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Appendix D - Engineering Assessment · OPW26/0090
DANYA COOK TOWN PLANNING
Appendix D
Engineering Assessment
Prepared by Sunshine Coast Civil Engineers
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Page 2
Danya Cook Town Planning
Danya Cook
PO Box 9410
Pacific Paradise, 4564
15 June 2026
RE: Reconfiguring a Lot
28 Overlander Avenue, Cooroy
Stormwater Assessment
Dear Danya,
This letter has been prepared in support of a Reconfiguring a Lot development approval to the Noosa Shire
Council (Council). The proposed reconfiguration is for a 1 into 2 subdivision of a Low-Density Residential
lot at 28 Overlander Avenue, Cooroy QLD 4563 (Lot 34 on RP179733). The purpose of this Stormwater
Assessment letter is to provide advice in relation to the proposed development’s stormwater obligations
under the Noosa Plan 2020 Planning Scheme.
Concept Civil Engineering plans have been attached to this letter. The attached plans also include Water
and Sewer connection works for separate review by Unitywater.
Existing Site and Lawful Point of Discharge (LPD)
The existing site currently comprises of a residential dwelling . The site currently appears to discharge via
overland flow to:
- LPD1: Overland flow over the site’s frontage and into Overlander Avenue. Flows are collected by
the Council-owned stormwater network in the road reserve and directed to the Northwest.
- LPD2: Overland flow over the site’s rear boundary and into the Noosa District State High School
(Lot 210 on MCH4371). There is a Council-mapped stream to the Norrth of the site that collects the
overland flow.
It is proposed to maintain the existing LPD arrangement. It is proposed to formalise LPD1 for Lot 1 with a
new kerb-adaptor connection to Overlander Avenue. Some negligible post-development nuisance flows
may occur from Lot 1 over the Lot 2 driveway, and from Lot 2 in to neighbouring lot 33 on RP179733,
however these are consistent with the pre-development arrangement and appear to be managed by
fencing and landscaping along the property boundary.
www.sunshinecoastcivilengineers.com
Page 3
An aerial image of the site is shown in Figure 1. For further detail of the existing site, refer to the detailed
survey plan prepared by Surveyors Co dated 08 May 2025.
Figure 1 Subject Site Aerial (Source: Noosa Intramaps)
Flooding
The subject site is not flagged by Council’s Flood Hazard Overlay Map. No recommendations are provided.
Stormwater Quantity
A Rational Method hydrologic model in accordance with the Queensland Urban Drainage Manual (QUDM)
was developed to quantify the stormwater discharge for the major and minor storm event. The following
parameters were used for the model:
- Storm event recurrence intervals were selected in accordance with QUDM Tables 7.3.1 and 7.3.2:
o Minor event: 0.5 EY
o Major event: 1% AEP
- Intensity, Frequency, and Duration rainfall data was sourced from the Bureau of Meteorology’s
2016 dataset. Intensities were multiplied by 1.15* to estimate present-day intensities due to
Climate Change.
- Catchment coefficients and areas were obtained by comparing the detailed survey against QUDM
Table 4.5.3
- Time of Concentration was taken as the standard inlet time of 5 minutes (QUDM Section 4.6.4)
- In the ultimate post-development scenario, it is assumed that Lot 1 will be developed to
approximately 75% impervious, and Lot 2 will remain as-is.
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Page 4
The results of the Rational Method analysis are summarised in Tables 1, 2, and 3. Full Rational Method
calculations are also attached to this letter.
Table 1 Pre-Development Rational Method
Area [ha] C10 Minor Storm Major Storm
Discharge [m3/s] Discharge [m3/s]
Subject Site 0.1710 0.76 0.053 0.157
Table 2 Post-Development Rational Method
Area [ha] C10 Minor Storm Major Storm
Discharge [m3/s] Discharge [m3/s]
Lot 1 (Vacant) 0.0540 0.70 0.015 0.046
Lot 1 (Developed) 0.0540 0.85 0.019 0.054
Lot 2 0.1170 0.88 0.042 0.118
Table 3 Combined Post-Development Discharges
Pre-Development Post-Development Difference Difference
[m3/s] [m3/s] [m3/s] [-]
Subject site Minor 0.053 0.061 0.008 +15%
Storm (Developed)
Subject site Major 0.157 0.172 0.015 +10%
Storm (Developed)
The results above indicate that the proposed kerb adaptor is a suitable arrangement for LPD1. As the
proposed Reconfiguring a Lot application introduces no new impervious areas to the site, no further
stormwater quantity controls (i.e. detention tanks) are recommended at this stage1.
