Post on 24-May-2020
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LANDSCAPE DESIGN 8
8.3 LANDSCAPE CONCEPT DESIGN SECTIONS
Refer to Figure 8.3.1 - 8.3.12 and refer to Landscape Plans for locations
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Ground-covers
Ground-covers
Ground-covers
Shared Path Path
Easement
Turning Lane Northbound Carriageway Southbound Carriageway Median Bus Stop
Cycle Lane
Cycle Lane Native Vegetation to Fenceline
Rai
lcor
p B
ound
ary
Existing Water Main,
py
Hig
h Po
wer
ele
ctric
ity tr
ansm
issi
on L
ines
Existing GroundShown Dashed
Shared Path with Bus Shelter Existing Vegetation
NorthboundCarriageway
SouthboundCarriageway
Existing Culvert to Remain
Median Turning LaneCycle Lane
ShoulderBus Lane Existing Vegetation
Rai
lcor
p B
ound
ary
Priv
ate
Pro
perty
( A
djus
ted)
Hig
h Po
wer
ele
ctric
ity tr
ansm
issi
on L
ines
Existing GroundShown DashedExisting Ground
Shown Dashed
Existing Water Main
Figure 8.3.1 Section A at Stn 760
Figure 8.3.2 Section B at Stn 870
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LANDSCAPE DESIGN 8
Hig
h Po
wer
ele
ctric
ity tr
ansm
issi
on L
ines
Existing GroundShown Dashed
Consider planting to base of wall
Native Groundcovers
with turf Northbound Carriageway Southbound CarriagewayFrangible Shrubs
in Median Shared Path Shrubs
Turf Local Road ( cul-de-sac turning circle) Native Planting Existing Vegetation
Shoulder
Shoulder
Existing Water Main
Rai
lcor
p B
ound
ary
Priv
ate
Pro
perty
Hig
h Po
wer
ele
ctric
ity tr
ansm
issi
on L
ines
Existing GroundShown Dashed
Consider planting to base of wall
Shrubs and Groundcovers
Shrubs and Groundcovers
Native Groundcovers
with turf Northbound Carriageway Southbound Carriageway
Frangible Shrubs in Median Shared Path VergeTurfed
strip Local Road Native Planting Existing Vegetation
Shoulder
Shoulder
Existing Water Main
Figure 8.3.3 Section C at Stn 940
Figure 8.3.4 Section D at Stn 980
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Rai
lcor
p B
ound
ary
cons
erva
tion
Are
a
Existing GroundShown Dashed
Feature Planting, Shrubs and Groundcovers Reinstate Native Vegetation Northbound Carriageway Southbound CarriagewayMedian Shared Path Verge Native Planting
Shoulder
Bus Lane
Cycle Lane
Bus Lane
Existing Water Main
Rai
lcor
p B
ound
ary
Priv
ate
Pro
perty
Hig
h Po
wer
ele
ctric
ity tr
ansm
issi
on L
ines
Existing GroundShown Dashed
Turfed Swale with Native Grasses and Scattered Trees
Native Groundcovers
with turf Northbound Carriageway Southbound CarriagewayFrangible Shrubs
in Median Shared Path Verge Local RoadTurf Strip Native Planting Existing Vegetation
Shoulder
Shoulder
Existing Water Main
Figure 8.3.5 Section E at Stn 1060
Figure 8.3.6 Section F at Stn 1260
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LANDSCAPE DESIGN 8
Shared Path
Verge, Native
Grasses
Verge, Native
Grasses
Verge, Native
GrassesNorthbound Carriageway Southbound CarriagewayShoulder Shoulder Native Grasses and Groundcovers with Scattered Trees
Rai
lcor
p
Con
serv
atio
n A
rea
Vegetated Swale
Median
Vegetated Swale with
Native Species
Re-instated Native
Vegetation
Existing Ground Shown Dashed Existing Water Main
Rai
lcor
p (A
djus
ted)
Con
serv
atio
n A
rea
( Wat
er C
atch
men
t)
Re-instated Native Vegetation
Existing GroundShown Dashed Existing Water Main
Shared Path Verge Verge
Northbound Carriageway Southbound CarriagewayShoulder Shoulder
Native vegetation with Scattered TreesVegetated
Swale Median
Figure 8.3.7 Section G at Stn 1440
Figure 8.3.8 Section H at Stn 1640
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Shared Path Verge Northbound Carriageway Southbound Carriageway Shoulder Shoulder Native vegetation with Scattered Trees
Rai
lcor
p
Priv
ate
Pro
perty
Vegetated Swale MedianVegetated Swale with Native Species
Existing GroundShown Dashed
Rai
lcor
p B
ound
ary
Con
serv
atio
n A
rea
Wat
er C
atch
men
t
Shared Path Northbound Carriageway
New Northbound Road Bridge New Southbound Road Bridge
Southbound Carriageway Existing vegetationExisting Vegetation, Revegetation if required, Native grasses,
groundcovers and scattered trees
100 Year Flood Level
