1. WATER USAGE HOW DO HUMANS USE WATER?

2. Main Uses 1. Power Plants – Coal burning – Nuclear power 2. Agriculture – Irrigation: Watering crops

3. Where do we get water from? Reservoir: Source of water; artificial lake Aquifer: – Source of water underground – Water brought to surface using a well

4. Permeable: – Liquids and gases can pass through Impermeable: – Won’t let liquids or gases pass through

5. Water Quality Review

6. Types of Pollution Point Source: – You know EXACTLY where it’s coming from Ex. pipes leaking waste into ocean Ex. Factory leak into water Nonpoint Source: – You don’t know exact source; RUNOFF! Ex. Rainwater carrying waste to a stream

7. Turbidity How dirty/cloudy water appears

8. Dissolved Oxygen Oxygen in water for animals and plants A low level of oxygen is bad – Could be caused by eutrophication pH Good pH for water is 6.5-8.5 Too acidic can be harmful

9. Nitrates and Phosphates Nutrients and chemicals from agriculture (fertilizer) Too much can cause eutrophication!

10. Eutrophication Too many nutrients get into pond, cause algae to grow out of control Plants and animals die Bacteria decompose dead organisms, use up dissolved oxygen Eventually pond turns into a meadow

12. Bioindicator Can only live in certain water conditions If able to survive in certain water, that tells you the water is healthy Ex. Caddisfly larvae are sensitive to pollution, so if they are thriving, that tells you the water is healthy.

13. Water Treatment Plant Cleans water for human use