A review of the Low-Density Residential Zone Code and the Low-Density Housing Code confirms that
stormwater detention is not required to meet the relevant Performance Outcomes. No on-site detention to
maintain pre-development discharge rates is anticipated for the future development of Lot 1, unless
conditioned by Council as part of the Development Approval.
Stormwater Quality
The State Planning Policy proposes triggers for stormwater quality management that apply to ‘high-risk’
developments. The criteria include one or more of the following:
- A Material Change of Use for an urban purpose which involves greater than 2,500m2 of land that:
o will result in an impervious area greater than 25% of the net developable area; or
o will result in six (6) or more dwellings.
- A Reconfiguration of a Lot for urban purposes that involves a land area greater than 2,500m2 and
will result in six (6) or more lots; or
- Operational works for urban purposes that involve disturbing more than 2,500m2 of land.
1
The minor increase in combined discharges from Lot 1 (Vacant) and Lot 2 is due to assumptions regarding C10 values
rather than a material change to catchment hydrology.
www.sunshinecoastcivilengineers.com
Page 5
As the proposed development does not trigger any of the above criteria, stormwater quality compliance is
not mandatory. No further stormwater quality controls are recommended for this development.
Conclusion
In summary,
- The existing Lawful Point of Discharge arrangement is proposed to be maintained.
- A new kerb adaptor to Overlander Avenue is proposed to service Lot 1
- The subject site is not flagged by the Flood Hazard Overlay Map
- No stormwater quantity controls are recommended
- No stormwater quality controls are recommended
For further information, refer to the attached Concept Civil Engineering Plans.
Regards,
Michael Van Itallie
Director, RPEQ CPEng NER
RPEQ 13469
Attachments:
1. C001 Site Works Plan
2. C002 Sewer and Water Connections
3. C003 Sewer Longitudinal Sections
4. Rational Method Calculations
www.sunshinecoastcivilengineers.com
Page 6
SW
S
(D)
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LOT 2 LPD TO REMAIN AS IS.
(D)
DISCHARGES TO COUNCIL-MAPPED
OLD (NON-STANDARD SHAPE) 33 STREAM OFF PAGE
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CROSSOVER TO BE RETAINED.
SW
RP179733
(D)
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W PROVIDE KERB ADAPTOR FOR LOT 1
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LAWFUL POINT OF DISCHARGE.
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(D
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0.5EY DISCHARGE: 15L/s
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REFER STANDARD DRAWING RS-081.
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1.00 C
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OFFS
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ADAP 0 KERB
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1 .2 0 T
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O MAT
TOR
EXIST CH
0.5
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PA \/
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IGN
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RE
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0
NEW CROSSOVER GENERALLY
5.0
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IN ACCORDANCE WITH
S
STANDARD DRAWING RS-049.
PROPOSED PROPOSED
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LOT 1 LOT 2
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W SW SW SW
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111.60
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S S S S S S S S S S S S
S
1
11
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35
RP179733
S
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112
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PLAN VIEW
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SCALE: 1:100
LEGEND GENERAL NOTES
1. ALL DIMENSIONS GIVEN ON THESE DRAWINGS ARE IN METRES,
CADASTRAL BOUNDARY UNLESS NOTED OTHERWISE.
100.0 EXISTING CONTOUR (MAJOR AND MINOR) 2. CIVIL DESIGN HAS BEEN OVERLAID OVER DETAILED SURVEY
PROVIDED BY SURVEYORS CO. DATED 08.05.26. REFER SURVEYOR
W EXISTING WATER FOR ALL BENCHMARK AND DATUM CONTROLS.
