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Lab: Water Quality Lab: Water Quality in the Pajaro Valleyin the Pajaro Valley
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What is a What is a watershedwatershed
??
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What do watersheds What do watersheds do for us and all the do for us and all the living things around living things around
them? them?
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EutrophicationEutrophication1. Fertilizer containing
nitrogen (N) & phosphorous (P) runs off into water
2. Algae grow & reproduce fast
3. Algae die4. Bacteria break down
dead algae5. Bacteria use up all
oxygen in water6. All organisms die
without oxygenPinto Lake (Sept 2010 – LA
Times)
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Water Quality Tests: Water Quality Tests: pH pH
Stomach acid Vinegar Lemon juice
Pure water
Baking soda Soap Bleach
Acidic
Neutral
Basic
1
7
14
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Water Quality Tests: Water Quality Tests:
Nitrate (Nitrate (NO3))
Contained in fertilizer
OO
O
N
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Water Quality Tests: Water Quality Tests: Phosphate (POPhosphate (PO44))
Contained in • Fertilizer• Soap/detergent
O
O
OO P
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Water Quality Tests: Water Quality Tests: Dissolved Oxygen (ODissolved Oxygen (O22))
All animals breathe oxygen!
Reduced by eutrophicationO
O
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Water Quality Tests: Water Quality Tests: TurbidityTurbidity
Turbidity =
cloudinessof the waterfrom dirt &
algae
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pHpH
NitrateNitrate
PhosphatePhosphate
Dissolved OxygenDissolved Oxygen
TurbidityTurbidity
Choose Choose TWOTWO tests to tests to dodo
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Tap Water
Pinto Lake
Pacific Ocean
Pajaro River
Watsonville Slough
5 Sites5 Sites