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Science in an old growth Redwood Forest at Grizzly Creek State Park Slide 2 Healthy Streams: What makes a healthy stream? Slide 3 Scientists observe, measure, record, analyze, and make conclusions Slide 4 What is turbidity? Why is turbidity important for a healthy stream? Slide 5 Dr. William Trush, River Ecologist McBain and Trush, Arcata CA If the turbidity in a stream reaches 20 NTUs for 20 straight days, the forming salmonid will not be able to see its food, will not grow to its full length, and will be unlikely to survive into adulthood. Slide 6 Using the Slyter Stick to take a sample Slide 7 Turbidity Data all 5 Schools Slide 8 Data Report Covers a Slice of Time Nov.22, 2014 Dec.6, 2014 Slide 9 Water Temperature Why is water temperature important to a healthy stream? Slide 10 Temperature can be measured in two scales. CELSIUS FAHRENHEIT 10 degrees Celsius is the same as 50 degrees Fahrenheit Slide 11 What is the most prevalent fish in the Van Duzen and Eel Rivers? Slide 12 Salmon like it colder! Coho salmon like it colder than chinook Chinook like it 55 degrees to 67 degrees Fahrenheit (12-19 degrees Celsius) Coho like it 50 degrees to 62 degrees. (10-16 degrees Celsius) Chinook eggs hatch, grow, and move to the estuary in a few months. Coho eggs hatch and stay in the cold creek for many months before moving to the estuary. Slide 13 Data Temperature 5 School and 3 Locations Slide 14 Slide 15 Grizzly Creek Dec.6 th, 2014 Slide 16 What is ph Why is ph important to a healthy stream? Slide 17 Main Stem at Grizzly Creek Slide 18 pH rises and falls during the course of a hydrologic year The North Coast Water Quality Control Board objectives for pH in the Van Duzen River are 6.5 to 8.5. Slide 19 pH Eel River, Van Duzen River, Grizzly Creek Slide 20 Slide 21 Fruits and vegetables can raise your bodies pH. The pH scale ranges from 0 to 14; pure water has a neutral pH of 7. Acids range from 0 to 7, and bases range from 7 to 14 on the scale. The website Alkalize for Health reports that human blood maintains a steady pH of 7.4, making it slightly alkaline. Slide 22 Science at Grizzly Creek Park