S EXISTING SEWER 3. THESE DRAWINGS SHOULD BE READ IN CONJUNCTION WITH THE
\/ \/ EXISTING OVERHEAD POWER TOWN PLANNER PROPOSED BOUNDARIES PREPARED BY DANYA
SW SW SW EXISTING STORMWATER COOK TOWN PLANNING DATED 26.01.26. REFER TO TOWN
SW SW SW PROPOSED STORMWATER PLANNER/SURVEYOR FOR ALL CADASTRAL SET OUT.
W PROPOSED WATER 4. BELOW-GROUND SERVICES HAVE BEEN OBTAINED FROM RECORDS.
S PROPOSED SEWER IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO ESTABLISH THE
LOCATION AND THE LEVEL OF ALL EXISTING SERVICES PRIOR TO THE
COMMENCEMENT OF ANY WORK. ANY DISCREPANCIES SHALL BE
REPORTED TO THE PRINCIPAL'S REPRESENTATIVE. REQUIRED
CLEARANCES SHALL BE OBTAINED FROM THE RELEVANT SERVICE
AUTHORITY.
5. PROPERTY BOUNDARIES ARE SUBJECT TO CONFIRMATION BY FIELD
SURVEY CARRIED OUT BY A REGISTERED SURVEYOR.
REV:DESCRIPTION: DATE DRAFT CHECKED APPROVEDAPPROVED BY: CLIENT: PROJECT: DRAWING TITLE:
SITE WORKS
N
01 ISSUED FOR INFORMATION 15.06.26 JCD MVI MVI DANYA COOK TOWN PLANNING RECONFIGURING A LOT
0 3 6 A1 ORIGINAL 28 OVERLANDER AVENUE
13469
Meters 1:100
PROJECT NUMBER:
Signed: 26022 SIZE COOROY 4563
Sunshine Coast Civil Engineers
Copyright in the drawings, information and data recorded in this document is the property of Sunshine Coast Civil Engineers Pty Ltd. This document and
DRAWING
the information are solely for the use of the authorized recipient and this document may not be used, copied, or reproduced in whole NUMBER: REVISION:
or in part for any
Date: 15/06/2026 www.sunshinecoastcivilengineers.com
purpose than that for which it was supplied by Sunshine Coast Civil Engineers Pty Ltd. This document shall only be used for construction if stamped
approved for construction. C001 and 01
Page 7
\/
LEGEND
S
CADASTRAL BOUNDARY
\/
100.0 EXISTING CONTOUR (MAJOR AND MINOR)
W
W EXISTING WATER
NEW CROSSING FOR WATER PROPERTY
S
SW
S EXISTING SEWER SERVICE. REFER SEQ-WAT-1108-2. TUNNEL
) (D
\/ \/ EXISTING OVERHEAD POWER
\/
BORE UNDER EXISTING ROADWAY.
SW SW SW EXISTING STORMWATER
W
SW
SW SW SW PROPOSED STORMWATER CONNECT NEW PROPERTY
(D
PROPOSED WATER
S
)
W SERVICE VIA TAPPING BAND NEW DN20 WATER METER TO SERVICE
\/
PROPOSED SEWER CONNECTION TO EXISTING MAIN.
|||
S
LOT 1. REFER SEQ-WAT-1108-3. ASSUMED LOCATION FOR EXISTING
SW
SEWER PC. TO BE RETAINED TO
33
(D
W
)
SERVICE PROPOSED LOT 2.
A RP179733
S
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SW
- |||
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(D)
W ||| ||| ||| |||
3.00 PROPOSED EASEMENT
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W ||| ||| ||| |||
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SW
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SW EXISTING DN150 AC
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GENERAL NOTES EXISTING DN100 AC
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111
(D)
WATER RETICULATION. RETICULATION SEWER.
S
|||
SET
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1. PRELIMINARY DESIGN ONLY. DESIGN IS SUBJECT TO NOOSA SHIRE COUNCIL DEVELOPMENT ASSET ID: 2038264 USIL: 107.71
|||
|||
F
APPROVAL , UNITYWATER (UW) CONNECTION APPROVAL, AND DETAILED DESIGN. DSIL: 107.22
RD OF
SW
111
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2. EXISTING WATER AND SEWER SERVICES HAVE BEEN PLOTTED FROM UNITYWATER'S GIS ASSET ID: 2528191
(D)
W
|||
\/
DATA AND MUST BE VERIFIED ON SITE PRIOR TO CONSTRUCTION. ANY DISCREPANCIES TO
|||
ANDA
BE RAISED WITH THE SUPERINTENDENT.
