Water were does it come from
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Water were does it come from and why do we need it! PowerPoint PPT Presentation


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Water were does it come from and why do we need it! http://www.epa.gov/ogwdw/watertreatmentplant/flash/index.html. Water Quality . Water Quality: used to describe the health of a water system. Health of water is determined by: 1. chemical variables/properties

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Water were does it come from and why do we need it!

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Water were does it come from

and

why do we need it!

http://www.epa.gov/ogwdw/watertreatmentplant/flash/index.html


Water Quality

Water Quality: used to describe the health of a water system.

Health of water is determined by:

1. chemical variables/properties

2. physical variables/properties

3. biological (environmental stressors)/properties


Physical Variables include

  • Temperature

    • Low 32°F

    • High 97°

  • Turbidity (NTU): a measure of the clarity of the water (how clear is it?)

    Turbidity (NTU) is often measured by using a Secchi Disk: A flat, white disk lowered into the water by a rope until it is barely visible. At this point, the depth of the disk from the water surface is the recorded secchi disk transparency.

    3. Water Movement


  • Nephelometric Turbidity Units (NTU):

  • 1 NTU – Ideal level

  • 5 NTU - High level


Chemical Variables include

  • Dissolved Oxygen (DO) and other gases

    • Dissolved Oxygen: measure of water quality indicating free oxygen dissolved in water. (average level 9.0 ppm)

    • Must be 4 – 5 ppm to support diverse population of fish

  • pH: The measure of how acidic or basic a substance the acidity, neutrality or basic of a substance.

  • Nitrates: nitrogen compounds used for growth by plants and algae; a compound that can be used by photosynthetic life forms to obtain the nitrogen needed for survival. (drinking water 10mg/l & 90 mg/L warm water fish tolerate)

  • Salinity


Environmental Stressors:

  • Urban runoff

  • Agricultural runoff

  • Industrial inputs

  • Over fishing – impacts populations


Results of Environmental Stressors

  • Decrease in diversity

  • Elimination of intolerant organisms

  • Increase in tolerant organisms

  • Toxic influx and nutrient enrichment causes chemical and environmental changes.

    • Major shift in plant and animal life


Using technology to monitor water quality will help humans provide treatments to improve conditions in Earth’s oceans and freshwater.

Technology and Indicators used:

pH scale: rating of how acidic or basic a substance is; the scale goes from 0 to 14 with 7 being neutral values less than 7 being acidic and values greater than 7 being basic. (surface water 6 – 9; salt water 7.7 – 8.1)


Technology and Indicators used: (cont.)

  • Bioindicator: Organisms or components of organisms that are used to assess the health of a water system; an organism or community associated with particular environmental conditions a change to the number of organisms or the proportions of the community indicate a change in the environment.

  • Indicator: A chemical material or solution which can be used to show (usually by a change in color) the endpoint of a chemical reaction or chemical concentration. Examples: Litmus and Phenolphthalein


Technology and Indicators used: (cont.)

  • Macro-invertebrate: small, spineless creatures that are visible with the unaided eye; they include organisms such as Crustaceans, mollusks, worms, and insects.


Six Main Indicators Activity

Handout

Formative Assessment


LAB

  • 1. What would you do with this water

  • 2. pH and our Environment


ActivityCooperative Learning

The Fish Kill Mystery

With

Handout


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