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Stormwater Management Plan 2/27 Ross Crescent, QLD, 4567 Arcos Project: 240572 [OCR of page images] Stormwater Management Plan 2/27 Ross Crescent, QLD, 4567 Arcos Project: 240572 M ARCOS
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Page 2
Attention: Peter Flavel 28 August 2024
C/- David Teeland – Sealand Architect Arcos Project: 240572
Report 01
By Email AG-240572-RPT-C-01
Stormwater Management Plan
2/27 Ross Crescent, Sunshine Beach,
QLD, 4567
Document Control
Version Date Details Prepared Checked Approved
0 28/08/24 For Approval JH GM LS
Principal Civil Engineer
Lachlan Swann B.Eng (Civ) (Hons), CPEng, RPEQ, NER, MIEAust
[email protected]
Arcos Group
E [email protected]
W arcosgroup.com.au
A 177C Brisbane Road, Mooloolaba, QLD, 4557
Page 3
ABN 51 640 311 842
CONTACT
arcosgroup.com.au
OFFICES
Sunshine Coast | Brisbane | Gold Coast
Contents
1.0 Introduction ................................................................................................................................ 4
2.0 Proposed Development.............................................................................................................. 4
3.0 Existing Drainage ....................................................................................................................... 5
4.0 External Catchments .................................................................................................................. 6
5.0 Flooding ..................................................................................................................................... 7
6.0 Lawful Point of Discharge .......................................................................................................... 7
7.0 Developed Case ......................................................................................................................... 7
7.1 Proposed System ....................................................................................................................... 7
7.2 Stormwater Quality Management .............................................................................................. 7
7.3 Stormwater Quantity Management ............................................................................................ 7
8.0 Conclusion ................................................................................................................................. 8
LIMITATIONS .......................................................................................................................................... 9
Appendix A – Stormwater Drawings & Calculations ............................................................................. 10
28 August 2024
Page 4
ABN 51 640 311 842
CONTACT
arcosgroup.com.au
OFFICES
Sunshine Coast | Brisbane | Gold Coast
1 Introduction
Arcos Unit Group Pty Ltd (Arcos) has been commissioned by Peter Flavel to prepare this Stormwater
Management Plan as part of a development application with Noosa Shire Council (NSC). The subject
site is described as Lot 2 on GTP100987 and has an area of 1,105m2. A site locality plan is presented
in Figure 1. The existing dwelling is located at 2 The Beach Houses - 2/27 Ross Crescent, Sunshine
Beach, Queensland.
FIGURE 1: SITE LOCALITY (SOURCE: NSC)
The subject site includes a large existing dwelling with a highset a garage. The site falls east towards
Sunshine Beach.
The property is located within the “Coastal area – erosion prone area” as noted in the SARA DA
mapping.
2 Proposed Development
It is proposed to renovate the existing dwelling. This renovation consists of the removal of the existing
garage, guest pavilion, entry decking and dilapidated roof section, and the construction of a new home
office, new garage, family room and new roof section. These proposed renovations are shown below in
Figure 2 and Figure 3.
28 August 2024
Page 5
ABN 51 640 311 842
CONTACT
arcosgroup.com.au
OFFICES
Sunshine Coast | Brisbane | Gold Coast
FIGURE 2: SITE PLAN (SOURCE: SEALAND ARCHITECTS)
FIGURE 3: EXISTING SITE PLAN (SOURCE: SEALAND ARCHITECTS)
3 Existing Drainage
There is no existing public stormwater network near the subject lot. Instead, the existing dwellings roof
runoff is captured and discharged to a rubble pit. This rubble pit is located downhill of the dwelling near
the lot’s eastern boundary, see Figure 4. The rubble pit sheet flows to the east towards Sunshine Beach
Park before reaching the beach itself.
28 August 2024
Page 6
ABN 51 640 311 842
CONTACT
arcosgroup.com.au
OFFICES
Sunshine Coast | Brisbane | Gold Coast
Existing rubble pit
FIGURE 4:EXISTING STORMWATER LAYOUT PLAN (SOURCE: SEALAND ARCHITECTS)
4 External Catchments
There is a small external catchment that flows through the existing site, refer contours in Figure 5
below. It is noted that the existing driveway would intersect majority of the external catchment and direct
flows to Ross Crescent.
FIGURE 5: CONTOURS (SOURCE: NSC)
28 August 2024
Page 7
ABN 51 640 311 842
CONTACT
arcosgroup.com.au
OFFICES
Sunshine Coast | Brisbane | Gold Coast
5 Flooding
The site is not identified as being impacted by flooding as per NSC Flood Hazard Mapping.
6 Lawful Point of Discharge
The lawful Point of Discharge (LPD) for the subject lot is the downslope eastern boundary of the site.
