warm up the chesapeake bay watershed is made up of which six states? in our local watershed, water...
TRANSCRIPT
Warm UpThe Chesapeake Bay Watershed is made up of which six states?
In our local watershed, water from South Riding flows into ________ ________ which then flows into the __________ __________ and finally down to the _______________ __________ .
New York Virgini
aWest Virginia
Pennsylvania
MarylandDelawar
e
Bull Run
Potomac River Chesapea
keBay
Salinity:
Vocabulary to KNOW
Pieces of rock & soil carried along a stream or river
The amount of dissolved salt in the water
The cloudiness or haziness of a stream due to large amounts of floating or carried sediment
Sediment:
Turbidity
:
Floating Egg Experiment
2 cups of cold water, a large glass jar, 4 tbsp. kosher salt, a spoon and a raw egg.
Pour 1 cup of the cold water into the large jar. Dissolve the kosher salt in the water by stirring it with a spoon
Pour the remaining cup of cold water gently into the glass jar and avoid disturbing the salt water as much as possible
Slowly drop the raw egg into the water. The raw egg will sink through the plain water but will stop and float where the salt water begins.
Salt water is more dense than plain water, so it makes the egg float.
Salinity Demo
The amount of dissolved salt in the water
What is salinity?
Why is salinity important? It tells us how much fresh water has
mixed with salt water It impacts the density of the water
which determines how water will move It impacts various chemical processes It affects the biotic factors in an
ecosystem
Sediment - When streams flow, they break down rocks and soil which are then carried along downstream.
Runoff from nearby fields can also carry sediment into streams and rivers.
Pieces of rock and soil carried along a stream or river
Is anyone checking this water to see how dirty it really is?
Hydrographer s carry numerous glass bottles to obtain samples of the river. The brown water here indicates the presence of a lot of fine dirt particles (sediment), making the turbidity of this water is very high.
Turbidity can also be caused by bacteria and algae!
What does turbidity tell us about the river?
How cloudy or clear the water is
Turbidity
Would turbidity affect animals or plants in the river?
What makes the water turbid?
Sediment, Bacteria and Algae!
Measuring the turbidity of a water
source is one of several tests that help
determine water quality
Water quality tells us whether the water we
drink is CLEAN or POLLUTED!
Why should I care about water quality?
Polluted water can make you sick or
even kill you!
How can I find out if these are clean?
TEST THEM!
Water Quality Scientists look at
several factors to see if the water is healthy
• Dissolved Oxygen (DO)• Nitrate• pH• Phosphate• Temperature• Turbidity
Water Quality Testing LabMaterials
– Safety Goggles – Gloves – Water Sources
– LaMotte Water Monitoring Kit
Procedures: Follow the directions posted at each station. Use the correct equipment and handle all materials with caution. Once each test is complete, you may dispose of your chemical waste material down the sink with the faucet running.
Water Quality Testing LabCheck your results against the chart
Record your results in the table
Water Quality Testing Lab
You should have THREE sets of data!
Type of Pollutant Dissolved Oxygen (DO)
ppm
Nitrate ppm
pH
Phosphate ppm
Temperature °C
Turbidity JTU
Water Quality Testing Lab
Check out this video of students checking the water quality of the Potomac River!
Water Quality Testing Lab
Answer the Analysis Questions using complete
sentences!
Turn in lab when complete!
Websites and Videos from the Presentation
1. http://www.youtube.com/watch?v=tuYB8nMFxQA(Water and You – The Water Treatment Process)
2. https://www.youtube.com/watch?v=VAevsIHDnhQ(Eggs and Salt Water – Float an egg in the middle of salt water)
3. https://www.youtube.com/watch?v=f7yGbsMli3s(Turbidity)
4. http://www.spark101.org/video/what-does-water-testing-tell-us-about-water-qualit/(What Does Water Test Tell Us about Water Quality?)
5. https://www.youtube.com/watch?v=kJ6fZrUyWj4(Water Quality: Turbidity)
6. https://www.youtube.com/watch?v=5jJWMmIYMlw(Measure Water Turbidity)
EXTRA VIDEO!
EXTRA VIDEO!