Which WSUD assets are most financially - WordPress.com
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Which WSUD assets are most financially sustainable? Jarrod Gaut
Transcript of Which WSUD assets are most financially - WordPress.com
Which WSUD assets are
most financially
sustainable?
Jarrod Gaut
research, $ vs performance
financial sustainability“are all assets made equal?”
urbanisation trends
WSUD in Geelong
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survey poll:
how many
coffees have
you had today?
4https://www.polleverywhere.com/multiple_choice_polls/DaepgoW6mvz1cid
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survey poll:
who is listening?
6https://www.polleverywhere.com/clickable_images/kkio3665vcuqx3X
survey poll:
what percentage of Australia’s
population lives in urban areas?
8https://www.polleverywhere.com/free_text_polls/is150EwaoYofHKv
urb
an
isati
on
tre
nd
s
89%
urb
an
isati
on
tre
nd
s
3b
(1b)
7.6b
(4.1b)
“by 2051 the total area of
impervious surfaces in
Melbourne will increase by
around 43%”
DELWP, 2018
2005
2012
2017
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urb
an
isati
on
tre
nd
s
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in rural environments
85% of precipitation is
evaporated or
transpired, while in an
urban environment this
figure is reduced to
around 15%
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Flooding
Quality
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Flooding
Quality
The runoff from urban
areas has been identified
as the largest non-point
source of pollutants within
stormwater
Source:EPA
pollutants in stormwater
Source: NSW Government
identified as the highest
priority threat to:
environmental assets
social cultural and
economic benefit
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WSUD
Cl 56 VPPBPEMG
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WSU
D in
Geelo
ng
wetl
an
ds
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bio
rete
nti
on
WSU
D in
Geelo
ng
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WSU
D in
Geelo
ng
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+ 50 GPTs
+ 200
streetscape
assets
WSU
D in
Geelo
ng
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WSUD asset growth in CoGGW
SU
D in
Geelo
ng
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WSUD asset growth in CoGGW
SU
D in
Geelo
ng
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WSU
D in
Geelo
ng
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WSU
D in
Geelo
ng
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So
luti
on
s
wetlands and
sedimentation basins
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WSU
D in
Geelo
ng
raingardens and
bioretention basins
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WSU
D in
Geelo
ng
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WSU
D in
Geelo
ng are the assets that are being installed, the most
sustainable for the ultimate asset managers?
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“RESEARCH”
“concerns over cost and
maintenance of WSUD
systems are the most
vocalised barriers to
its implementation”
Building Capacity with regional
and rural Councils.
Clearwater, 2012
rese
arc
h
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studies show the economic, environmental and
social benefits of these spaces
also that the increase in property prices can
offset the capital and maintenance costs of
these assets
rese
arc
h
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Comparing Financial Efficiency
rese
arc
h
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Comparing Financial Efficiency
rese
arc
h
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Comparing Financial Efficiency
Wetlands
Bioretention Basins
How about the size
of the asset?
$ per kg?
rese
arc
h
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Comparing Financial Efficiency
Source: Taylor, 2003
rese
arc
h
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Comparing Financial Efficiency
developer funded
rese
arc
h
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Comparing Financial Efficiency
council funded
rese
arc
h
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Comparing Financial Efficiency
rese
arc
h
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Comparing Financial Efficiency
rese
arc
h
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Comparing Financial Efficiency
rese
arc
h
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Comparing Financial Efficiency
rese
arc
h
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Comparing Financial Efficiency
rese
arc
h
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Comparing Financial Efficiency
rese
arc
h
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Comparing Financial Efficiency
rese
arc
h
TN(kg)
53LCC($)
rese
arc
h
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more cost effective
less cost effective
small assetlarge asset
rese
arc
h
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wetland
more cost effective
less cost effective
small assetlarge asset
rese
arc
h
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wetland
bioretention
more cost effective
less cost effective
small assetlarge asset
rese
arc
h
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wetland
bioretention
more cost effective
less cost effective
small assetlarge asset
x2
comparing financial efficiency of
wetlands and bioretention
rese
arc
h
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wetland
bioretention
more cost effective
less cost effective
small assetlarge asset
x2
comparing financial efficiency of
different size assets
rese
arc
h
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limitations on current study:
wetland
bioretention
more cost effective
less cost effective
small assetlarge asset
rese
arc
h
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- climatic conditions
- only one location (data)more cost effective
less cost effective
limitations on current study:
small assetlarge asset
rese
arc
h
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- sensitivity to renewal costs
more cost effective
less cost effective
limitations on current study:
small assetlarge asset
rese
arc
h
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more cost effective
less cost effective
- sensitivity to renewal costs
limitations on current study
small assetlarge asset
RCC: Reference Construction Cost
rese
arc
h
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Financial Efficiency - learnings
bioretention systems were able to
provide higher TN removal, per $
spend by Council over the asset life
larger systems are more efficient
(no surprises here)
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financial efficiency is however just one
criteria in appropriate asset selection!
rese
arc
h
$ per kg
site layout,
topography
environmental
values
catchment
characteristics
local amenity expertise
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rese
arc
h
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Stormwater
Sampling
rese
arc
h
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Better understanding of:
o pollutant loads
o distribution of loads throughout events
rese
arc
h
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WSUD asset testing
rese
arc
h
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Calibrating Asset Flow
ModelsTest Pollutant
Concentrations
Calibrate First-Order
Decay Models
WSUD asset testing
is the asset working as designed?
financial sustainability
both asset type and asset scale can have an
impact on required dollar spend per kg of
pollutant removed over the asset life
Urbanisation trends
(aus) 89% current population in urban areas.
population and urban coverage will continue
to grow
WSUD in Geelong
predicted to reach >$60m of WSUD assets by
2020, mainly through new growth areas
thankyou
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