Grey and Green Infrastructure Benefit Cost, Return on Investment An...

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Municipal Stormwater Discussion Group
Cost-Benefit /
Return on Investment Analysis for
Grey and Green Infrastructure
to Su...

OUTLINE
1) Regulations & Policies on Cost Efficient Infrastructure
2) Examples of Benefit/Cost : Canada, Ontario
3) Disast...

Provincial Policy Statement (2014):
“Infrastructure … shall be provided in a coordinated, efficient and cost-effective
man...

4
• Ontario’s LTIP released November 2017
• Themes mentioned:
▫ Proactive asset management integrates climate change mitig...

Why Calculate ROI For Flood Mitigation?
• Consistent with principles for flood reduction
(Watt, 1984)
“It is therefore rea...

6
First Example in Canada?
• Need for comprehensive cost-
benefit analysis to guide flood
mitigation planning and policy
(...

7
0.77
0.06
• Benefit-Cost Ratios
• Range:
▫ 0.06 to 0.77
• Establish priorities
• One size certainly
does not fit all!
St...

Why Calculate ROI For Flood Mitigation? (OSPE)
8
• OSPE comments on Long Term Infrastructure Plan “recommends that the
Gov...

Why Calculate ROI For Flood Mitigation? (OSPE)
9
– iii. Recognize that green
infrastructure must be viewed
through the sam...

Why Calculate ROI For Flood Mitigation?
10
• Disaster Mitigation Adaptation Fund Eligibility
“The ROI is measured by the p...

To Not Be Reckless With Taxpayers Dollars
11

Don Mills Channel Flood Control ROI
12
• Recently completed Class EA included evaluated grey (culverts and
central storage...

Don Mills Channel Flood Control ROI
13
• Flood damage estimates at various return periods used to calculate
reduction in a...

14https://goo.gl/AosUjy
• Solutions compared in
terms of their
economic efficiency,
considering ‘payback
period’ to recove...

Don Mills Channel Flood Control ROI
15
• Application for DMAF funding must show benefit/cost of > 2
• Benefits
= 100 year ...

Ontario-wide Evaluation of Green & Grey Infr. Benefit / Cost
• Approach:
– Step 1 – Average Annual Losses (IBC, CatIQ Data...

Step 1 – Average Annual Losses
• IBC has identified yearly insured losses in
Ontario for catastrophic flood/storm events.
...

Step 2 - Cumulative Damages Prevented by Flood
Mitigation Efforts (Benefits)
18
• Cumulative damages prevented over the se...

Step 3 - Flood Risk Mitigation Lifecycle Costs Green Infrastructure
19
• Unit
capital,
O&M
costs:
Phil. Final
Report
and
O...

Step 3 - Flood Risk Mitigation Lifecycle Costs Green Infrastructure
20
• Ontario
lifecycle:
Phil. Final
Report and
Ontario...

Step 3 - Flood Risk Mitigation Lifecycle Costs
Grey Infrastructure
21
• Markham's flood reduction program costs:
i) $234 m...

Step 3 - Flood Risk Mitigation Lifecycle Costs
Grey Infrastructure
iii) Storm and wastewater system upgrade costs equate t...

Step 4 – “ROI” Benefit/Cost Ratio
Green Infrastructure
23
• GI, LID benefit / cost ratios in Ontario can be evaluated cons...

Step 4 – ‘ROI’ Benefit/Cost Ratio
Grey Infrastructure
24
• Grey infrastructure benefit/cost ratios in Markham can be evalu...

Step 4 – ‘ROI’ Benefit/Cost Ratio
Grey Infrastructure
25
iii) benefit / cost = 526 / 260 = 2.02, say 2.0
The benefit/cost ...

Step 4 – “ROI” Benefit/Cost Ratio - Markham
26
Scenario - Benefits
Grey
Benefit
Grey
Cost
Grey
B/C
Green
Benefit
Green
Cos...

0.1
1
10
100
1000
10000
Policies /
Standards
Downspout
Disconnection
(I&I)
Subsidize
Backwater
Valves Etc.
Sanitary Sewer
...

Conclusions
• Benefit/cost ratios can be used to evaluate the economic efficiency of
infrastructure investments and whethe...

Conclusions
• In a pair-wise comparison of grey and green solutions in Markham shows:
– Grey is 17 to 67 times more cost e...

Thank You
Questions ?
More Rob :
Blog: www.CityFloodMap.com
Podcast: Open During Construction on iTunes
Twitter: @RobertMu...

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