Keep it Clean Preventing Stormwater Pollution Our focus - What can - - PowerPoint PPT Presentation

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Keep it Clean Preventing Stormwater Pollution

Our focus - What can the urban community do to help our waterways?

Engineering Services / Pollution Control Group 30th October 2009

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What is the main Problem?

Algae Blooms caused by poor water quality.

• Too much Nitrogen
• Too much Phosphorus.
• Not enough Oxygen

This is mainly from rotting waste that uses oxygen from the water and produces Nitrogen & Phosphorus

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Bush

Where does the rain water go?

City

15% into soil 30% back to air 55% stormwater

50% into soil

40% back to air 10% to streams

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Lake Rotorua storm water catchment Lake Rotorua storm water catchment

• Council has Reticulated approx. 320 km of storm water drainage;

Council has Reticulated approx. 320 km of storm water drainage;

• this drainage system has approx 5,357 inlets and outlets, the

this drainage system has approx 5,357 inlets and outlets, the

• utlets discharge into streams and the Lake.
• utlets discharge into streams and the Lake.
• Rain water washes contaminants off the land (pollution) into th

Rain water washes contaminants off the land (pollution) into this is drainage system so; drainage system so;

• EBOP has issued approx. 87 resource consents to the Council to

EBOP has issued approx. 87 resource consents to the Council to control the quality of the drain's discharges . control the quality of the drain's discharges .

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How does it get there? Example of RDC stormwater network

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What urban causes contribute to this?

• Dirty Stormwater

– Sediment discharge – Washing waste water – Dumping rubbish into drains – Natural vegetation discharged to waterways

SEE THE FOLLOWING EXAMPLES

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Polluted water comes from many forms of everyday activity

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Cement waste is Toxic to fish life in streams and lakes

Exposed aggregate Washed off to RDC Cesspit & Utuhina Stream

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Paint wash waste into stormwater came out at Springfield Golf course

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Vehicle Washing

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Dumping rubbish into drains

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Check where you wash out your paint brushes. Waterbased paint waste can go to the sewer. Check with suppliers if paint waste can go back to them

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Water blasting cleaning. Make sure the waste water is going onto a grass area

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Sewage Overflows are another problem

These mainly occur in the urban area. Main causes:

• Fat from kitchen

wastes

• Rubbish put down

drains & manholes

Call RDC ASAP

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Motor Vehicle accidents

Diesel spill on road

Collected waste

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Other contributing Factors

Rotting vegetation

Sediment Layer & rotting vegetation.

• In the last 120yrs

– Lake Rotorua has developed a layer of 700-800mm – Lake Rotoiti has a layer of 100mm.

Measured from the Tarawera eruption ash layer.

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What do I do when I see pollution going What do I do when I see pollution going into the drain? into the drain?

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Complaint Calls are Very Important

WHO DO YOU CALL? Rotorua District Council Ph 348 4199 – 24 hours

• YOUR JOB

Name, address, ph No. spill details, location,

• Investigation and sampling are an

important part of recovering clean-up costs and infringement fines.

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Pollution Control on-call service group.

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Pollution Control Team Pollution Control Team-

• Regulatory Compliance

Regulatory Compliance

• Educating

Educating

• Encouraging compliance

Encouraging compliance

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ANY QUESTIONS?