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COVENANT REHABILITATION PLAN (CRP). LOT 4 ON RP809059 - 33 PAVILION STREET POMONA QLD 4568 TO SUPPORT PROPOSED RECONFIGURATION OF ALOT (RAL) DEVELOPMENT APPLICATION PREPARED BY NORTH COAST ENVIRONMENTAL SERVICE FOR PSP DEVELOPMENTS PTY LTD INDEX RPOO - COVER PAGE RP01 - SITE CONTEXT RP02 - REHABILITATION AREA DETAIL RPO3 - WEED MANAGEMENT SPECIFICATION RP04.1 - REVEGETATION SPECIFICATION 1 of 2 NOOSA COUNCIL RP04.2 - REVEGETATION SPECIFICATION 2 of 2 REFERENCE DOCUMENT RPOS - FENCING DETAIL RAL23/0013.02 30 MAY 2025 RPO6 - PERFORMANCE CRITERIA
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Full text of sections 2 to 26 (of 63)
Section 2
WEED MANAGEMENT WEED COVERAGE CONTRACTOR NOTES A list of typically occurring weed taxa observed within the site is detailed in Table 1 with WEED SPECIES TO BE CONTROLLED indicative conditions within the Rehabilitation Area depicted in Plate C. Weed management is to include the management of all environmental weeds from TABLE 1 - COMMON AND OBSERVED WEED SPECIES LIST Rehabilitation Area (refer RPO1 Plate A) including weeds listed in the following Form Key — T= Tree S= Shrub H= Herb V= Vine G= Grass documents: Botanical Name Form | Common Name Status « Declared plants under the Land Protection (Biodiversity Act 2014 and sub- "AGG FatLitn HOUSTORTERET) H Blue bil t d 1 ordinate Regulation 2016); ae a CONS IOIET ue ilygoat Wee) * Weeds of National Significance (WONS) under the Commonwealth Ardisia crenata Ss Coral berry | Government Weeds strategy; Cinnamomum camphora T Camphor laurel R . Nene Naturalised Plants in South East Queensland, 2002, Queensland Lantana camara S Lantana R erbarium; . Noosa Local Government Area Pest Management Plan 2015-2019; Paspalum spp. 7 Paspalum _ | « Undesirable Species listed in Planning Scheme Policy 3 Landscaping Plants Senna pendula var. glabrata Ss Easter cassia | and Guidelines; and Status * — Any other exotic plants known to exhibit weed characteristics (i.¢., Invasive, competitive characteristics). MAINTENANCE PERIOD Weed management is to comprise treatment application to all observable exotic taxa as required. Treatment must continue until declared plants have been controlled (i.e., they are visually dead or dying). The frequency of treatment shall be determined in conjunction with the contractor and be designed to achieve off maintenance at the end of a 12 month performance maintenance period. GENERAL METHODS All works are to be conducted in line with the SEQ Ecological Restoration Framework. All weed treatments to comply with Minor Use Permit PER11463 & 82307, product labels and individual SDS, and other applicable permits as well as the Chemical Usage (Agricultural and Veterinary) Control Act 1988, Agricultural Chemical Distribution and Control Act 1966, and the Work Health and Safety Act 2011 (including all applicable Regulations). All weed management works are to be conducted by experienced persons proficient in both native species and weed species identification. The method adopted for removal of weeds from the site will be dependent upon the physical stage of development of individual weed specimens. Only herbicides registered for aquatic use as detailed on the manufacturer's specifications are to be applied within or immediately adjacent to waterbodies/waterways. Herbicide sprays should be applied in non-windy conditions in order to prevent incidental poisoning of native species and not on days preceding forecast rainfall. A period of three to four weeks is usually required between herbicide application and revegetation. ¥ \ RECONSTRUCTION VS. ASSISTED NATURAL REGENERATION Plate C —- Weed conditions within western Rehabilitation Area Due to the sparse vegetation density and low-moderate level of weed presence within the Rehabilitation Area, the application of an assisted natural regeneration technique is not feasible and comprehensive revegetation works will be required. The native vegetation already present within the Rehabilitation Area should be retained in-situ as it represents the earliest opportunity for direct natural regeneration to occur via seed dispersal. NOOSA COUNCIL REFERENCE DOCUMENT RAL23/0013.02 30 MAY 2025 PROJECT TITLE posostsreapu tan cigasn [COVENANT REHABILITATION PLAN PSP DEVELOPMENTS PTY LTD [=== ==] WEED MANAGEMENT SPECIFICATION | J001178 RPO3 / ‘ev eoee w= |33 PAVILION STREET, POMONA QLD (4RP809059) <r ia yung rar see W
Section 3
REVEGETATION SPECIFICATIONS
REVEGETATION DESIGN
The Rehabilitation Area (Vegetation Covenants) includes approximately 1.02ha of
land which is host to sparse vegetation density with high percentage of pasture grass
presence (refer Plate D). This area will require direct revegetation of suitable native
species.
Revegetation is to include species drawn from the species palette listed in Tables 2
and 3 to achieve the performance criteria listed in Table 4 (refer RP06).
Plate D —- Example of denuded area (foreground)
REVEGETATION METHODOLOGY
The methodology for the revegetation program is to generally occur in the following
chronological order:
Revegetation Area 1
1. Clearly mark any existing native species that may be obscured within the weed
control areas to prevent incidental damage during site preparation and weed
control activities.
Slash entire revegetation zone.
3. Undertake comprehensive weed control, including control/removal of woody
weed species.
4. Delineate planting rows and stem locations
N
5. Apply herbicide treatment to each planting location (500mm radius spray zone
around stem location)
6. Once herbicide treatment has taken effect, install Canopy and Small Trees.
7. Water in plants as required.
8. Apply mulch.
9. | Undertake maintenance for duration of the 12 month maintenance period.
10. Slash reemergent grass between planting rows.
11. After completion of 9 months maintenance apply herbicide to remaining grass
cover and install understorey species.
Revegetation Area 2
1. Undertake comprehensive weed control, including control/removal of woody
weed species as well as herbicide treatment of all herbaceous weeds and
pasture grasses.
Once herbicide treatment has taken effect, plants can be installed.
Water in plants as required.
Apply mulch.
Undertake maintenance for duration of the 12 month maintenance period.
a RWN
W
North Coast
Environmental
Services
Environmental Management Consultants
PO Box 385 Peregian Beach OLD 4573,
COVENANT REHABILITATION PLAN
fewooezs ww025 !33 PAVILION STREET, POMONA QLD (4RP809059) A
PLANTING METHOLOGY
Planting
Once weed treatment has taken effect, individual planting holes are to be manually
dug or by mechanical auger at the densities prescribed within this Plan. Plants are to
be provided as 50mm native tubestock. As a minimum, all tubestock is required to:
¢ Have a significantly established root system;
¢ Not display signs of ‘yellowing’, leaf or stem damage or disease, root
curling/girdling or restriction related to being ‘pot bound’;
e Shrubs to have a single, straight trunk that is a minimum of 25cm tall for 50mm
tube-stock; and
e¢ Be sun hardened.
All tubestock is to be installed as per the Specification detailed in Figure 1.
2
Tot
tt
») TUBE STOCK PLANTIN
REFER SPECIFICATIONS AND CAD
EMBELLISHMENT INDEX
100MM DEPTH MULCH. FORM SHALLOW DISH
DRAIN TO BASE OF PLANT. MULCH NOT TO BE IN
CONTACT WITH PLANT STEM.