S
||| ||| |||
PROPOSED PROPOSED 210
T
3. ALL PRODUCTS AND MATERIALS USED IN CONSTRUCTION OF WATER AND GRAVITY
0.30 S
|||
SEWERAGE NETWORK WORKS SHALL BE IN ACCORDANCE WITH THE SOUTH EAST LOT 1 LOT 2 R.1087
MCH4371
\/
QUEENSLAND CODE ACCEPTED CIVIL INFRASTRUCTURE PRODUCTS AND MATERIAL LIST,
|||
W
AND THE MOST RECENT VERSION OF THE LIST IN EFFECT AT THE DATE OF THE W SCHOOL RESERVE
CONSTRUCTION PRE-START MEETING. W ||| ||| ||| |||
S
SW
6. THE CONSTRUCTION OF THE WATER AND SEWERAGE WORKS SHOWN ON THESE DRAWINGS 1/1 TYPE 'X' INTERNAL DROP INTO
4.52
SHALL BE SUPERVISED BY AN ENGINEER WHO HAS RPEQ REGISTRATION. WORKS NOT EXISTING HYDRANT. 111.60 1.50 CHAMBER. REFER SEQ-SEW-1303-1.
2/1
COMPLYING WITH THIS REQUIREMENT WILL NOT BE PERMITTED TO CONNECT INTO UW's ASSET ID: 2102496 4/1 3/1 LIVE CONNECTION TO BE MADE BY
NETWORK.
W
S S S S S S UNITYWATER.
5. THE CONSTRUCTOR SHALL VERIFY THE LOCATION AND DEPTH OF EXISTING SERVICES WITH
OAS.
R3.
FER S D
1
\/
11
R
RELEVANT ASSET OWNERS AND AUTHORITIES BEFORE COMMENCING WORKS. SV EXISTING DN1070 MH
00
OFFS N-STANDA
3.00 PROPOSED EASEMENT
35
1.00 EASEMENT
LON
RP179733 SL: 110.82
112
IL: 107.71
GF
EXISTING WATER METER TO
S
WATER NOTES
ET. RE
ASSET ID: 2660454
OR
|||
REMAIN TO SERVICE LOT 1 TYPE G-6 TERMINAL MS REFER NEW DN150 PVC
O
W
\/
1.51 N
MB
1. ALL CONSTRUCTION OF WATER SUPPLY NETWORK WORKS SHALL BE IN ACCORDANCE WITH 112 SEQ-SEW-1314-1. CONNECT NEW SEWER RETICULATION.
THE WATER SUPPLY CODE OF AUSTRALIA, SOUTH EAST QUEENSLAND SERVICE PROVIDERS
EN
TYPE A PROPERTY CONNECTION REFER LONGITUDINAL
|||
D
EDITION VERSION 1.3 (AUGUST 2019), PART 2: CONSTRUCTION AND PART 3: DRAWINGS. FOR LOT 1. REFER SECTION ON C003.
2. FOR DETAILS OF PROPOSED DOMESTIC SERVICES, REFER SEQ STANDARD DRAWINGS SEQ-SEW-1104-1. REFER SOAS FOR
S
SEQ-WAT-1111 SERIES. NON-STANDARD PC DEPTH.
\/
W
SEWER NOTES EXISTING DN150 AC
1. ALL CONSTRUCTION OF GRAVITY SEWERAGE NETWORK WORKS SHALL BE IN ACCORDANCE FIRE HYDRANT RETICULATION SEWER.
\/
S
WITH THE GRAVITY SEWERAGE CODE OF AUSTRALIA, SOUTH EAST QUEENSLAND SERVICE COVERAGE 40m RADIUS USIL: 108.24
PROVIDERS EDITION VERSION 2.0 (JULY 2019), PART 2: CONSTRUCTION AND PART 3: DSIL: 107.74
W
DRAWINGS. ASSET ID: 2528197
2. THE CONTRACTOR SHALL VERIFY THE LOCATION AND DEPTH OF EXISTING SERVICES WITH \/
RELEVANT AUTHORITIES BEFORE COMMENCING WORKS.
