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

3

survey poll:

how many

coffees have

you had today?

4https://www.polleverywhere.com/multiple_choice_polls/DaepgoW6mvz1cid

5

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

15

urb

an

isati

on

tre

nd

s

16

in rural environments

85% of precipitation is

evaporated or

transpired, while in an

urban environment this

figure is reduced to

around 15%

18

Flooding

Quality

19

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

22

WSUD

Cl 56 VPPBPEMG

24

WSU

D in

Geelo

ng

wetl

an

ds

25

bio

rete

nti

on

WSU

D in

Geelo

ng

26

WSU

D in

Geelo

ng

27

+ 50 GPTs

+ 200

streetscape

assets

WSU

D in

Geelo

ng

28

WSUD asset growth in CoGGW

SU

D in

Geelo

ng

29

WSUD asset growth in CoGGW

SU

D in

Geelo

ng

30

WSU

D in

Geelo

ng

31

WSU

D in

Geelo

ng

32

So

luti

on

s

wetlands and

sedimentation basins

33

WSU

D in

Geelo

ng

raingardens and

bioretention basins

34

WSU

D in

Geelo

ng

35

WSU

D in

Geelo

ng are the assets that are being installed, the most

sustainable for the ultimate asset managers?

36

37

“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

39

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

40

Comparing Financial Efficiency

rese

arc

h

41

Comparing Financial Efficiency

rese

arc

h

42

Comparing Financial Efficiency

Wetlands

Bioretention Basins

How about the size

of the asset?

$ per kg?

rese

arc

h

43

Comparing Financial Efficiency

Source: Taylor, 2003

rese

arc

h

44

Comparing Financial Efficiency

developer funded

rese

arc

h

45

Comparing Financial Efficiency

council funded

rese

arc

h

46

Comparing Financial Efficiency

rese

arc

h

47

Comparing Financial Efficiency

rese

arc

h

48

Comparing Financial Efficiency

rese

arc

h

49

Comparing Financial Efficiency

rese

arc

h

50

Comparing Financial Efficiency

rese

arc

h

51

Comparing Financial Efficiency

rese

arc

h

52

Comparing Financial Efficiency

rese

arc

h

TN(kg)

53LCC($)

rese

arc

h

54

more cost effective

less cost effective

small assetlarge asset

rese

arc

h

55

wetland

more cost effective

less cost effective

small assetlarge asset

rese

arc

h

56

wetland

bioretention

more cost effective

less cost effective

small assetlarge asset

rese

arc

h

57

wetland

bioretention

more cost effective

less cost effective

small assetlarge asset

x2

comparing financial efficiency of

wetlands and bioretention

rese

arc

h

58

wetland

bioretention

more cost effective

less cost effective

small assetlarge asset

x2

comparing financial efficiency of

different size assets

rese

arc

h

59

limitations on current study:

wetland

bioretention

more cost effective

less cost effective

small assetlarge asset

rese

arc

h

60

- climatic conditions

- only one location (data)more cost effective

less cost effective

limitations on current study:

small assetlarge asset

rese

arc

h

61

- sensitivity to renewal costs

more cost effective

less cost effective

limitations on current study:

small assetlarge asset

rese

arc

h

62

more cost effective

less cost effective

- sensitivity to renewal costs

limitations on current study

small assetlarge asset

RCC: Reference Construction Cost

rese

arc

h

63

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)

64

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

65

rese

arc

h

66

Stormwater

Sampling

rese

arc

h

67

Better understanding of:

o pollutant loads

o distribution of loads throughout events

rese

arc

h

68

WSUD asset testing

rese

arc

h

69

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

71