REFER SPECIFICATIONS
MIN 200MM DEPTH FRIABLE GARDEN BLEND SOIL
(DEPTH TO BE DETERMINED ON EXISTING SOIL
SUBSTRATE)
REFER SPECIFICATIONS
SLOW RELEASE FERTILISER WHERE REQUIRED
REFER SPECIFICATIONS
200
150, MIN
DECOMPACT SUBGRADE TO 150MM DEPTH.
WATER CRYSTALS WHERE REQUIRED (AVOID
PLACING UNDER ROOTBALL)
YOQs S
YS ey REFER SPECIFICATIONS
SIDE PLANTING HOLE DIAMETER 2 X
PLANT POT DIAMETER
EXISTING SUBGRADE
TYPICAL DETAIL - TUBE STOCK
SCALE 1:20
Figure 1 — Tubestock Planting Specification
Watering
Planting is to occur as follows;
. Planting must not occur unless soil moisture is adequate;
. All stock must be watered immediately prior to planting;
. All planting holes are to be pre-watered prior to installation of tubestock; and
° Apply an initial establishment watering and continue to water as required to
ensure survival.
Mulch
Each plant installed on a slope of <1:3 gradient is to have a minimum 500mm radius ‘ring’
of organic mulch (e.g., sugar can mulch or forest blend) applied to a depth of 100mm and
adequate mulch covering must also be present at the point of off-maintenance (i.e.,
minimum 50mm mulch coverage should be available). Tip mulch is prohibited due to high
weed propagule content. Each plant installed on a slope of >1:3 gradient and below the
top of bank (inclusive of the external batter of the bio basin) of all waterways (both
permanent and intermittent) are to be protected by a 400mm radius coir mat fastened
with a single min 300mm stake/pin.
Plant Diversit
The following minimum diversity must be implemented:
Revegetation Area 1
*« Canopy Trees and Small Trees/Shrubs — No less than 5 species from Table 2;
Understorey species — No less than 3 species from Table 2
PSP DEVELOPMENTS PTY LTD [<==
PRELIMINARY
Revegetation Area 2
« Small Trees — No less than 3 species from Table 3, Understorey species — No
less than 3 species from Table 3
NOTE: No canopy species are to be planted within Revegetation Area 2.
Plant Density
Revegetation Area 1
* Canopy Trees & Small Trees 3m centres and Understorey species 2m centres
Revegetation Area 2
« Small Trees 3m centres, Understorey species 1m centres
Edge Treatment (refer RP-02)
A dense linear edge planting treatment is to be provided to the perimeter of the
Rehabilitation Areas as specified by yellow linework on RP02 and as follows:
« 1x row of alternating Lomandra hystrix and shrub/small tree species at 1m
centres
* Shrub species to comprise Alphitonia excelsa, Syzgium smithil, & Melaleuca
viminalis
NOTE: Planting location of the general edge treatment should be setback a minimum
of 0.5m from the edge of the Rehabilitation Areas, allowing for the mature growth
size of Lomandra spp.
Planting Species Palette
A list of suitable species to be used is presented in Tables 2 & 3. Additional species may
be used if they are locally indigenous to the Regional Ecosystem 12.3.2 Eucalyptus
grandis talf open forest on alluvial plains. Where the species listed are not available at time
of works then similar native alternatives that occur within the local vegetation communities
may be utilised. Species substitution must be approved by NSC.
TABLE 2 — REVEGETA TON AREA 1 SPECIES LIST
Canopy Trees
PLANT SPECIES COMMON NAME
Castanospermum australe black bean
Eucalyptus grandis flooded gum
Eucalyptus microcorys tallowwood
Lophostemon confertus brushbox
Lophostemon suaveolens swamp box
Syzygium francisii giant watergum
Elaeocarpus obovatus hard quandong
Small trees
PLANT SPECIES COMMON NAME
Alphitonia excelsa red ash
Archontophoenix cunninghamiana bangalow palm
Backhousia citriodora lemon myrtle
Commersonia bartramia brown kurrajong
Glochidion sumatranum umbrella cheese tree
Macaranga tanarius macaranga
Mallotus claoxyloides green kamala
Melaleuca viminalis
Neolitsea dealbata
weeping bottlebrush
hairy-leaved bollygum
Polyscias elegans celery wood
Syzygium smithii narrow-leaved lillipilli
ISSUE DETALS
==ss_x =| REVEGETATION SPECIFICATION 1 of 2 |J001178 RPO4.1 C
a arin uIMITTED 16 ANY FORA CR BY Ary —
NOOSA COUNCIL
REFERENCE DOCUMENT
RAL23/0013.02 30 MAY 2025
se,
Section 4
Understorey PLANT SPECIES COMMON NAME Calochlaena dubia soft bracken fern Carex appressa tall sedge Cordyline rubra palm lily Dianella caerulea blue flax lily Eupomatia laurina bolwarra Lomandra hystrix matrush # No canopy species are to be planted within Revegetation Area 2. TABLE 3 — REVEGETATON AREA 2 SPECIES LIST Small trees PLANT SPECIES COMMON NAME Alphitonia excelsa red ash Archontophoenix cunninghamiana bangalow palm Tristaniopsis laurina water gum Polyscias elegans celery wood Syzygium smithii narrow-leaved lillipilli Understorey PLANT SPECIES COMMON NAME Carex appressa tall sedge Cordyline rubra palm lily Eupomatia faurina bolwarra Lomandra hystrix matrush FENCING TO PROTECTED LAND Permanent fencing must be constructed as per Plate E on RPOS. The fence must be constructed to the following specifications: a. 1.2 metres high; b. 3 strand plan wire (no barb); c. Bottom strand no less than 300mm off the ground; d. Include pedestrian access gates (refer Plate D on RP05 for indicative locations); and c. Include AS sized signage with the wording “Vegetation Protection Covenant Area — No domestic animals” every 15m, be durable, weather resistant and visually complementary to the natural environment. snagement Consultants PO Box 385 Peregian Boach OLD 4573 PROJECT TITLE COVENANT REHABILITATION PLAN Aewvonezs wees !33 PAVILION STREET, POMONA QLD (4RP809059) CONTRACTOR NOTES: PSP DEVELOPMENTS PTY LTD CONTRACTOR NOTES: a wir cHKE NOOSA COUNCIL REFERENCE DOCUMENT RAL23/0013.02 30 MAY 2025 =~} REVEGETATION SPECIFICATION 2 of 2 cov cue oe TED ay FM CB HY J001178 RPO4.2