This lawful point of discharge is compliant with Section 3.9.1 requirements of QUDM.
7 Developed Case
7.1 Proposed System
It is proposed to reuse the existing rubble pit which had been sized for the existing dwelling and to install
a new second rubble pit for the new garage and new home office, refer to attached drawings in the
Appendix.
The roof area of the existing garage, guest pavilion and dilapidated roof section which are being
removed is of similar size to the proposed family room and new roof section (within 10m2). Therefore,
it is proposed to connect the roof area of the proposed family room to the existing stormwater downpipe
outlet and existing rubble pit.
The new garage and new home office are proposed to discharge to a new 2.4m long ‘Evertrench Large’
(or approved equivalent) stormwater disposal system. This rubble pit system has been sized in
accordance with the Moreton Bay Regional Council Stormwater for domestic buildings fact sheet. The
rubble pit has been positioned to avoid sheet flow being directed towards any buildings or structures.
Further, sizing was checked using additional industry adopted soak well design guidance.
7.2 Stormwater Quality Management
Stormwater quality measures do not apply for this development approval.
The State Planning Policy states that stormwater management design objectives do not apply for
premises smaller than 2500m2. This lot has an area of 1,105m2.
7.3 Stormwater Quantity Management
The minor increase of 56m2 in impervious area for this renovation does not require any stormwater
mitigation. The site is also located within 100m from Sunshine Beach. Detention is not required this
close to the ocean as it will not coincide with the peak flows in a storm event.
28 August 2024
Page 8
ABN 51 640 311 842
CONTACT
arcosgroup.com.au
OFFICES
Sunshine Coast | Brisbane | Gold Coast
8 Conclusion
This SWMP has been prepared to support the application on the proposed renovation at 2/27 Ross
Crescent.
Arcos confirms the following:
• The existing dwelling has a fully functional and operating rubble pit;
• The portion of the proposed renovation which is replacing the existing will reuse the existing
rubble pit;
• To manage roof runoff effectively, alleviating any scour potential to the sensitive coastal erosion
area the new garage and new office will discharge to a secondary rubble pit which has been
adequately sized and located;
• No stormwater quality or quantity measures are required for this renovation.
In summary, this report shows that the stormwater can be adequately managed for this renovation in
accordance with Council's code requirements.
28 August 2024
Page 9
ABN 51 640 311 842
CONTACT
arcosgroup.com.au
OFFICES
Sunshine Coast | Brisbane | Gold Coast
LIMITATIONS
Arcos Unit Group Pty Ltd (Arcos) has prepared this document for the project described on the title page
for the client's exclusive use. The document is specific to this particular project and for the purposes as
described within the document. The document cannot be used for any other project on the same site or
other sites or relied upon by a third party. Any party relying upon this document beyond its exclusive
use and purpose as stated above, and without the express written consent of Arcos, does so entirely
at its own risk and without recourse to Arcos for any loss or damage. Arcos has necessarily relied upon
information provided by the client and/or their agents.
The required detailed design for the service infrastructure will be subject to the conditions (if any),
attached to the Development Approval provided by Council and any nominated referral agencies.
The advice given in this document is based upon the assumed conditions and data outlined herein. The
relevance and accuracy of advice given are directly affected by variations in the information supplied
and open source information relied upon.
This document must be kept in its entirety, read in full and understood. Interpretations or conclusions
made by others unless supported by an expressed written statement, interpretation, outcome or stated
within this document cannot be the responsibility of Arcos.
This document or parts of it should not be used as part of a specification or design for a project without
prior review and agreement by Arcos.
28 August 2024
Page 10
ABN 51 640 311 842
CONTACT
arcosgroup.com.au
OFFICES
Sunshine Coast | Brisbane | Gold Coast
Appendix A – Stormwater Drawings &
Calculations
28 August 2024
Page 11
RUBBLE PIT CALCULATIONS
Arcos Group
Address: 2/27 Ross Crescent, Sunshine Beach
Job Number: 240572
Date: 14/08/2024
Engineer: JH
Calculations based off Moreton Bay Regional Council
Catchments:
Office 71.9 m2
New Garage 46.5 m2
Catchment Total 118.4 m2
Depth 0.5 m
Width 1m
Length 1 m per 50m2
Required length 2.4 m
Detail in link
Page 12
Stormwater for domestic buildings
The roof of every domestic building shall be provided with a complete and effective
drainage system to the satisfaction of the building certifier, which must ultimately comply
with the requirements of the Building Code of Australia.
The stormwater drainage must discharge to the kerb and channel (road frontage) where
a kerb adaptor has been provided by the developer at the time of the original subdivision;
or if the minimum pipe grade of 1:100 is achievable and adequate cover over that pipe
can be obtained. In this instance, the pipe shall be connected to the kerbing with an
approved galvanized mild steel kerb adaptor. The kerbing shall be “neatly” cut so the
kerb adaptor can be grouted into position and once in position it does not change the
profile of the kerbing.
