Water Quality • How do we know if the water is “good?” • Dissolved oxygen • Pathogens • Temperature • pH • Turbidity • Suspended sediment • nitrates • http://ga.water.usgs.gov/edu/characteristics.html
Where does pollution come from? • There are two main categories of water pollution: • Point source • Nonpoint-source
Point source pollution • Comes from one specific source: • Leaking sewer pipe • Leaking tanker • Outfall pipe from a factory • This type of pollution can be identified, monitored and controlled.
Point source pollution http://www.bing.com/images/search?q=bp+oil+spill+pictures&qs=IM&sk=IM1&pq=bp+oil+spill+&sp=2&sc=8-13&form=QBIR#x0y37
Nonpoint-source pollution • Comes from many vague sources: • lawns • fields • roadways • This type of pollution is difficult to trace, difficult to monitor and difficult to control. • Education is the best remedy!
http://www.txlawncare.com/wp-content/gallery/landscape/riding-spreader-ferlizing-lawn.jpghttp://www.txlawncare.com/wp-content/gallery/landscape/riding-spreader-ferlizing-lawn.jpg http://www.bing.com/images/search?q=nonpoint+source+pollution+examples&view=detail&id=A087CA45F3EE0D8EB31D011B4651652D96A1DDD0&first=0&FORM=IDFRIR http://www.bing.com/images/search?q=litter+images&view=detail&id=06A70A7E2B26B95CA01BF41C312F4040898BADD2&first=0&FORM=IDFRIR
Cultural eutrophication From Miller’s Living in the Environment
Wastewater treatment From Miller’s Living in the Environment
Primary treatment • Large screen to catch solids such as plastics, bottle caps, paper. • Large tank where small particles can sink & get filtered out. • Oil floats to surface & is skimmed off.
Secondary treatment • Water flows to aeration tank where oxygen & bacteria are mixed. • Bacteria feeds on the waste. • Water flows to another tank. • Water is disinfected with chlorine, UV or ozone. • Water is released to stream or river.
NC Water Use • http://www.ncagwater.org/documents/NC_Agricultural_Water_Strategic_Plan_Exec_Summary.pdf
NC Law for water conservation • http://www.ncwater.org/Reports_and_Publications/hb1215/HB1215_Sec5_Report.pdf http://www.bing.com/images/search?q=Water+Conservation+Ideas&view=detail&id=924A5F6C23BE13E3FA7C4DAEC1525681838B5121&first=0
What can you do to reduce your water consumption? • With your team, generate a list of ways that you can reduce your water consumption. Every drop counts! • Here are some ideas…let’s compare our lists: • http://wateruseitwisely.com/100-ways-to-conserve/index.php
Homework • Read pages 326 - 331
Output • Select 3 ways to reduce your water use. • Write them in your notebook. • Share these ideas with your family tonight. • Make a mental note about how they respond to your ‘water conservation’ lesson.