Section 5
LEGEND
EXISTING CONTOURS (0.5m INTERVALS)
ENANT
EXIST
N COV
1:3
84 PROPOSED CONTOURS (0.5m INTERVALS)
1:3
ETATIO
IDE VEG EXISTING KERB & CHANNEL
10m W
EXISTING DRAINAGE
85
S EXISTING SEWER
A DAM CONTAINING NO MORE THAN 500m³ MAY BE W EXISTING WATER
INSTALLED TO LOT 8 OUTSIDE OF THE COVENANT AREAS
PROPOSED KERB & CHANNEL
600
601 8 PROPOSED STORMWATER DRAINAGE
SP324164 R PROPOSED ROOFWATER DRAINAGE
SEDIMENT FOREBAY
S PROPOSED SEWER
ADDITIONAL 1:4 1:3 AN AREA OF SHALLOW CUT IS TO BE PROVIDED WITHIN THE FLOODPLAIN IN LOT 8,
BIORETENTION W PROPOSED WATER
AREA TYP PRE-DEVELOPED FLOOD EXTENT. CLEAR OF THE VEGETATION COVENANTS, TO OFFSET THE LOSS OF FLOODPLAIN
REFER STORMWATER MANAGEMENT PLAN STORAGE. REFER STORMWATER MANAGEMENT PLAN (BY OTHERS). PROPOSED TOP OF BATTER
(BY OTHERS) PROPOSED TOE OF BATTER
E
PROPOSED RETAINING WALL
H1.0 PROPOSED RETAINING WALL HEIGHT
PROPOSED ROAD PAVEMENT
86
E
PROPOSED CONCRETE PATHWAY
SC
PROPOSED CONCRETE DRIVEWAY
S
PROPOSED EARTHWORKS
1:2
W
AUGMENTATION OF EXISTING CUT FILL
E
BIORETENTION/DETENTION BASIN & WEIR PER STAGE 3 TOE OF BATTER
S
STORMWATER MANAGEMENT PLAN (BY OTHERS) 1:4
NOM 1:2
BATTER SLOPE MANAGEMENT
E
W
STAGE 2 TOE OF BATTER < 1 : 4 SLOPES SHALL BE GRASSED
1 : 3 SLOPES SHALL BE PLANTED*
S
6 1 : 2 SLOPES SHALL CONSIST OF LEVEL 1 FILL WITH PLANTING*
E
SP324164 * PLANTING DETAILS TO BE DETERMINED DURING OPW PHASE
W
JOIN NEW FOOTPATH &
ROAD NEATLY TO EXISTING CONNECT TO EXISTING SEWER
S
LOT 8
E
1:100
1:100
NOM
NOM
1:3
CT177.313
CT204.384
BUILDING PLATFORM
1:4
TC211.65
W
1:3
87
280
180
183
190
200
S
210
CT232.48
E
87
TC239.751
1m WIDE DRAINAGE SWALE TO DIRECT FLOWS TO THE VEGETATION COVENANT
3
220
W
230
E
250
260
270
290
294
300
310
E
E E E E E E E
3
S S S S S S S
S
S W
E
S
S
S S
W
S
S
S S
EARTHWORKS TO BE WHOLLY WITHIN THE SUBJECT SITE (TYP)
TYP TYP
2m WIDE CONCRETE PATH
3%
1:3
4
S
SC
3%
E
SP179876
S
W
D
S
SC
S
H
SK103
E
W W W W W A 0.5%
W S
C RELOCATED D4-5 HAZARD BOARD FROM END OF EXISTING ROAD
SC
SK103
S
S
W
W
W
W S
W
W S S S BS S S S S S S S S SK103
H R H
TAKE UP & RELOCATE EXISTING D4-5 W W W W W
SK103 W W W W W W W W TERMINATE WATER MAIN FOR POTENTIAL FUTURE CONNECTION AS PER SEQ CODE
E
HAZARD BOARD TO END OF NEW
ROAD EXTENSION
W
W W W W
H0.0 H1.5 H0.0
S
E
W
H0.0 H1.0 H0.0 SK103
CONNECT TO EXISTING WATER MAIN. EXISTING
E
SEWER HCB (TYP) WATER PROPERTY
R
HYDRANT TO BE RETAINED. USE EXISTING TAPPING CONNECTION (TYP) 4m WIDE CONCRETE DRIVEWAY AS PER NSC STD DRGS RS-049 & RS-050.
BAND FOR NEW LOT 3 PROPERTY SERVICE.
W W REFER DRG SK102 FOR SWEPT PATH.
S
TURNING FACILITY. 1:2
REFER DRG SK102 FOR SWEPT PATH.
E
R
7
W
SP324164
88
NOOSA COUNCIL
S
LOCAL ROAD PER NOOSA COUNCIL PLANNING SCHEME
REFERENCE DOCUMENT
E
6m WIDE (K-K) : TYPE M1 K&C
R
RAL23/0013.02 30 MAY 2025
PLACE
W
1:100
1:100
1:100
1:100
1:100
NOM
NOM
NOM
NOM
NOM
S
E
R
W
6 7
E
MAJESTIC
S
R
88 88
S S
H0.0
2 3
E
4
R
3m WIDE CONC. ACCESS FOR LOT 5
E
W
89
E 3m WIDE CONCRETE DRIVEWAY AS
S
PER NSC STD DRGS RS-049 & RS-050
R
89 INTERIM 1.5m STORMWATER EASEMENT (STAGE 1)
89
TO BE EXTINGUISHED IN STAGE Section 6
2
ENTRY MANOEUVRE
E
R
90 EXIT MANOEUVRE
W
S
COMBINED RETAINING WALL / BATTER INTERFACE TO OPTIMISE
J:\2023\23539SD2_33 Pavilion St, Pomona - Subdivision\4.CADD\#ACAD\1.RAL\#23539_CI_RAL.dwg
E
8 LOT USAGE AND CONTAIN WORKS WITHIN THE SUBJECT LOT.
90 SP324164 FINAL CONFIGURATION TO BE DETERMINED DURING OPW PHASE.
NOM
R
1:4
NOM
90
1:4
W
S
E
H0.0
H1.4
91
R
LOT 3 LOT 4 LOT 5 LOT 6
PROVIDE DN150 STUB TO THE BOUNDARY TO
1:3* MAX
C
VARIES
W
S
AFFORD #35 PAVILION STREET PROVISION FOR
LOT 5 ACCESS VEHICLE SWEPT PATH
E
91 SK103
ROOFWATER CONNECTION. FUTURE PIT BY OTHERS.
NOM
NOM
91
1:3
1:3
STANDARDS AUSTRALIA MEDIUM RIGID VEHICLE SCALE 1:200
R
REFER DRAWING 23539-SK102 FOR CONTINUATION
COPYRIGHT © Associated Consultants Client Drawn Verified Project Drawing Title Scale Sheet Size
JF JF
This drawing is subject to
copyright in accordance with
SURVEYORS & PLANNERS PSP DEVELOPMENTS P/L 'POMONA 33' : RESIDENTIAL DEVELOPMENT ENGINEERING PLAN 1 : 250 U.N.O. A1
the agreement between TOD LAND SURVEYING DYNAMICS (LSD) Designed Verified
Consulting Pty Ltd (tc) and tc's E 07.04.25 LOT 7 & LOT 8 EARTHWORKS JF
p 0412 666 516 JF JF 33 PAVILION ST, POMONA SHEET 1 OF 2 Drawing Number
client. This drawing shall only D 19.12.23 RAL23/0013 PRELIM APPROVAL AMENDMENTS JF
be used for this specific project.
C 17.11.23 RAL23/0013 IR RESPONSE FURTHER ADVICE JF
e [email protected] Approved RPEQ No RP DESCRIPTION 4 / RP809059 23539-SK101
This drawing shall not be used w www.landsurveyingdynamics.com Noosa: 07 5449 9600 Sunshine Coast: 07 5329 3190 LOCAL AUTHORITY NOOSA COUNCIL
B 06.10.23 RAL23/0013 IR RESPONSE JF MCU APPROVAL - HORIZ DATUM MGA 2020 0 10 20 30 40 50 60 Sheet Revision
for construction until marked as PO Box 61, Noosaville, QLD 4566 Signed
A 18.07.23 ORIGINAL ISSUE JF [email protected] www.todconsulting.com ROL APPROVAL - VERT DATUM AHD
'Issued For Construction' in the
revision description. Rev Date Revision Description Drawn ABN 39 128 805 336 OPW APPROVAL - RL DATUM - MEASUREMENT BAR - INCREMENTS IN mm E
Section 7
MAJESTI
REFER DRAWING 23539-SK101 FOR CONTINUATION
2 3 4 6 7
R
3m WIDE CONC. ACCESS FOR LOT 5
E
W
89
E
LEGEND
S
EXISTING CONTOURS (0.5m INTERVALS)