Where there is an inter-allotment drainage network provided with an approved
connection point to receive the property’s stormwater drainage system then it must
discharge to that drainage network.
If there is no inter-allotment drainage network and the private stormwater drainage
system falls away from the street it must be discharged to an on-site stormwater
dispersion system.
An on-site dispersion system (rubble pit) must be placed so that it does not cause
stormwater to pond under the floor of any building; or to flood around the foundations of
any building; or cause nuisance to neighbouring properties.
Page 1 of 2 October 09
Page 13
Important:
There is no specific criteria relating to the placement of an on-site dispersion system (rubble
pit), however, it is suggested that it be placed a minimum of three (3) metres from any
boundary, building or structure. Where the land slopes toward the boundary this distance should
be increased accordingly.
The objective is to ensure there is no risk to the structural integrity of buildings and structures
and to achieve “sheet flow” at the property boundary. “Sheet flow” is the flow across a property
boundary that would have occurred naturally had there not been any building work at the
property.
Page 2 of 2 October 09
Page 14
18 16
ENGINEERS MARK UP
SWMP
23/08/2024 19
WALL LEGEND
ARCOS GROUP EXISTING WALL
JH NEW WALL
APPROX LOCATION OF
10.5m LONG EXISTING
20 RUBBLE PIT TO REMAIN PLAN LEGEND
180°
25' CB STRAMIT SHARPLINE
290w 38 rib MagnaFlow
17 DP SS DOWN PIPE
Existing Rock Retaining Wall 32.99
SITE EX EXISTING
BOU MB METER BOX
EXISTING NDA
RY SL VELUX SKY LIGHT
P O O L 18 SS 316 STAINLESS STEEL
ST STONE TILE
NEW RL RELATIVE LEVEL
POOL CB
21
DECK CB 19
CB INSTALL NEW 2.4m LONG X 1m WIDE X
EXISTING HOUSE CB
20 0.5m DEEP RUBBLE PIT. ENSURE NO
CB
STRUCTURES DOWNHILL. CONSTRUCT
CB 'EVERTRENCH LARGE' OR APPROVED
SL
CB CB 21
EQUIVALENT RUBBLE PIT SYSTEM IN
SL
EXISTING HOUSE CB ACCORDANCE WITH THEIR STANDARD
NEIGHBOURING HOUSE SL SL DETAILS.
NDAR
Y SL 22
CONNECT FAMILY ROOM ROOF
RY
23
22
NDA
BOU
DOWNPIPES TO EXISTING Wall
ock Retaining
Existing R
BOU
24
RUBBLE PIT DRAINAGE. THIS
SITE
NDER
SITE
AREA IS A SIMILAR SIZE TO WHAT
ALL U
35.26
IS EXISTING 25
NEW WORK
OF W
TO CONNECT
58'
75
'
89°39
INTO EXISTING
272°
33.8
FAMI 26
LINE
LYROO SERVICES
FALL
7.5 0 M NEIGHBOURING HOUSE
CB
27
NEW
2,000 ENTRY
SETB STAIR
ACK LINE OF WALL UNDER 28
NEW
GAR
FALL AGE NEW HOME OFFICE
15 0
CB FALL 250 CB
29
23 FALL 300
CB
30
SETB 2,500
ACK .
SETB
ACK
K
24 CONNECT NEW HOME OFFICE
BAC
EXISTING
.
1,400.
3,000
DRIVEWAY
25 31 AND NEW GARAGE ROOF
SET
BRICK 27 357°4
8'
31.04
3
AREAS TO NEW RUBBLE PIT
SITE
26 28 BOUN
29 DARY
30
SITE PLAN
1:200 scale
0 1 5 10m DESIGN DEVELOPMENT ISSUE
COMPLIANCE: All works to comply with Australian Standards,Queensland and National Client Project Amendment List Drawing Title
E
Construction Code requirements. Flavel Alterations & Additions DD1 Development Application Client Issue 28.06.24 SITE PLAN
DIMENSIONS: Verify dimensions before commencing any work or making any shop
N
to 2 Beach Houses DD2 Development Application Client Issue 19.07.24
S
drawings. Figured dimensions take precedent over scale.
COPYRIGHT: This drawing is copyright and property of the architects and must not be
2/27 RossCrescent DD3 Client Issue 01.08.24 1:200 @ A3 AUGUST 2024 2308 2001 DD4
DD4 Client Issue 09.08.24
retained, copied or used without their written authority. Sunshire Beach Scale Date Project No. Drawing No. Revision
W
Used in these records
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