Existing Vegetation
Revegetated Creek Bed with Scour
Protection
Existing GroundShown Dashed Existing Water Main
Cut Rock Creek
Figure 8.3.9 Section I at Stn 1700
Figure 8.3.10 Section J at Stn 1820
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LANDSCAPE DESIGN 8
Priv
ate
Pro
perty
Priv
ate
Pro
perty
Feature planting with native shrubs Northbound Carriageway Southbound Carriageway
Cyclist Lane Bus Stop
Cyclist Lane Turning Lane Bus Stop Path Service Road
Native Groundcovers with Scattered Trees
Groundcovers
Ground coversShared Path
Existing GroundShown Dashed
Park
con
tinue
s be
yond
Priv
ate
Pro
perty
( A
djus
ted)
Make good of existing turf with
street trees
Native Grasses, Groundcovers and
Scattered Trees Service RoadExisting Vegetation
Turf to match
existingExisting Vegetation
Existing Park
Access Northbound Carriageway Southbound CarriagewayMedian Turning LaneTurning LaneCyclist Lane
Shared Path Shoulder
Existing GroundShown Dashed
Figure 8.3.11 Section K at Stn 1980
Figure 8.3.12 Section L at Stn 2110
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Priv
ate
Pro
perty
Easement
Priv
ate
Pro
perty
( A
djus
ted)
Native Groundcovers Northbound Carriageway Southbound Carriageway
Shared Path
Shoulder Shoulder Service Road
Turf with Street Trees
Planted Median with Safety Fence
Ground covers with Street Trees
Priv
ate
Pro
perty
(Hot
el)
Priv
ate
Pro
perty
( A
djus
ted)
Native Groundcovers
with Street TreesNative
Groundcovers Northbound Carriageway Southbound Carriageway
Planted Median with Safety Fence
Shared Path
Ground covers with Street Trees
Shoulder Shoulder
Existing GroundShown Dashed
Figure 8.3.13 Section M at Stn 2160
Figure 8.3.14 Section N at Stn 2220
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LANDSCAPE DESIGN 8
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8.4 ENVIRONMENTALLY SUSTAINABLE DESIGN (ESD) PRINCIPLES
– Where possible utilise naturally low lying areas for detention basins, if required.
– Consider the reuse of captured water for the irrigation of the landscaping during the establishment period and by passive means such as slowing cross flow stormwater to allow it to infiltrate slowly into the soil profile .
– Reuse existing good quality topsoil in planting areas and as the top layers of soil on batters to reduce the amount of imported material used on site.
– Use grindings from native trees removed from the site for mulch in landscaped areas.
– Use plants and materials that are sourced locally where possible.
– Use plants from the local plant communities . These are less likely to require maintenance. .
8.5 WATER SENSITIVE URBAN DESIGN (WSUD) PRINCIPLES
– Where space and gradients allow, incorporate landscaped open drainage swales along the edges of the road.
– Where possible, incorporate drainage swales in depressed landscaped medians and use macrophyte/sedge plantings to provide enhanced water quality function.
– Review super elevation so water runoff to planted swales can be maximised. Less kerb and more gravel/grass verges will help maintain/reinforce the local character.
– Basins to be shallow (or otherwise designed) to avoid the need for safety fencing.
– Eliminate, where possible, concrete lined channels and hard engineering to basins. Implement soft engineering principles in the drainage design.
– Incorporate Water Sensitive Urban Design into the drainage solution where practicable.
Swale drains have been incorporated at the following locations;
1. Turfed swale at the northern corner of Ourimbah Street
2. Turfed swale alongside shared path at Stations 950-1080
3. Planted swales in landscaped areas draining to Cut Rock Creek on the western side of the highway from 1320-1540 with macrophyte planting in the invert of swale
4. Planted swale on the eastern side of the highway draining to Cut Rock Creek at Stations 1830-1900
5. Grassed swale behind the shared path at Lions Park at Stations 1900-2000
6. An RT kerb, or concrete swale has been proposed between Stations 1790-1870. It is recommended that this be a grassed swale for both environmental reasons and improved visual amenity.
