a systematic, multi-criteria decision support framework for sustainable drainage design jo-fai chow,...
TRANSCRIPT
A Systematic, Multi-Criteria Decision Support Framework
for Sustainable Drainage Design
Jo-fai Chow, Dragan Savić,David Fortune,Zoran Kapelan,Netsanet Mebrate
You can download this presentation from
http://tinyurl.com/chow-ccwi2013
photo's courtesy of www.pptbackgrounds.net
About this Presentation
• Background•Green Values of Drainage Systems• Evaluation Framework•Maximising Multiple Benefits• Conclusions
02 of 15slides
Background
• Trends in Drainage Industry• Moving towards a sustainable
approach
• Challenge• Lack of commonly agreed
standard for sustainable drainage design
• Objective• To develop a new decision
support system for sustainable drainage design
• Collaboration• EPSRC, STREAM IDC,
University of Exeter and XP Solutions
03 of 15slides
Sustainable & BalancedApproach
Traditional & BiasedApproach
Water Quantity Water Quality
Other Benefits
Water Quantity
Water Quality
Why Sustainable Drainage Design? Green Values of Drainage Systems
• Water Quantity• Runoff reduction, flood risk mgt., re-
use
• Water Quality• On-site treatment
• Environmental Impact• Cleaner water & air, amenity,
biodiversity, recreation, community
• Energy Saving• Less cooling/heating, reduced carbon
footprint
• Green Image of Business
04 of 15slides
photo's courtesy of XP Solutions photo's courtesy of ReneCreate
photo's courtesy of EMPowerHouse
photo's courtesy of
roanokeoutside.com
photo's courtesy of nzconservation.wordpress.c
om
photo's courtesy of Arup photo's courtesy of Polypipe
photo's courtesy of gregwalcher.wordpress.co
m
photo's courtesy of china.org.cn
photo's courtesy of Deloitte
Quantifying Green Values:From Good Feelings to Real Numbers
05 of 15slides
Calculations based onprevious research projectsand case studies.
For more information:
1.Conference Paper2.This presentation online
(tinyurl.com/greenvalues)
Using physical attributes & location of infrastructures to calculate costs.Four main categories of performance measures.Key performance indicators (KPIs) calculated for each infrastructure.Calculate monetary measures of benefits based on KPIs.Consider costs and benefits over the design life of systems.
Putting the Numbers Together: A Systematic Evaluation Framework
06 of 15slides
Information from a typical drainage model.
Using the Framework – Inputs:Components in a Drainage Design Model
07 of 15slides
BioretentionBioretention
PermeablePaving
Wetland
Swale
Swale
photo's courtesy of XP Solutions
Using the Framework – Outputs:Operational and Capital Expenditure
08 of 15slides
Swales are relatively cheap to build and maintain.
Question: can the costs be justified?
Permeable paving costs a lot more to build and maintain.
Using the Framework – Outputs:Key Performance Measures
09 of 15slides
Permeable paving can effectively reduce runoff via infiltration
… but it does not add amenity value to the community.
At a fraction of the cost, swales can provide moderate runoff reduction
and increase the amenity value as a result of the green surface areas.
Goal: moving away from subjective opinions to evidence-based comparison.
Comparing Different Approaches: Green (Sustainable) vs. Grey (Traditional)
10 of 15slides
BioretentionPermeablePaving
BioretentionWetland
Swale
Swalephoto's courtesy of allbiz
Storage Tank
Question: is it worth considering the green approach after all?What do you think?
Let’s consider the sustainable design example discussed in previous slides again.
What if we replace the swales and wetland with storage tanks?
Comparing Different Approaches: Green (Sustainable) vs. Grey (Traditional)
11 of 15slides
Green approach can provide multiple benefits in addition to water management.
Green approach costs about the same to operate, much less to build yet a lot more for the land occupied when compared to grey approach.
In this case, the framework suggests similar long-term costs for both approaches.
(Let me repeat the key message again…)Goal: moving away from subjective opinions to evidence-based comparison.
Comparing Multiple Drainage Design Options
12 of 15slides
Different design options.
Comparing multiple benefits with parallel coordinates.
Comparing cost-benefits for different options.
Next Step: Beyond Evaluation - Maximising Multiple Benefits
13 of 15slides
•Design Consideration:• Legislative Requirements• Location• Sizing• Type & Order
• Identifying Trade-offs:• Multiple benefits• Multi-objective
optimisation
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photo's courtesy of University of Sheffield
photo's courtesy of XP Solutions
photo's courtesy of BME Imaging
photo's courtesy of bfrss.org.uk
Conclusions 14 of 15slides
• Challenges: lack of commonly agreed standard for sustainable drainage design.
• Aim: to develop a new decision support system.
• Why green infrastructures? Because they can offer multiple benefits in addition to water management.
• Quantifying green values with KPIs and monetary measures.
• A systematic evaluation framework - evidence-based comparison, a better tool for optioneering.
• Integration with multi-objective optimisation – encourage the consideration of multiple benefits.
• Research outputs for industrial sponsor: new features in their drainage design software suite.
• “Essentially, all models are wrong, but some are useful.” – Professor George E.P. Box
photo's courtesy of Amazon
Thank you for your attention
15 of 15slides
Any questions?Many thanks to Prof. Dragan Savić who kindly agreed to present this for me!
[email protected]://tinyurl.com/chow-ccwi2013
http://tinyurl.com/greenvalueshttp://tinyurl.com/xpdrainage