Henry Hagg Lake

Water Quality Report

Location

The testing site- Boat dock A

A close up look at site

Hypothesis

• Water quality would decrease over the summer –temp. would raise, nitrate increase, oxygen decrease

• Measurements– PH– Temperature– Nitrates– Dissolved oxygen

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

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

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

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

DataDate Dissolved

OxygenPH Air Temp

/Water TempNitrates

7-19 88% 6.5 58/70 0

7-27 44% 6.5 62/72 0

8-9 44% 6.5 60/70 0

8-18 46% 6.5 64/72 0

8-26 44% 6.5 62/70 0

Conclusion

16-Jul 21-Jul 26-Jul 31-Jul 5-Aug 10-Aug 15-Aug 20-Aug 25-Aug 30-Aug0

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PHWater Temp.Air Temp.Disolved Oxygen