R
89 INTERIM 1.5m STORMWATER EASEMENT (STAGE 1) PROPOSED CONTOURS (0.5m INTERVALS)
89
TO BE EXTINGUISHED IN STAGE 2
E
EXISTING KERB & CHANNEL
EXISTING DRAINAGE
R
90 S EXISTING SEWER
W
S
COMBINED RETAINING WALL / BATTER INTERFACE TO OPTIMISE W EXISTING WATER
E
8 LOT USAGE AND CONTAIN WORKS WITHIN THE SUBJECT LOT.
PROPOSED KERB & CHANNEL
90 SP324164 FINAL CONFIGURATION TO BE DETERMINED DURING OPW PHASE.
NOM
R
PROPOSED STORMWATER DRAINAGE
1:4
NOM
90
1:4
W
S
R PROPOSED ROOFWATER DRAINAGE
E
H0.0
H1.4
S PROPOSED SEWER
91 W PROPOSED WATER
R
PROVIDE DN150 STUB TO THE BOUNDARY TO
1:3* MAX
C PROPOSED TOP OF BATTER
VARIES
W
S
AFFORD #35 PAVILION STREET PROVISION FOR
E
91 SK103 PROPOSED TOE OF BATTER
ROOFWATER CONNECTION. FUTURE PIT BY OTHERS.
NOM
NOM
91
1:3
1:3
PROPOSED RETAINING WALL
R
W H1.0 PROPOSED RETAINING WALL HEIGHT
E
S
92 PROPOSED ROAD PAVEMENT
SC H0.0 F
R R H1.3 PROPOSED CONCRETE PATHWAY
SC R
R R SK103 PROPOSED CONCRETE DRIVEWAY
S 92 S S S
E
92 S S S PROPOSED EARTHWORKS
W
A VARIES B CUT FILL
R
SK103 SK103
S
93 1:7 MAX
E
BATTER SLOPE MANAGEMENT
W
R
93 < 1 : 4 SLOPES SHALL BE GRASSED
S
93
H0.0 1 : 3 SLOPES SHALL BE PLANTED*
E
H0.0 1 : 2 SLOPES SHALL CONSIST OF LEVEL 1 FILL WITH PLANTING*
1:100
NOM
W
R
* PLANTING DETAILS TO BE DETERMINED DURING OPW PHASE
5
E
94
S
EXISTING (#35)
VARIES
DWELLING TO 3
R
W
94 94 1:4 MAX
BE RETAINED RP809059
NOOSA COUNCIL
1
S
9 REFERENCE DOCUMENT
R
SP324164
W
E
95 RAL23/0013.02 30 MAY 2025
S H1.3
R
95 95
2
E
W
NOM
1:3
LOT 5 RP864877
EXISTING SEWER AND WATER
S
H0.0
R
E
CONNECTIONS SERVICING LOT 1
E
TO BE RETAINED
W
96
PLACE
7m
E
R
S
E
96 96
2
E
W
S S S S S
ENTRY MANOEUVRE 3
E
E
MAJESTIC
PROVIDE DN150 STUB TO THE BOUNDARY TO AFFORD
#29 & #31 PAVILION ST PROVISION FOR ROOFWATER EXIT MANOEUVRE
CONNECTION. FUTURE PITS BY OTHERS.
E
W
97 97
E
W
1
E
LOT 6 LOT 7
EXISTING ACCESS TO LOT 1 TO BE RETAINED
W
LOT 1 ACCESS VEHICLE SWEPT PATH LOT 7 ACCESS VEHICLE SWEPT PATH
E
(#29) (#31) STANDARDS AUSTRALIA B99 VEHICLE SCALE 1:200 STANDARDS AUSTRALIA B99 VEHICLE (FWD-IN : REV-OUT) SCALE 1:200
EMT A RP809059
98 98 6 5
W
(#27A) RP809059 RP809059
E
1 (#37)
RP189023 2 1 4 3
RP809059 RP154922 2
RP864877 RP864877
W
E
CONSTRUCT 4m x 0.9m CONCRETE
BIN PAD IN FAVOUR OF LOTS 6 & 7
W
E
99 99
1
E
W
3
J:\2023\23539SD2_33 Pavilion St, Pomona - Subdivision\4.CADD\#ACAD\1.RAL\#23539_CI_RAL.dwg
E
W
100 100
E
E E E E
LOT 4 LOT 5 LOT 6 LOT 7
PAVILION STREET
E
TURNING FACILITY VEHICLE SWEPT PATH
STANDARDS AUSTRALIA MEDIUM RIGID VEHICLE (3-POINT TURN) SCALE 1:200
COPYRIGHT © Associated Consultants Client Drawn Verified Project Drawing Title Scale Sheet Size
JF JF
This drawing is subject to
copyright in accordance with
SURVEYORS & PLANNERS PSP DEVELOPMENTS P/L 'POMONA 33' : RESIDENTIAL DEVELOPMENT ENGINEERING PLAN 1 : 250 U.N.O. A1
the agreement between TOD LAND SURVEYING DYNAMICS (LSD) Designed Verified
Consulting Pty Ltd (tc) and tc's E 07.04.25 LOT 7 EARTHWORKS JF
p 0412 666 516 JF JF 33 PAVILION ST, POMONA SHEET 2 OF 2 Drawing Number
client. This drawing shall only D 19.12.23 RAL23/0013 PRELIM APPROVAL AMENDMENTS JF
be used for this specific project.
C 17.11.23 RAL23/0013 IR RESPONSE FURTHER ADVICE JF
e [email protected] Approved RPEQ No RP DESCRIPTION 4 / RP809059 23539-SK102
This drawing shall not be used w www.landsurveyingdynamics.com Noosa: 07 5449 9600 Sunshine Coast: 07 5329 3190 LOCAL AUTHORITY NOOSA COUNCIL
B 06.10.23 RAL23/0013 IR RESPONSE JF MCU APPROVAL - HORIZ DATUM MGA 2020 0 10 20 30 40 50 60 Sheet Revision
for construction until marked as PO Box 61, Noosaville, QLD 4566 Signed
A 18.07.23 ORIGINAL ISSUE JF [email protected] www.todconsulting.com ROL APPROVAL - VERT DATUM AHD
'Issued For Construction' in the
revision description. Rev Date Revision Description Drawn ABN 39 128 805 336 OPW APPROVAL - RL DATUM - MEASUREMENT BAR - INCREMENTS IN mm E
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J:\2023\23539SD2_33 Pavilion St, Pomona - Subdivision\4.CADD\#ACAD\1.RAL\#23539_CI_RAL.dwg
NATURAL SURFACE
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NOOSA COUNCIL
SECTION E SECTION F
REFERENCE DOCUMENT
SK101 SK102
RAL23/0013.02 30 MAY 2025
COPYRIGHT © Associated Consultants Client Drawn Verified Project Drawing Title Scale Sheet Size
JF JF
This drawing is subject to
copyright in accordance with
SURVEYORS & PLANNERS PSP DEVELOPMENTS P/L 'POMONA 33' : RESIDENTIAL DEVELOPMENT SITE CROSS SECTIONS 1 : 100 U.N.O. A1
the agreement between TOD LAND SURVEYING DYNAMICS (LSD) Designed Verified
Consulting Pty Ltd (tc) and tc's E 07.04.25 SECTIONS C, D & E UPDATED JF
p 0412 666 516 JF JF 33 PAVILION ST, POMONA Drawing Number
client. This drawing shall only D - - -
be used for this specific project.