S
3. BENCH MARK AND LEVELS TO AHD.
PLAN VIEW
SCALE: 1:200
VEGETATION PROTECTION
ROAD RESERVE SUBJECT SITE
1. WHEN WORKING WITHIN 4m OF TREES, RUBBER OR HARDWOOD GIRDLES SHALL BE
OVERLANDER AVENUE 34RP179733
0.34 ESTIMATED
CONSTRUCTED WITH 1.8m BATTENS CLOSELY SPACED AND ARRANGED VERTICALLY FROM
CLEARANCE
GROUND LEVEL. GIRDLES SHALL BE STRAPPED TO TREES PRIOR TO CONSTRUCTION AND
0.60 COVER
REMAIN UNTIL COMPLETION.
2. TREE ROOTS SHALL BE TUNNELLED UNDER RATHER THAN SEVERED.
3. IF ROOTS ARE SEVERED, THE DAMAGED AREA SHALL BE TREATED WITH A SUITABLE
FUNGICIDE. CONTACT COUNCIL ARBORIST FOR FURTHER ADVICE.
4. ANY TREE LOPPING REQUIRED SHALL BE UNDERTAKEN BY AN APPROVED ARBORIST. W W W W W
TUNNEL BORE CONDUIT
UNDER CARRIAGEWAY
(FROM RECORDS)
SOIL
1.40 DEPTH TO
STORMWATER
1. TOPSOIL AND SUBSOIL SHALL BE STOCKPILED SEPARATELY. EXISTING DN100 AC EXISTING DN300 PROPOSED DN20 METER.
2. CARE SHALL BE TAKEN TO PREVENT SEDIMENT FROM ENTERING THE STORMWATER WATER RETICULATION. STORMWATER REFER SEQ-WAT-1108-3.
CONNECT NEW SERVICE (FROM RECORDS)
SYSTEM. THIS MAY INVOLVE PLACING APPROPRIATE SEDIMENT CONTROLS AROUND
STOCKPILES. VIA TAPPING BAND.
3. IF ACID SULPHATE SOILS ARE ENCOUNTERED IN THE WORKS AREA, REFER TO THE
QUEENSLAND ACID SULPHATE SOIL TECHNICAL MANUAL. SECTION A 0 3 6
SCALE: 1:100 1:100 Meters
REHABILITATION ALL LIVE WORKS ASSOCIATED WITH THE WATER OR
1. PREDISTURBANCE SOIL PROFILES AND COMPACTION LEVELS SHALL BE REINSTATED. SEWER NETWORK SHALL BE CARRIED OUT AT THE
DEVELOPER'S COST BY QUOTATION REQUEST TO UW
2. PREDISTURBANCE VEGETATION PATTERNS SHALL BE RESTORED. PRIVATE WORKS ONLY.
REV:DESCRIPTION: DATE DRAFT CHECKED APPROVEDAPPROVED BY: CLIENT: PROJECT: DRAWING TITLE:
WATER AND SEWER CONNECTIONS
N
01 ISSUED FOR INFORMATION 15.06.26 JCD MVI MVI DANYA COOK TOWN PLANNING RECONFIGURING A LOT
13469 28 OVERLANDER AVENUE
1:200
0
PROJECT NUMBER: A1 ORIGINAL
6 12
Meters
Signed: 26022 SIZE COOROY 4563
Sunshine Coast Civil Engineers
Copyright in the drawings, information and data recorded in this document is the property of Sunshine Coast Civil Engineers Pty Ltd. This document and
DRAWING
the information are solely for the use of the authorized recipient and this document may not be used, copied, or reproduced in whole NUMBER: REVISION:
or in part for any
Date:15/06/2026 www.sunshinecoastcivilengineers.com
purpose than that for which it was supplied by Sunshine Coast Civil Engineers Pty Ltd. This document shall only be used for construction if stamped
approved for construction. C002 and 01
Page 8
STRUCTURE ID 1/1 2/1 3/1 4/1
MAINTENANCE SHAFT
MH/MH TYPE
Bend Only
Bend Only
TYPE G-1
Bends
Bends
DROP THROUGH STRUCTURE
-0.000
0.000
MH/MS COVER TYPE B
BRANCH DROP TYPE X
BRANCH LINE NUMBER
PROPERTY CONNECTION TYPE A
LOT 1 IL 109.30 CH 42.01
CHAMBER. REFER SEQ-SEW-1303-1.
