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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

Turbidity

Gary Cooper & Stefanie Harrison

definition
Definition
  • Measure of cloudiness in the water
measuring turbidity
Measuring Turbidity
  • NTU-Nephelometric Turbidity Units
  • JTU-Jackson Turbidity Units
acceptable ranges of turbidity
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

Sources
effects of turbidity
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
sources1
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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