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 1
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 2
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Where does the rain water go? 50% into soil 40% back to air 10% to streams 15% into soil 30% back to air 55% stormwater 4 Bush City
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 outlets discharge into streams and the Lake. outlets discharge into streams and the Lake. • Rain water washes contaminants off the land (pollution) into this is • Rain water washes contaminants off the land (pollution) into th 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 . • 5
How does it get there? Example of RDC stormwater network 6
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 7
Polluted water comes from many forms of everyday activity 8
Cement waste is Toxic to fish life in streams and lakes Exposed aggregate Washed off to RDC Cesspit & Utuhina Stream 9
Paint wash waste into stormwater came out at Springfield Golf course 10
11 Vehicle Washing
12 Dumping rubbish into drains
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 13
Water blasting cleaning . Make sure the waste water is going onto a grass area 14
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 15
Motor Vehicle accidents Collected waste Diesel spill on road 16
Other contributing Factors 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. Rotting vegetation 17
What do I do when I see pollution going What do I do when I see pollution going into the drain? into the drain? 18
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. 19
20 Pollution Control on-call service group.
Pollution Control Team- -Regulatory Compliance Regulatory Compliance Pollution Control Team • Educating Educating • • Encouraging compliance Encouraging compliance • 21
22 ANY QUESTIONS?
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