C 07.04.25 LOT 7 & LOT 8 EARTHWORKS JF
e [email protected] Approved RPEQ No RP DESCRIPTION 4 / RP809059 23539-SK103
This drawing shall not be used w www.landsurveyingdynamics.com Noosa: 07 5449 9600 Sunshine Coast: 07 5329 3190 LOCAL AUTHORITY NOOSA COUNCIL
B 19.12.23 RAL23/0013 PRELIM APPROVAL AMENDMENTS JF MCU APPROVAL - HORIZ DATUM MGA 2020 0 10 20 30 40 50 60 Sheet Revision
for construction until marked as PO Box 61, Noosaville, QLD 4566 Signed
A 17.11.23 ORIG. ISSUE (RAL23/0013 IR FURTHER ADVICE) JF [email protected] www.todconsulting.com ROL APPROVAL - VERT DATUM AHD
'Issued For Construction' in the
revision description. Rev Date Revision Description Drawn ABN 39 128 805 336 OPW APPROVAL - RL DATUM - MEASUREMENT BAR - INCREMENTS IN mm E
Section 9
33 Pavilion Street, Pomona
PSP Developments Pty Ltd
Flood and Stormwater Management Plan
23-0167SMP01-V3
November 2023
NOOSA COUNCIL
REFERENCE DOCUMENT
RAL23/0013.02 30 MAY 2025
Section 10
Commercial in Confidence
This document is commercial-in-confidence. The recipient of this document agrees to hold all information presented
within as confidential and agree not to use or disclose or allow to use or disclosure of the said information to
unauthorized parties, directly or indirectly, irrespective of the acceptance or rejection of the presentation or at any time
before, during or after an agreement has been reached, without prior written consent.
This report is prepared by Colliers | Engineering & Design for exclusive use by its client only. No responsibility is accepted
for the use of or reliance upon this report in whole or in part by any third party.
Limitations
The sole purpose of this report and the associated services performed by Colliers | Engineering & Design is to display
information in accordance with the scope of services set out in the contract/quotation between Colliers | Engineering &
Design and its client. The scope of works and services were defined by the requests of the client, by the time and
budgetary constraints imposed by the client, and by the availability of access to site/s and information.
This report is prepared with information supplied by the client and possibly others which is presumed to be accurate and
complete. No responsibility is accepted for information that is withheld, incorrect or that is inaccurate, nor for changes
to the conditions over the passage of time or from latent circumstance or conditions. No warranty or guarantee is made
in relation to the data, findings and conclusions expressed in this report.
This report has been compiled at the level of detail specified in the report and no responsibility is accepted for
interpretations made at more detailed levels than so indicated.
Report Contact:
Name: Lochlan Gillis
Position Senior Water Resources Engineer
Phone: (07) 3532 1300
Document Control
21-0352FSMP02-V3
Version Date Details Prepared Checked Approved Signed RPEQ
1 18/07/2023 Issue BB / LG LG KM 09298
2 06/10/2023 Issue LG KM KM 09298
3 15/11/2023 Issue LG KM KM 09298
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page i
Section 11
Executive Summary Colliers Engineering and Design have been engaged by PSP Developments Pty Ltd to prepare a Stormwater Management Plan (SMP) in support of a development application to Noosa Shire Council (NSC) over land located at 33 Pavilion Street, Pomona (Lot 4 RP809059). This development application seeks a development permit for a Reconfiguration a Lot (ROL) to create 8 residential lots. The site has an existing building at Lot 1 and no works are required to create lot 1. The location of the proposed development site has a total land holdings area covering 3.33ha. The site is consistent with a rural residential land use type with some wooded vegetation cover over the site. The site is accessed by Pavilion Street to the east and Majestic Place to the south and is bounded by private allotments to the north, east and south. Cooroora Creek is located in the adjacent property to the west. It can be seen from the results presented that the treatment measures proposed for the development site achieve the performance criteria set by the NSC Planning Scheme (2020) and SPP (July 2017). Annual Load Reductions of Total Suspended Solids (TSS), Total Phosphorus (TP), Total Nitrogen (TN) and Gross Pollutants (GP) between the Mitigated and Unmitigated Scenarios have been achieved through the upgrade of the existing bioretention basin from 80m2 to 130m2. It has been demonstrated that non-worsening of peak flows has been achieved to the discharge point for events up to the 1% AEP event. The results show that there is non-worsening for events up the 1% AEP. The intent of sizing the detention basin is to mitigate flows up to the 10% AEP storm event to ensure non-worsening of discharges into the downstream flow path. In larger events, flows from the site will start to sheet flow across the rear of the site to Cooroora Creek. As the discharge point for the site becomes inundated from Cooroora Creek flooding in the major storm event, it is considered non-worsening has been achieved. The catchment size of Cooroora Creek reporting past the site is approximately 1,400 ha and it is considered that no quantifiable change to downstream flooding conditions would result. The development Is located above ”he r’Iional 1% (2100) AEP flood extent with 500mm freeboard recommended to future dwellings on the new allotments. 23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona
Section 12
Table of Contents
Executive Summary ................................................................................ 2
1. Introduction ..................................................................................... 6
1.1 Site Characteristics ................................................................................ 6
1.1. Flood Overlay ......................................................................................... 7
1.2. Lawful Point of Discharge .................................................................... 8
1.3. Request for Information ....................................................................... 9
Item 10: Issue – Earthworks ..............................................................................9
Item 11 9
Item: Flood impact assessment ........................................................................9
Item 16 / 17 ...................................................................................................... 10
Items – 8 - 20.................................................................................................... 10
Item 21 11
Item 23 / 24 ...................................................................................................... 12
1.4. Further Advice ..................................................................................... 13
Issue - Stormwater Quality ............................................................................. 13
Information Request........................................................................................ 14
Detention Basin ................................................................................................ 15
2. STORMWATER QUANTITY.............................................................. 18
2.1. Hydrologic Assessment ...................................................................... 18
2.1.1. Existing Scenario .............................................................................. 18
2.1.2. Rational Method Check ................................................................... 19
2.1.3. Developed Scenario ......................................................................... 21
2.1.4. Mitigation Scenario.......................................................................... 23
2.2. Flood Investigation .............................................................................. 25
2.2.1. Flood Model ...................................................................................... 25
2.2.2. Existing Scenario (E05) .................................................................... 25
2.2.3. Proposed Scenario (P06)................................................................. 25
2.2.4. Afflux .................................................................................................. 25
2.2.5. Peak Flow .......................................................................................... 26
2.2.6. Flood Storage ................................................................................... 26
2.2.7. Flood Immunity ................................................................................ 27
3. STORMWATER QUALITY ................................................................ 29
3.1. Design Objectives ................................................................................ 29
3.2. Stormwater Quality Treatment ......................................................... 29
3.2.1. Strategy ............................................................................................. 29
3.2.2. MUSIC Parameters........................................................................... 29
3.2.3. Catchment Areas .............................................................................. 30
3.2.4. MUSIC Model Layout ....................................................................... 31
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona
Section 13
3.3. Treatment Measures .......................................................................... 32
3.3.1. Bioretention System ......................................................................... 32
3.3.2. Sediment Forebays .......................................................................... 33
3.4. Results .................................................................................................. 33
4. CONSTRUCTION PHASE MANAGEMENT ...................................... 35
4.1. Erosion and Sediment Control .......................................................... 35
5. ESTABLISHMENT AND OPERATIONAL PHASE
MANAGEMENT ............................................................................... 36
5.1. Establishment ...................................................................................... 36
5.2. Operational .......................................................................................... 36
6. CONCLUSION .................................................................................. 37
7. REFERENCES.................................................................................... 38
List of Tables
Table 1-1: Reformatted MUSIC results ........................................................ 14
Table 2-7: Pavilion St Road capacity calculation using Manning’s’
equation .......................................................................................................... 17
Table 2-1: Summary of Existing Catchment Parameters .......................... 19
Table 2-2: Existing Catchment Peak Flows .................................................. 19
Table 2-3: Comparison of WBNM and Rational Method Peak Flows –
SUB3 ................................................................................................................ 21
Table 2-4: External catchment overland flow (entering site) and pipe
flow (diverted around site via Pavilion St)................................................... 22
Table 2-5: Summary of Developed Catchment Parameters ..................... 22
Table 2-6: Comparison of Peak Flows At Site Outlet (Existing Vs.
