Intervento di Anders Lynggaard-Jensen al convegno "Smart Water nella città del Futuro" - Milano, 22/10/2015

1. Anders Lynggaard-Jensen, DHI
Oct. 22nd 2015
Palazzo Turati, Milano
Real time sewage and storm
water management in urban
areas: Aarhus case study

2. The City of Aarhus
• Aarhus: The second largest city in Denmark
• 300.000 inhabitants - and growing fast!
• Located on the eastern coast of Jutland
• Educational center with large university and
many knowledge-based companies
• No heavy industry
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

3. City Development – Project Drivers
• Green/Blue City
• Water Framework Directive
• Bathing Water Directive
• Adaptation to Climate Change
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

4. Situation in 2007 at start of project
• Lake Brabrand, River Aarhus and
Aarhus Harbor are affected by:
• 75 combined sewer overflows
(CSO)
• 58 storm water drains
• 50% of the flow in the river is
from WWTPs
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

5. Integrated modelling for design
and Real Time Control/Warning
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano
• Rural catchment model (MIKE SHE) driven by rainfall. Calculating the
run-off from the rural area as an input for Lake and River model.
• Sewer catchments model (MIKE URBAN) driven by rainfall and dry
weather flows. Calculating flows, run-off, CSO’s and E.coli transport as
input to the Lake and River model.
• Lake and River model (MIKE11) calculating flowpattern and
E.coli/Enterococci transport as input to the Harbor model.
• Harbor model (MIKE3) calculating flow pattern and E.coli/Enterococci
transport using a marine model as the “downstream” boundary.

6. Challenges and Solutions
• Challenges - infrastructure
• Sufficient basin volume (cost/space limitations)
• Sufficient water quality (hydraulic capacity and
disinfection at WWTP)
• Climate Change (rain intensity, sea level)
• Challenges – monitoring/control
• Prediction of distributed rain events
• Real time integrated modelling/control
• Sufficient controlability (weirs, pumps,…)
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano
• Infrastructure
• New retention basins (approx. 55.000 m3)
• Disinfection at WWTPs
• Increased hydraulic capacity at WWTPs
• Monitoring/Control
• Integrated real time modelling/control (sewer
system/WWTP)
• Early Warning system for water quality
• Costs
• 50 mill. Euro with Warning system
• 67 mill. Euro without Warning system

7. Catchments, Storage tanks and WWTPs
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

8. Integrated Real Time Control setup
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

9. Layered System Structure/Safe Fallback
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

10. Layer 1: Local Control
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

11. Layer 2: Global Control
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

12. Real Time Control – Software Sensors
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano
Red: Upstream level measurement
Green: Downstream level measurement
Light blue: Flow measurement
Dark blue: Flow calculation

13. Layer 3: Global Predictive Control
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

14. Distributed Rainfall Monitoring
Local Area Weather Radar: LAWR
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

15. Early Warning System
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

16. One warning system – Integrating data
from multiple organizations and authorities
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano
Run-off operated by
Environmental Section
Aarhus Municipality
RTC operated by
Aarhus Water
Waterforecast
operated by DHI

17. Early Warning System:
Web-site and smartphone/tablet App
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano

18. Conclusions and lessons learnt
• Operation staff also involved in design and
implementation!
• Suitable number of sensors and control
handles!
• Validation and calibration of data during
design and operation!
• Systems on line with all components!
• Systematic fall back strategy in several
layers!
• Simulation of a high number of scenarios in
the design phase!
• Planning and operation divided in similar but
separate systems!
• Clear organizational setup!
• Events with poor water quality will occur!
• What are your politicians expecting?
• Be aware of communications and media relations!
• Warning of poor water quality
Smart Water in the city of the future
22 ottobre 2015, Palazzo Turati Milano