Gary Cooper & Stefanie Harrison

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Presentation transcript:

Gary Cooper & Stefanie Harrison 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 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

Sources 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

Impact on Organisms

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

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