Developed)...................................................................................................... 22
Table 2-7: Summary of Basin Structure Details ......................................... 23
Table 2-8: Comparison of Peak Flows (Existing Vs. Mitigated) ................. 24
Table 2-9: Comparison of 1% AEP event across all durations (Existing
Vs. Mitigated) .................................................................................................. 24
Table 2-10: Existing and Proposed Peak discharge at the Site
Boundary. ....................................................................................................... 26
Table 2-11: 1% AEP Flood Storage Comparison. ........................................ 26
Table 2-12: Lot Levels Compared to Adjacent 1% AEP Peak Flood
Levels............................................................................................................... 27
Table 3-1: Site Stormwater Quality Objectives (Operational Phase) ....... 29
Table 3-2: Urban land use (Split Source Nodes) - Pollutant Export
Parameters ..................................................................................................... 30
Table 3-3: MUSIC Runoff Generation Parameters ..................................... 30
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona
Section 14
Table 3-4: Catchment Areas ......................................................................... 30
Table 3-5: Bioretention Design Parameters ............................................... 33
Table 3-6: Sediment Forebay Design Parameters...................................... 33
Table 3-7: MUSIC Results – Load Based Pollutant Outputs ...................... 33
Table 3-8: MUSIC Results – Portion of total pollutant loads for External
Catchment and Site ....................................................................................... 34
List of Figures
Figure 1-1: Site Location .................................................................................. 7
Figure 1-2: Overland Flow Paths and Flood Hazard Overlay Mapping
(2019 Aerial)...................................................................................................... 8
Figure 1-3: The development site (current and original developments)
source loads from the MUSIC model .......................................................... 14
Figure 1-4: Moderate Flood Extent (Source: Noosa Council Disaster
Mapping) ......................................................................................................... 16
Figure 1-4: Pavilion St Road Cross-Section ................................................. 17
Figure 2-1: Existing Catchment Delineation................................................ 18
Figure 2-2: Developed Catchment Delineation .......................................... 21
Figure 2-3: Proposed cut / fill areas and extent of 1% AEP (CC) flood
level ................................................................................................................. 27
Figure 2-4: 1% (2100) AEP Peak Water Surface Elevation Reporting
Locations ......................................................................................................... 28
Figure 3-1: WSUD Catchment Locality Plan ................................................ 31
Figure 3-2: MUSIC Model Layout .................................................................. 32
Appendices
Reconfiguration of Lot Plan and Concept Engineering
Rational Method and WBNM Output
Existing Flood Map
Proposed Flood Map
Flood Afflux Map
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona
Section 15
1. Introduction
Colliers Engineering and Design have been engaged by PSP Developments Pty Ltd to prepare a Stormwater
Management Plan (SMP) in support of a development application to Noosa Shire Council (NSC) over land
located at 33 Pavilion Street, Pomona (Lot 4 RP809059). This development application seeks a development
permit for a Reconfiguration a Lot (ROL) to create 8 residential lots. The site has an existing building at Lot 1
and no works are required to create lot 1.
The proposed outcome of this document is to identify stormwater management options that could be
implemented within the development in order to achieve the requirements and targets of NSC Planning
Scheme “Water Quality and Drainage Code” as well as the relevant provisions of State Planning Policy (SPP
2017). The intent of the codes associated with these documents will be achieved through the appropriate
integration of stormwater management options within the proposed residential land-use. The objectives of
this Stormwater Management Plan are to:
Detail the proposed stormwater quality management strategy and how the load reduction
objectives specified by the State Planning Policy (SPP, DSDIP 2017) and NSC Planning Scheme are
achieved during the operational phase of the development;
Consider suitable Stormwater Quality Improvement Devices (SQID’s) based on Water Sensitive
Urban Design (WSUD) principles;
Outline the maintenance requirements for the proposed stormwater quality improvement
devices;
Ensure the development achieves non-worsening of stormwater flows downstream of the site;
and
Demonstrate how the lawful point of discharge requirements for the site will be achieved.
Demonstrate development is located outside of Flood Hazard Overlay Mapping.
The proposed development layout and preliminary engineering drawings is provided in Appendix A.
1.1 Site Characteristics
The location of the proposed development site is shown in Figure 1-1, with a total land holdings area
covering 3.33ha. The site is consistent with a rural residential land use type with some wooded vegetation
cover over the site. The site is accessed by Pavilion Street to the east and Majestic Place to the south and is
bounded by private allotments to the north, east and south. Cooroora Creek is located in the adjacent
property to the west.
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page 6
Section 16
SITE Figure 1-1: Site Location 1.1. Flood Overlay The rear of the site is partially influenced by flooding from Cooroora Creek, which is located to the west of the property. The inundation extent identified in the Flood Hazard Overlay is highlighted in Figure 1-2. 23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page 7
Section 17
Figure 1-2: Overland Flow Paths and Flood Hazard Overlay Mapping (2019 Aerial)
1.2. Lawful Point of Discharge
As outlined by the Queensland Urban Drainage Manual (4th Edition – Institute of Public Works Engineering
Australasia, Queensland Division) a test can be undertaken to determine whether a lawful point of
discharge exists:
The criteria for determining the lawful point of discharge are:
(i) Will the proposed development alter the site’s stormwater discharge characteristics in a manner
that may substantially damage a third-party property (see Section 3.6)?
If not, then no further steps are required to obtain tenure for a lawful point of discharge
(assuming any previous circumstances and changes were lawful).
It is proposed that discharge of runoff from the proposed development site will be maintained to the
property boundary within the mapped waterway.
It is considered that discharge from the site will be managed in such a manner as to not substantially
damage third party property, and as a result it is considered suitable lawful points of discharge has been
identified and achieved.
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page 8
Section 18
1.3. Request for Information
An information request from Noosa Council, dated 15 August 2023, requested further information on the
development application (RAL23/0013). Items relevant to the Flood Investigation and Stormwater
Management Plan are listed below together with the relevant response(s).
Item 10: Issue – Earthworks
Section 2.2.1 of Collier’s Flood and Stormwater Plan proposes the following:
a. A drain at a depth of 0.4m in a 3-metre-wide easement; and
b. 1,250m of cut at a depth of 0.1m.
Insufficient information has been provided demonstrating the location and extent of these works. Any works that
is located outside of the subject site (33 Pavilion Street) must be supported with the landowners’ written consent.
Response:
The earthworks (drain in 3mtr easement, and 1250m3 cut) are part of 25 Pavilion works and have been
constructed.
Section 2.2.1 of the SMP has been updated to show the works as “existing” to clarify this point.
Item 11
Provide additional detail demonstrating the location and extent of the works proposed in Section 2.2.1 of Collier’s
Flood and Stormwater Plan. The additional detail must be prepared by a suitably qualified person (RPEQ –
Registered Professional Engineer of Queensland) and include, but not be limited to:
a. details of the proposed stormwater drain and easement (location, grades, lots benefitted and burdened);
and
b. where works are located outside of the subject site (33 Pavilion Street), provide all respective landowners’
written consent.
