units JTU-Jackson Turbidity Units. Acceptable Ranges of Turbidity. Designated Use Acceptable Ranges

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Turbidity

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  1. Turbidity Gary Cooper & Stefanie Harrison

  2. Definition • Measure of cloudiness in the water

  3. Measuring Turbidity • NTU-Nephelometric Turbidity Units • JTU-Jackson Turbidity Units

  4. Acceptable Ranges of Turbidity • Designated Use Acceptable Ranges • Recreation 5 NTU (Awwa, 1990) • Aquatic Life < 50 NTU instantaneously or • < 25 NTU for a 10 day average • < 10 NTU for trout waters or                      < 25 NTU for streams (non-trout waters) or                      < 50 NTU for lakes and reservoirs • (non-trout waters) Human Consumption 1 to 5 NTU (up to 5 NTU is allowed if the water supplier can demonstrate that this level does not interfere with: 1) disinfection 2) maintenance of a disinfecting agent 3) microbiological determination

  5. Storms/Flooding People polluting water Leaves Soil Erosion (from building/road construction, forest fires, logging, mining) Waste Discharge Urban Runoff Household pets playing in water Algal growth Bottom feeders (carp)- stir up sediments Decaying plants/animals Sources

  6. Impact on Organisms

  7. Effects of Turbidity • Clogs fish gills • Decreases growth rates • Decreases resistance to disease • Prevents egg and larval development • Smothers eggs of fish and aquatic insects • Really high levels can cause death

  8. Sources • www.fivecreeks.org/monitor/turbidity.html • http://bcn.boulder.co.us/basin/data/FECAL/info/turb.htm • http://www.water.ncsu.edu/watershedss/ info/turbid.html • waterontheweb.org/under/waterquality/turbidity.html

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