0.89 TYPE 'X' INTERNAL DROP INTO
LINE 2/EX ENTERS DN150 IL 107.740
PIPE DETAILS DN150 PVC DN150 PVC DN150 PVC
GRADE (1 IN X) 1:60.0 1:60.0 1:60.0
DATUM RL 104.265 mAHD RL 105.125 mAHD
EMBEDMENT TYPE
2.173 108.600
2.192 108.616
2.221 108.652
2.157 109.300
INVERT LEVEL
2.193
DEPTH TO INVERT
FROM FINISHED LEVEL
(110.774)
110.774
110.808
(110.808)
110.873
(110.873)
111.457
(111.457)
FINISHED (AND EXISTING)
SURFACE LEVEL
N:7077091.85
N:7077090.92
N:7077088.77
N:7077056.06
E:490871.30
E:490871.46
E:490871.03
E:490850.02
SETOUT COORDINATES
ALL LIVE WORKS ASSOCIATED WITH THE WATER OR
42.01
CHAINAGE
0.00
0.94
3.13
SEWER NETWORK SHALL BE CARRIED OUT AT THE
0.94 2.19 38.88 DEVELOPER'S COST BY QUOTATION REQUEST TO UW
LINE 1 PRIVATE WORKS ONLY.
1:200H 1:50V
REV:DESCRIPTION: DATE DRAFT CHECKED APPROVEDAPPROVED BY: CLIENT: PROJECT: DRAWING TITLE:
0 1.5 3
01 ISSUED FOR INFORMATION 15.06.26 JCD MVI MVI DANYA COOK TOWN PLANNING RECONFIGURING A LOT SEWER LONGITUDINAL SECTIONS
1:50 Meters
13469
28 OVERLANDER AVENUE A1 ORIGINAL
1:200
0 6 12
PROJECT NUMBER:
Signed: Meters COOROY 4563 26022 SIZE
Sunshine Coast Civil Engineers
Copyright in the drawings, information and data recorded in this document is the property of Sunshine Coast Civil Engineers Pty Ltd. This document and
DRAWING
the information are solely for the use of the authorized recipient and this document may not be used, copied, or reproduced in whole NUMBER: REVISION:
or in part for any
Date:15/06/2026 www.sunshinecoastcivilengineers.com
purpose than that for which it was supplied by Sunshine Coast Civil Engineers Pty Ltd. This document shall only be used for construction if stamped
approved for construction. C003 and 01
Page 9
RATIONAL METHOD CALCS
PROJECT NUMBER 26022 ADDRESS 28 OVERLANDER AVENUE, COOROY
Rainfall
Frequency Catchment Peak Discharge
Inputs Intensity
Factors [-] Coefficients [-] [m3/s]
[mm/hr]
Area Tc Climate Change Tc
Catchment ID fi C10 Notes F39% (0.5EY) F1% C39% (0.5EY) C1% i39% (0.5EY) Tci1% Q39% (0.5EY) Q1%
[ha] [min] Factor [-]
Site Predev 0.1710 5.00 0.29 0.76 1.15 FOR 1 DEGREE OF WARMING (1DW) 0.85 1.20 0.65 0.91 173 363 0.053 0.157
LOT 1 (Vacant) 0.0540 5.00 0.00 0.70 1.15 FOR 1 DEGREE OF WARMING (1DW) 0.85 1.20 0.60 0.84 173 363 0.015 0.046
LOT 1 (Developed) 0.0540 5.00 0.75 0.85 1.15 FOR 1 DEGREE OF WARMING (1DW) 0.85 1.20 0.72 1.00 173 363 0.019 0.054
LOT 2 0.1170 5.00 0.42 0.88 1.15 FOR 1 DEGREE OF WARMING (1DW) 0.85 1.20 0.75 1.00 173 363 0.042 0.118
Used in these records
Appendix D - Engineering Assessment.pdfRelated documentApplication case desk ↗
Appendix D - Engineering Assessment.pdfRelated documentApplication case desk ↗
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