| 1. What is the normal pH range of a stream? Why is it not always a good indicator of stream health? 2. What does alkalinity measure? Why is it a better measure than pH for stream health? 3. What is “hard” water? Describe the advantages of disadvantages of calcium carbonate in water. 4. What is the normal amount of nitrates in water? What is eutrophication & what causes it? 5. What is the normal amount of phosphates in water? Why is phosphorus considered a “limiting factor?” What are some common sources of phosphorus? 6. What are the 2 main sources of dissolved oxygen in streams? What is the normal amount of DO for a stream? What causes low DO levels? 7. What is BOD? What is a normal BOD for a stream? 8. Where do coliform bacteria come from? What is the normal level for a stream? 9. What 2 factors determine the density of water? 10. What is the “EPT Index” of a stream? 11. What can changes in temperature mean in a stream? 12. What factors can tell you that a waterway has been dredged? 13. What is “stream order”? 14. What is turbidity? How is it measured in a waterway? 15. Do you think Bear Creek is polluted? |