Each of these carry out a water quality function by filtering sediment and slowing flows to the creek system
8.6 ECOLOGICAL RESTORATION
Draft Ecological Assessment prepared by Hyder for Stages 3A and 3B – Railway Crescent Lisarow to Glen Road Ourimbah (Sept 2009) proposes mitigation measures to safeguard biodiversity within the study area including a recommendation to include an ecological restoration program involving locally endemic flora. The 100% Landscape Concept Plan proposes that the landscape zone to the west of the highway between Stations 1300 to 1850 qualifies for such treatment for the following reasons;
1. This area incorporates the Cut Rock Creek riparian corridor and connects to the Freshwater Typha Wetland;
2. It is connected to a significant patch of remnant bushland between Teralba Street and Cut Rock Creek;
3. Specimens of Melaleuca biconvexa occur in this section, with retaining structures proposed to protect them. Further plantings of M. biconvexa in this area will ensure that there is no net loss (and in fact an increase. The Ecological Assessment proposes an offset strategy of at least three times should be adopted)) of canopy cover of this endangered species;
4. It is largely weed infested and requires extensive weed control measures; in any case;
5. The shared path winds through this area. Ecological restoration will provide an attractive setting for the path and relief from proximity to the highway as it traverses this zone, and be a community asset.
6. The vegetation will also serve a water quality function with swale drainage proposed for this area. The proposed cross-section creates a micro-environment suited to the Swamp Sclerophyll Forest Vegetation Community.
7. The proposed zone is approximately 10-20m wide and 500m long or close to 0.7 hectares
.
The proposed planting for this area will consist of a canopy comprising Swamp Mahogany, Bangalay, M. biconvexa, Cabbage Tree and Bangalow Palms, a mid story of rainforest trees and shrubs (largely to the rear to ensure passive surveillance for the shared path) and an understorey of sedges (in swales) and tussock plants (on embankments). All plants will be endemic species and ideally from locally sourced propagules.
Integrated Bush Management within Ecological Restoration Zone
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PLANTING 9
9 PLANTING
9.1 PLANTING PRINCIPLES
– Incorporate indigenous plant species within the highway corridor that are consistent with those adjacent to the highway;
– Planting at and around intersections, bus stops and pedestrian crossings should be local indigenous species grouped in visually interested formations.
– Planting adjacent to remnant bushland should reflect the composition of the vegetation community to enhance the physical and visual connectivity.
– In feature areas, trees and shrubs should be planted as advanced stock to quickly achieve an established landscape effect. Trees shall be a minimum 25L pot size.
– Position all new trees with a trunk diameter or potential trunk diameter greater than 100mm outside of the RTA specified clear zone.
– Street tree species in the Ourimbah township are to match in scale the street tree variety used in the Stage 2 Glen Road to Burns Road Upgrade.
– Establish new Swamp Mahogany, Allocasuarina littoralis and other diagnostic trees, shrubs and groundcovers plantings from the Swamp Sclerophyll Forest through the upgrade to establish a green corridor and to re-establish fauna corridors and crossings.
– Low planting at road edges to accommodate necessary sight lines and clear zones. Planting is to provide screening for the residential properties from the visual impacts of the road and rail corridors.
– Median planting to consider maintenance access, visibility, and will be frangible and non-wildlife attracting species to minimise wildlife roadkill.
– Sedges and other plants from the Alluvial Paperbark Sedge Forest capable of withstanding periodic inundation have been used in these medians wales. These will perform a water quality function, as well as headlight screening and respond to the surrounding context. Frangible species include Callistemon shiressii, Banksia spinulosa, and Melaleuca sieberi and the sedges Baumea sp, Juncus sp. and Schoenus sp.
– Planting to consist of large expanses of the same species to simplify maintenance and provide a minimal yet effective visual appearance.
– The endangered species Melaleuca biconvexa may be removed as a result of the upgrade. Identified specimens could be transplanted, however it would be most appropriate to implement a propagation strategy (nursery grown by seeds or cuttings) to provide specimens of the species for replanting the upgrade. Propagation material should come from the existing trees to ensure endemism. The result should be a three times increase to ensure a long term net gain of M. biconvexa within the study area.
– Other species (eg; Callistemon spp. & Syzygium paniculatum) could also be transplanted, however they occur amongst other plants which makes transplanting a difficult process with low success rates. Facilitate a propagation programme of endemic species required.
– Existing road pavement where planting occurs is to removed and the subgrade ripped, following by soil preparation as for other areas.
– Plant sourcing and propogation should commence well ahead of the proposed construction programme.
