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Saturday 1st April 2017
Domestic Misconnections
Dun Laoghaire Rathdown Experience
• What are domestic misconnections?
• What problems do they cause for rivers and
streams?
• How have we fixed our misconnections and
improved our water quality?
The Way It Should Be
Foul wastewater going to the foul sewer and surface, uncontaminated
water going to the surface water sewer.
Types of Misconnection
• Separate and Combined Systems
• Surface Water into Foul Sewer
• Foul Wastewater into Surface Water
Sewer
How Do You Know If You’re
Misconnected?
Why Do We Want To Correct
Misconnections?
• Obvious reasons!
• EU Legislation – Water Framework Directive
• Magic number of 0.03mg/L Phosporus for ‘Good’
status
Improvements to Deansgrange Stream
• In May 2006 we decided to focus on the
Deansgrange Stream as it’s our most heavily
polluted stream
• 2 staff members went around and identified
misconnections
• Engaged with homeowner to fix the problem
Photos
The Results
• The results were encouraging in that
phosporus was reduced but we’re still not at
the magic number of 0.03mg/L
Location 1 Location 2 Location 3 Location 4
2005 0.2 0.31 0.1 0.1
2008 0.12 0.14 0.08 0.1
Phosporus (mg/l)
Improvements
• Misconnections removed
• In 2007/2008 a wetland was constructed in the
Kilbogget Park section of Deansgrange Stream,
downstream of Point 2, which helped remove even
more phosporus
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
Location 1 Location 2 Location 3 Location 4
2005
2008
2012
Typical section of Deansgrange Stream
Conclusions
• Finding and fixing misconnections is tedious work and can test the
patience of staff but it has lasting beneficial effects on water quality
• Building wetlands also has lasting beneficial effects
• If you check your own house and suspect you have a misconnection,
contact either Dublin City Council or DLR
Thank You!

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Compexometric titration/Chelatorphy titration/chelating titration
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Domestic Misconnections - Jayne Dobson DLRCC

  • 1. Saturday 1st April 2017 Domestic Misconnections Dun Laoghaire Rathdown Experience
  • 2. • What are domestic misconnections? • What problems do they cause for rivers and streams? • How have we fixed our misconnections and improved our water quality?
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  • 4. The Way It Should Be Foul wastewater going to the foul sewer and surface, uncontaminated water going to the surface water sewer.
  • 5. Types of Misconnection • Separate and Combined Systems • Surface Water into Foul Sewer • Foul Wastewater into Surface Water Sewer
  • 6. How Do You Know If You’re Misconnected?
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  • 12. Why Do We Want To Correct Misconnections? • Obvious reasons! • EU Legislation – Water Framework Directive • Magic number of 0.03mg/L Phosporus for ‘Good’ status
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  • 14. Improvements to Deansgrange Stream • In May 2006 we decided to focus on the Deansgrange Stream as it’s our most heavily polluted stream • 2 staff members went around and identified misconnections • Engaged with homeowner to fix the problem
  • 16. The Results • The results were encouraging in that phosporus was reduced but we’re still not at the magic number of 0.03mg/L Location 1 Location 2 Location 3 Location 4 2005 0.2 0.31 0.1 0.1 2008 0.12 0.14 0.08 0.1 Phosporus (mg/l)
  • 17. Improvements • Misconnections removed • In 2007/2008 a wetland was constructed in the Kilbogget Park section of Deansgrange Stream, downstream of Point 2, which helped remove even more phosporus
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  • 21. 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 Location 1 Location 2 Location 3 Location 4 2005 2008 2012
  • 22. Typical section of Deansgrange Stream
  • 23. Conclusions • Finding and fixing misconnections is tedious work and can test the patience of staff but it has lasting beneficial effects on water quality • Building wetlands also has lasting beneficial effects • If you check your own house and suspect you have a misconnection, contact either Dublin City Council or DLR