Response:
The stormwater drain and easement are not proposed works. They are existing works as part of adjoining
application 25 Pavilion. Section 2.2.1 SMP has been updated to clarify this point.
Item: Flood impact assessment
The submitted Flood and Stormwater Plan prepared by Colliers includes aerial imagery that does not reflect the
recent subdivision at 25 Pavilion Street (now Majestic Drive). It is unclear to Council if survey data reflecting the
newly completed works has been used in conjunction with Lidar to provide an accurate assessment of the
proposed flood and afflux mapping. Council is concerned that the proposed earthworks may adversely affect the
flood characteristics of external sites.
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page 9
Section 19
Response:
Note: Afflux mapping has been updated since V1 of the report as follows:
existing scenario has been revised from E03 to E04,
proposed scenario has been revised from P04 to P06.
The existing scenario (E04) includes:
site survey of 25 Pavilion St, Pomona, prior to development works.
a design surface of the engineering design at 25 Pavilion St, Pomona
SMP-V2 has figures updated with aerial imagery that reflects the recent subdivision at 25 Pavilion Street
(now Majestic Drive), showing the subdivision has been considered in the existing scenario.
Item 16 / 17
16. Provide additional comment detailing that the submitted Flood Investigation has been conducted using recent
survey data of the completed works along 25 Pavilion Street (now Majestic Drive).
17. Alternatively, provide an amended Flood Investigation th tilizesses recent survey data in conjunction with
Lidar to more accurately assess the impacts the proposed subdivision works will have on flood depths on external
sites. The amended Flood Investigation must be prepared by a suitably qualified person (RPEQ – Registered
Professional Engineer of Queensland).
Response:
The flood investigation has conducted using the design surface supplied by TOD consulting, which 25
Pavilion St has been constructed to, and is considered of sufficient accuracy for the purpose of the flood
investigation.
Items – 8 - 20
Provide an updated flood impact assessment and proposal plans which address the following:
18. Provide updated proposal plans which show drainage easement overall balance areas of Lot 9 which will
remain below the 1%AEP (2100) flood level
19. Amend the earthworks design for Lots 8 and 9 such that there is no net loss of floodplainstorage (e.g. provide
partial retaining)
20. Provide an additional flood afflux map showing the impacts associated with this development only (i.e. not
combined impacts with 25 Pavilion St development).
Response:
18. Figure 2-3 in the report has been added to clarify proposed cut and fill areas in relation to the 1% AEP
(Climate change) flood level/
19. Updated
20. Afflux map updated (E05 vs P06) – Refer SMP-V2 Appendix E.
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page 10
Section 20
Item 21
Issue: Storage sizing does not appear to be in accordance with QUDM and ARR2019.
Information Request
21. Provide revised sizing/modelling and associated engineering drawings and reporting for the detention storage
proposed for the development site, which achieves the following:
a. Is undertaken using the ensemble storms approach of ARR2019
b. The detention storage volume of ~200m3/ha (of development) is considered low for this type of land use
change. The pervious initial loss reported in the SWMP appears to be much lower than the
recommendations of either QUDM or ARR2019 and is likely to result in under-sizing of the detention
storage due to an over-estimate of the pre-development peak flows. Justify the assumed initial loss or
adopt a revised value consistent with QUDM and ARR2019
c. Provide a copy of the WBNM model for review
d. Update the basin design to ensure the freeboard requirements of QUDM are achieved for the 1%AEP
(2100) event. The proposed freeboard of 50mm is not acceptable as it presents an unacceptable risk of
embankment overtopping and failure
e. Demonstrate no increase in peak flows for all events up to and including the 1%AEP (2100) event, for the
range of durations applicable to the downstream land, not just the critical duration at the site boundary.
f. Explanation is required for why the 1%AEP (2100) peak flow is predicted to decrease in Table 2-5 rather
than increase following development?
g. Are Tables 2-1 and 2-2 meant to refer to Sub3 rather than Sub1 (the neighbouring site)?
h. The SWMP makes a number of assumptions regarding contribution of flows from East of Pavilion St,
without justifying how this has been quantified. Calculations supporting the estimated conveyance
capacity of Pavilion St are requested.
Response:
21. Figure 2-3 in the report has been added to clarify proposed cut and fill areas in relation to the 1% AEP
(Climate change) flood level/
a. iWBNM Lite (2019 version) ultilised, which applies ARR2019 with ensemble storms.
b. IL revised to 35mm and CL revised to 2.4 mm/hr in line with ARR2019 datahub values.
c. Files will be supplied to Council as requested.
d. The updated basin achieves a freeboard of 0.19m. This improves upon the existing approved
freeboard (0.14m) currently provided within the basin for 25 Pavilion St, Pomona, as per
Stormwater Management Plan 21-066-SMP02-V1.
The augmented basin design has considered flood storage area within the flood overlay, and has
limited fill to achieve a balance between providing basin capacity, and achieving flood storage area.
As the basin has capacity to contain the 1% AEP (climate change) in the fully blocked case, it is
considered that the basin design satisfies the multiple objectives at the site.
e. Refer Table 2-9 for a summary of peak mitigated flows for the 1% AEP event across all storm
durations. The analysis demonstrates non-worsening has been achieved across a range of
durations.
f. Table updated.
g. Tables updated.
h. Table 2-4 has been provided to qualify the contribution of flows from catchments Ex1 and Ex2 east
of Pavilion St, demonstrating the portion of 10% AEP pipe flow diverted around the site and the
portion of overland flow that tops Pavilion St and enters the site.
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page 11
Section 21
Item 23 / 24 Iss–e - Stormwater Quality It is unclear how compliance with the pollutant load reduction targets have been calculated. The development source node unmitigated loads should be factored by the required pollutant reduction percentages and then compared to the results from the model. It is unclear if this has been done. Information Request: 23. Provide a copy of the MUSIC model. 24. Provide further reporting of results which shows: the unmitigated loads from the development site(s) nodes only, the required load reductions (kg/yr) from the development site loads in order to meet the targets, and the mitigated results at the receiving node. Response: 24. Calculations for mitigated loads are shown in Table 3-8, demonstrating that the bioretention basin meets the target reductions for the development site. 23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page 12
Section 22
1.4. Further Advice
Further advice was received from Noosa Council, dated 7 November 2023, regarding the development
application (RAL23/0013). The further advice letter asks for the proposal to comply with the Noosa Plan for
stormwater items listed below.
Issue - Stormwater Quality
It is unclear how compliance with the pollutant load reduction targets has been calculated. The scheme requires
an 80%/60%/45% reduction in TSS/TP/TN for the unmitigated development site loads. Since the bioretention
device receives flows from areas outside the development, a manual calculation of compliance with this target is
required, based on the MUSIC model results.
This is achieved by:
1. Extracting the development site (current and original developments) source loads from the model
2. Calculating the required pollutant load removal by multiplying (1) by 80%/60%/45%
3. Comparing the required load removal (kg/yr) to the actual load removal achieved by the device
This does not appear to have been done.
Response:
The SMP demonstrates an 80%/60%/45% reduction in TSS/TP/TN for the unmitigated development site
loads according to the scheme as summarized in Table 3-7 and Table 3-8.
The information provided in the SMP-V2 has been reformatted as per the above request:
1. The source loads of the current and original developments were extracted from the model (refer
Figure 1-3) and are summarized in the “Unmitigated (kg/yr)” column of Table 1-1.