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9.2 PLANTING PALETTE
This floristic diversity of the study area contributes to the character of the various landscape precincts identified in the landscape analysis. It also provides all of the trees, palms, shrubs, groundcovers and sedges required for specific uses (such as screening, filtering and erosion control, median planting and feature trees) throughout the alignment. Many of the component species are superior and well-regarded ornamental species. For these reasons we have not found it necessary to include any exotic plantings in the project.
Notable species from the existing vegetation communities through which the alignment passes and which are likely to be proposed in the final design include:
Species Common Name
Freshwater Typha Wetland
Swales, Creek Crossings and
Bioretention Basins
Coastal Narabeen Moist Forest
Dora St Shops to End of Cemetery Station
300-630
Alluvial Paperbark Sedge Forest
Station 630-1850
Ourimbah township Station 1850-2350
Tall Trees
Allocasuarina littoralis Black She Oak
Alphitonia excelsa Red Ash
Argyrodendron actinophyllum
Black Booyong
Ceratopetalum apetalum Coachwood
Diploglottis australis Native Tamarind
Eucalyptis amplifolia Cabbage Gum
Eucalyptus botryoides Bangalay
Eucalyptus pilularis Blackbutt
Eucalyptus robusta Swamp Mahogany
Eucalyptus saligna Blue Gum
Syncarpia glomulifera Turpentine
Syzygium oleosum Blue Lilly Pilly
SMALL TREES
Acmena smithii Lilly Pilly
Melaleuca quinquenervia
Broad-leaved Paperbark
Elaeocarpus obovatus Blueberry Ash
Ficus coronata Sandpaper Fig
Glochidion ferdinandi Cheese Tree
Melaleuca biconvexa Biconvex Paperbark
Melaleucal linearifolia Flax-leaved Paperbark
Melaleuca styphelioides Prickly-leaved Tea Tree
Polyscias elegans Celerywood
Syzygium paniculatum Magenta Cherry
Tristaniopsis laurina Water Gum
Palms
Archontophoenix cunninghamiana
Bangalow Palm
Livistona australis Cabbage Tree alm
Shrubs
Acacia longifolia Sydney Golden Wattle
Acacia prominens Gosford Wattle
Banksia oblongifolia Fern-leaf Banksia
Banksia spinulosa Hairpin Banksia
Callistemon salignus Willow Bottlebrush
Callistemon shiressii White Bottlebrush
Cordyline stricta Narrow-leaved Palm Lily
Species Common Name
Freshwater Typha Wetland
Swales, Creek Crossings and
Bioretention Basins
Coastal Narabeen Moist Forest
Dora St Shops to End of Cemetery Station
300-630
Alluvial Paperbark Sedge Forest
Station 630-1850
Ourimbah township Station 1850-2350
Dodonaea triquerta Hop Bush
Decaspermum humile Silky Myrtle
Hakea teretifolia Needlebush
Leptospermum polygalifolium
Tantoon
Shrubs (cont.)
Melaleuca nodosa Prickly-leaved Paperbark
Melaleuca sieberi
Omalanthus populifolius Bleeding Heart
Prostanthera askania Tranquility Mintbush
Groundcovers, lilies, grasses, accent plants
Carex appressa Tall Sedge
Dianella caerulea Paroo Lily
Doryanthes excelsa Gymea Lily
Entolasia marginata Bordered Panic
Entolasia stricta Wiry Panic
Hardenbergia violaceae Native Sarsasparilla
Lomandra filiformis Wattle Mat Rush
Lomandra hystrix Slender Mat Rush
lomandra longifolia Spiny-headed Mat Rush
Oplismenus aemulus
Oplismenus imbecillis
Themeda australis Kangaroo Grass
Viola hederaceae Native violet
Xanthorrhoea resinosa Grass Tree
Wetland plants- Sedges
Crinum pedunculatum Swamp Lily
Banksia robur Swamp Banksia
Baumea articulata Jointed Twig Rush
Baumea juncea
Baumea rubiginosa
Eleocharis sphacelata
Gahnia clarkei Tall Saw-sedge
Gahnia sieberiana Red-fruit Saw-sedge
Lepironia articulata
Leptocarpus tenax
Ludwigia peploides subsp. montevidensis
Water Primrose
Persicaria decipiens Slender Knotweed
Persicaria strigosa
Philydrum lanuginosum Wooly Waterlily
Phragmites australis Common Reed
Restio (Baloskion) tetraphyllus
Tassel-cord Rush
Schoenus brevifolius Zig-Zag Bog-rush
Typha orientalis Broad Leaf Cumbungi
Villarsia exaltata Yellow Marsh Flower
Viminaria juncea Native Broom
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PLANTING 9
Acm
ena
smith
ii
Lilly Pilly
Elae
ocar
pus
obov
atus
Hard Quandong
Acac
ia p
rom
inen
s
Gosford Wattle
Mel
aleu
ca li
near
ifolia
