1. Henry Hagg Lake Water Quality Report

2. Location

3. The testing site- Boat dock A

4. A close up look at site

5. Hypothesis Water quality would decrease over the summer –temp. would raise, nitrate increase, oxygen decrease Measurements – PH – Temperature – Nitrates – Dissolved oxygen

6. Temperature Temperature is very important to water quality – Temp Oxygen – It effects the rate of photosynthesis by plants and the sensitivity of organisms to toxic wastes and disease – The sun raises the temperature of water as well as thermal pollution from industry

7. Dissolved Oxygen Dissolved oxygen is important to the health of aquatic ecosystems – A decrease can endanger species – High levels of bacteria from sewage or rotting plants can cause % of saturation to decrease – A raise in water temperature can also decrease saturation

8. Nitrate Nitrate is a nutrient needed by all aquatic plants and animals – Decomposition of dead plants and animals and excretions of living animals contribute to nitrate levels – Sewage is the main source of excess nitrate as well as agricultural runoff – Excess levels of nitrate can increase plant growth and therefore decrease % oxygen saturation

9. pH pH can be affected by – Industrial waste – Agricultural runoff – Drainage from poorly operated mining operations – Many animals can be affected by even small changes in pH levels

10. Data DateDissolved Oxygen PHAir Temp /Water Temp Nitrates 7-1988%6.558/700 7-2744%6.562/720 8-944%6.560/700 8-1846%6.564/720 8-2644%6.562/700

11. Conclusion