sustainability: water pollution in new zealand
TRANSCRIPT
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Do Now (Page 8)Global Guide: Samantha Hill
Country: New Zealand
Answer the Question:List 3 causes of Water Pollution.
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Water Pollution in New Zealand
Samantha HillColumbia University
Sustainability Around the World
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Where in the world is New Zealand?
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True or False?
New Zealand is part of Australia
FALSE
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True or False?
New Zealand has three ‘official’ languages
TRUE
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True or False?
90 % of New Zealanders live within 25 miles of the coast
TRUE
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True or False?
New Zealanders are often called “Kiwis”after the fruit
FALSE
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Auckland
Wellington
Christchurch
New Plymouth
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30 million sheep
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6.6 million dairy cattle
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6.6 million dairy cattle
GOOD NEWS for the dairy industry….
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Particles Microbes Nutrients
NH3
PO4
NO3
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Particles Microbes Nutrients
NH3
PO4
NO3
Particles
• Murky water—sunlight can’t get through
• Muddy layer on the stony riverbed
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Particles Microbes Nutrients
NH3
PO4
NO3
• Cause disease in animals
• Cause disease in people—E. coli, Campylobacter….
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Particles Microbes Nutrients
NH3
PO4
NO3
Particles
• Chemicals that promote growth…
• Cause algae to grow much faster
• Algae deoxygenate the water
• Some algae are toxic
More algae = less oxygen
O2
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Assimilative Capacity
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Assimilative CapacityThe ability of a water body to process a substance without
becoming degraded.
• Keep pollution levels below assimilative capacity
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Assign every group member to a task. Two people doing the same task is ok.
Try to be specific—how does the water in the cup compare to the water in the bottle?Color? Clarity? How fast does it flow?
What did you do for this cup?
How do we reduce water pollution?
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Riparian Planting
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Riparian PlantingPlanting along the margins of a waterway (“riparian margins”)
to reduce erosion and pollution.
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• Farming is a major source of water pollution
• Particles, microbes and nutrients
• Excess nutrients cause algal growth and deoxygenation
• Riparian planting
• Stock exclusion (fences)
• Pollution needs to be kept below the assimilative capacity of the waterway
• These practices are now mandatory for dairy farmers under the Sustainable Dairying: Water Accord (2012)
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Any questions?
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Kia ora!
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Closing
Answer the two questions on Page 9