165
Potential climate change impacts upon stormwater infrastructure include:
x
More frequent storms and higher summer rainfall intensities are likely to test capacity of storm water
systems. Potential for local and regional scale flooding.
x
Increased costs incurred to address capacity and maintenance of storm water and drainage.
x
Sea water intrusion into coastal freshwater systems and drainage systems.
x
Increase in pest mosquitos from summer pooling.
x
Changes in flood plains and in groundwater levels.
x
Potential for blockages and dry weather overflows during dry spells.
10.3.3. Roads
Table 10.5
below includes details of local roads that are the responsibility of Councils.
Each of the three councils report their road asset values using different measures. Using kerbing as a
common proxy (kerb length equating to approximately twice the length of roads), some comparability can
be achieved, as displayed in
Table 10.5
. Values include road and curbing. Refer to
Figure 10.2
.
Table 10.5: Local Government Road Assets
Area
Km
Value
1
($ million)
Port Adelaide Enfield
660
529
Charles Sturt
636
554
West Torrens
292
234
Study Area
1,588
817
Source: Council Asset Management Plans.
1. Estimated 2012 values, based on 3% indexing.
Potential climate change impacts upon roads include:
x
Seawater inundation (occasional and ongoing)
x
Flood impacts, causing deterioration of pavement and erosion of road reserve.
x
Increased frequency and damage to bridge infrastructure
x
Increased deterioration of pavement surface including bituminous flushing
27
as a result of prolonged
periods of heat. Capacities of culverts may not be adequate
x
Increased capital and operational expenditure
27
Flushing is a film of bituminous material on the pavement surface that creates a shiny and sticky when hot, resulting from the
upward migration of free asphalt. It occurs most often in the wheel paths during extended periods of hot weather. It reduces
frictional characteristics therefore causing safety hazards. Source: 3M Road Surface Guide