Note that there is a minor difference between Figure 1-3 and Table 3-7 as MUSIC is a stochastic model, with
randomness resulting in minor changes in results between model runs.
2. The required pollutant load removal (2) was calculated by multiplying (1) by 80%/60%/45%. This
information is provided in Table 1-1.
3. The actual load removal (3) achieved by the device exceeds the required load removal (2) and therefore
meets the target reductions as per the scheme.
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page 13
Section 23
Figure 1-3: The development site (current and original developments) source loads from the MUSIC model
Table 1-1: Reformatted MUSIC results
(1) (2)
Development Required (3)
site pollutant load Target Total load Reduction
Pollutant Compliance
unmitigated removal for Reduction removal by Achieved (%)
source load development device (kg/yr)
(kg/yr) (kg/yr)
TSS 4,650 3,720 80% 3750 81%
TP 9.29 5.6 60% 6.9 74%
TN 51.6 23.2 45% 27 53%
GP 485 437 90% 638 100%
Information Request
Provide a copy of the MUSIC model and/or updated reporting addressing the above.
MUSIC results are as per model supplied with SMP-V2.
23-0167SMP01-V3 | Stormwater Management Plan | 33 Pavilion Street, Pomona Page 14
Section 24
Detention Basin
Detention Basin - storage sizing does not appear to be in accordance with QUDM and ARR2019.
Information Request
1) Provide revised sizing/modeling and associated engineering drawings and reporting for the detention storage
proposed for the development site, which addresses the following:
a) The response states that the initial losses have increased, however page 14 of the SWMP states that the
losses are unchanged. This needs to be resolved.
b) Provide a copy of the WBNM model for review
c) The results provided in Appendix B show peak flows increasing for a number of event frequencies and
durations. Demonstrate no increase in peak flows for all events up to and including the 1%AEP (2100)
event, for the range of durations applicable to the downstream land, not just the critical duration at the
site boundary
d) The external catchment areas stated in the existing case (Table 2-1) and developed case (Table 2-5) are
significantly different. There does not seem to be any valid reason for this. Sub3 and Sub4 also change
between tables, though these are within the site and this change may be due to physical changes. Justify
or resolve these differences and provide a ‘developed’ catchment plan where significant differences to the
existing case do exist.
e) Provide calculations quantifying the underground pipe and surface flow capacity of Pavilion St, in order
to demonstrate that the assumptions made in relation to the amount of external catchment flow which
enters the site are valid.
Response:
a) This is a typographical error. Losses in Section 2.1.1 have been updated to reflect the existing
scenario WBNM model initial and continuing loss of 35mm and 2.4mm/hr, in line with ARR2019
datahub values.
b) Supplied with SMP-V3.
c) The basin design is based upon augmentation of an approved and constructed basin at 25 Pavilion
St with outlet structure modelled as constructed. Effort has been taken to develop a design that
mitigates peak flows back to pre-development flow rates whilst improving upon freeboard of the
approved basin, as per Council’s RFI item 21 (d), dated 15 August 2023. The design achieves both
objectives, demonstrating:
non-worsening has been achieved across the full range of durations for peak 1% AEP
event (Appendix B).
the critical peak flows for the mitigated scenario are below the peak existing scenario flow
rate across all storm events.
The basin discharges to the local overland flow path which is significant in cross section due to the
fact that it acts to also convey breakout flows from the regional system in events greater than a
moderate event (approximately equivalent to at 10% AEP event). The use of this area within both
sites is restricted by existing regional flood conditions across the sites.
While it is noted that there are minor increases in some duration events (not the critical event) with
a single AEP (as provided in Appendix B) the minor change in small, frequent and short duration
events will be of no consequence and will be unlikely to create impact on downstream properties.
The basin is located a sufficient distance from the downstream boundary that any minor change (in
the order of 200 L/s) will be spread and flow across the downstream boundary with no observable
impacts across the width of the significant flowpath.
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Section 25
In addition, the magnitude of the increases (change) in non-critical durations (pre-post) still remain
orders of magnitude below the 1% AEP peak flow for the regional event. For example, the 1% AEP
peak flow in the regional event is in the order of 300 m3/s and the greatest change across
equivalent duration within an AEP event is 0.22 m3/s, (approximately 0.07% of the regional 1% AEP
flow). Based on guidance provided in the Flooding and Stormwater Management
Guidelines (Sunshine Coast Council, 2020) policy this is argued to be an acceptable difference.
Therefore, the change in non-critical durations is considered not to be of any significant
consequence within the context of the overland flow path and will not results in nuisance or
damage the downstream property.
Based on the above, and that the proposed solution provides an improved performance outcome
above the current approved basin, it is considered that the proposed detention basin meets the
performance objectives of the Noosa Planning Scheme, the intent of the QUDM guidelines and is
analysed using ARR2019 methodology. As such it is considered that the basin design is sufficient to
meet the approval criteria of the application.
Figure 1-4: Moderate Flood Extent (Source: Noosa Council Disaster Mapping)
d) Across some storm durations there is a minor difference in flow rates above existing. These
differences are largely unobservable above 90 min, and resolved once the duration is greater than
270 min (4.5 hours):
e) Differences between external catchments have been corrected in Table 2-1 to reflect the existing
scenario WBNM model. There is no difference in the external catchment size modelled for the
existing and developed scenarios.
Differences between SUB3 and SUB4 reported in SMP are correct. This is due to grading within the
site adjusting catchment delineation. Refer to Figure 2-1 and Figure 2-2 for details.
The difference in catchment delineation between existing and developed scenarios does not
materially change the results of the model. This is because SUB3 is routed to SUB4, which connects
to the model outlet “SINK” in the existing scenario, bypassing sub-catchments SUB1 and SUB2. In
the proposed scenario SUB3 is routed to SUB1, where the basin structure is located, in alignment
with the engineering drawings for the proposed development (Appendix A). Refer Table 2-1 and
Table 2-5 for model routing.
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Section 26
f) The 10% AEP capacity of the road is as per the approved matches the approved SMP for the
adjacent developments at 25 Pavilion St, which states:
“Existing drainage capacity of Pavilion Street is approximately equivalent to the 10% AEP storm event,
with flow greater than this overtopping the verge and entering the site.”
This has intentionally been kept consistent between SMPs, and demonstrates that the proposed
augmented basin achieves greater storage and improved freeboard in comparison to the
approved SMP for 25 Pavilion St.
A road capacity calculation was completed to confirm this assumption using a cross section of the
road based on LIDAR data. Refer to Table 1-2 and Figure 1-5. Manning’s equation indicates that the
road has a road capacity (1.16 m3/s) greater than the 10% AEP flow rate from the external
catchments (0.437 m3/s for EX1 and 0.165 m3/s for EX2). Therefore, the assumption that Pavilion St has
capacity for 10% AEP flows is conservative, and freeboard within the basin is expected to be greater
than modelled.
Table 1-2: Pavilion St Road capacity calculation using Manning’s’ equation
Parameter Value Unit
Cross sectional area 1.24 m2
Channel slope 0.026 m/m
Wetter perimeter 11.21 m
Manning's (n) 0.04
Hydraulic radius (R) 0.1 m
Velocity 0.93 m/s
Froude Number 0.73
Flow rate (Q) 1.16 m3/s
Road Cross Section
0.2
0.18
0.16
0.14
0.12
Elevation (m)
0.1
0.08
0.06
0.04
0.02
0
0 2 4 6 8 10 12
Ground Level
Distance (m)
Water level
Figure 1-5: Pavilion St Road Cross-Section
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The text continues on section 27.