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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

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

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
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


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

  • Nephelometric Turbidity Units (NTU):

  • 1 NTU – Ideal level

  • 5 NTU - High level


Chemical variables include
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
Environmental Stressors:

  • Urban runoff

  • Agricultural runoff

  • Industrial inputs

  • Over fishing – impacts populations


Results of environmental stressors
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


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

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
Technology and Indicators used: (cont.) provide treatments to improve conditions in Earth’s oceans and freshwater.

  • 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 cont1
Technology and Indicators used: (cont.) provide treatments to improve conditions in Earth’s oceans and freshwater.

  • 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
Six Main Indicators Activity provide treatments to improve conditions in Earth’s oceans and freshwater.

Handout

Formative Assessment


Water were does it come from and why do we need it
LAB provide treatments to improve conditions in Earth’s oceans and freshwater.

  • 1. What would you do with this water

  • 2. pH and our Environment


Activity cooperative learning
Activity provide treatments to improve conditions in Earth’s oceans and freshwater.Cooperative Learning

The Fish Kill Mystery

With

Handout