Megalong Valley BottlebrushP
olys
cias
ele
gans
Celery Wood
Syz
ygiu
m p
anic
ulat
um
Magenta Cherry
Pros
tant
hera
ask
ania
Tranquility MintbushC
allis
tem
on s
hire
ssii
White Bottlebrush
Cor
dylin
e st
ricta
Narrow Palm Lilly
Dec
aspe
rmum
hum
ile
Silky Myrtle
Dor
yant
hes
exce
lsa
Gymea Lilly
Har
denb
ergi
a vi
olac
eae
Native Wisteria
Lom
andr
a fil
iform
is
Wattle Mat Rush
Euca
lypt
us s
alig
na
Sydney Blue Gum
Syn
carp
ia g
lom
ulife
ra
Turpentine
Argy
rode
ndro
n ac
tinop
hyllu
m
Alph
itoni
a ex
cels
a
Red Ash or Soap Tree
Black Booyong
Dip
logl
ottis
aus
tralis
Native Tamarind
Euca
lypt
us ro
bust
a
Euca
lypt
us p
ilula
ris
Blackbutt Swamp Mahogany
Euca
lypt
is a
mpl
ifolia
Cabbage Gum
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Phra
gmite
s au
stra
lis
Common Reed
Glo
chid
ion
ferd
inan
di
Cheese Tree
Mel
aleu
ca b
icon
vexa
Biconvex Paperbark
Cal
liste
mon
sal
ignu
s
Willow Bottlebrush
Tris
tani
opsi
s la
urin
a
Water Gum
Dia
nella
cae
rule
a
Paroo Lilly
Lom
andr
a hy
strix
Slender Mat Rush
Lom
andr
a lo
ngifo
lia
Spiny Headed Mat Rush
Arch
onto
phoe
nix
cunn
ingh
amia
na
Bangalow Palm
Livi
ston
a au
stra
lis
Cabbage Tree Palm
Them
eda
aust
ralis
Kangaroo Grass
Viol
a he
dera
ceae
Native Violet
Typh
a or
ient
alis
Broad Leaf Cumbungi
Bau
mea
arti
cula
ta
Jointed Twig Rush
Bau
mea
junc
ea
Bare Twig Rush
Sch
oeno
plec
tus
valid
us
River Club Rush
Car
ex a
ppre
ssa
Tall Sedge
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ROAD FURNITURE 10
10 ROAD FURNITURE PRINCIPLES
– Provide a standardised and consistent palette of road furniture along the corridor using elements that are robust, readily available and of low maintenance materials and finishes.
– Incorporate road furniture used in recent upgrade works on the Pacific Highway and incorporate where appropriate to provide consistency in road corridor treatment.
– Integrate the location and design of road furniture elements with the engineering, urban and landscape design features.
10.1 FENCES
– Fencing required on top of retaining walls should be open style metal fencing, recessive in colour and where appropriate, match previous upgrade works. Planting should be located in front of fence if space allows.
– Road design should minimise the use of roadside pedestrian barrier fencing. If required, it should be the standard RTA steel open style fence in a recessive colour in the semi-rural precincts and a galvanised finish in the township precinct.
– Simple timber post and rail fencing in natural finish to large lots, open space or vegetated areas.
– A palette of fencing options to be developed for the fencing to residential front boundaries to retain the natural diversity of residential frontages facing the highway at detailed design phase.
– Fencing for side and rear residential boundaries should be simple timber lapped and capped fence or a Colorbond panel fence with the colour to be selected by property owner.
– Consider vegetation as fencing where occurs in existing context
– The entry gates and associated fencing along the frontage Lisarow Cemetery are to be restored and repaired and/or replaced. Any additional fencing is to match or compliment the existing, e.g High quality open style metal fencing in a recessive colour, to match into the existing sandstone pillars and gates.
– Fencing may be necessary along the boundary of the Lions Club Rest Area. Consider timber post and rail fencing with dark chain link or similar inserts for child proofing. Provide open visibility from road corridor into the park.
The Detailed Design will include the design of railings, handrails, pedestrian barriers, safety fencing around water quality control ponds where required, on the railway boundary and residential property fencing. The fence type selection will be consistent with those used on current Pacific Highway upgrades and as appropriate to the context. Suitable fencing types are shown in the following images and the locations shown in the following plans.
RTA Standard picket fencing RTA Standard Type 1 fencing with black finish
10.2 FENCING PLANS
Refer to Figures 10.2.1-10.2.3