OXFORD FALLS GRAMMAR SCHOOL - OVAL KIOSK · Level 3, 48 Chandos Street, St Leonards NSW 2065 1...

Taylor Thomson Whitting (NSW) Pty Ltd (ACN 113 578 377)

as trustee for the Taylor Thomson Whitting NSW Trust (ABN 59 514 956 558) I Consulting Engineers Level 3, 48 Chandos Street, St Leonards NSW 2065

1 October 2019 191571 CAAA EPM Projects Level 2 146 Arthur Street North Sydney NSW 2060

Attention: Marcus Bankowski

OXFORD FALLS GRAMMAR SCHOOL - OVAL KIOSK

Civil Engineering Statement

Dear Marcus,

This letter aims to provide a review of overland flow and flooding requirements in the context of the proposed Oval Kiosk at Oxford Falls Grammar School. Concept drawings are attached in Appendix A.

Oxford Falls Grammar School is located within the bounds of Northern Beaches Council in Oxford Falls. The proposed Oval Kiosk is proposed in the south-west of the site near the corner of Dreadnought Road and Wakehurst Parkway as indicated within Figure 1.

Figure 1: Oval Kiosk Location

Flood planning advice received from Northern Beaches Council indicates a flood planning level at the Oxford Falls Grammar School site of 75.25m AHD with a Probable Maximum Flood (PMF) level of 75.34m AHD.

OXFORD FALLS GRAMMAR SCHOOL - OVAL KIOSK 1 October 2019 Prepared For Marcus Bankowski, EPM Projects 191571 CAAA

Taylor Thomson Whitting (NSW) Pty Ltd © 2019 Taylor Thomson Whitting

The location of the Oval Kiosk is located outside of the Flood Planning Area as shown in Council’s flood mapping and therefore will not be affected during the 1% AEP storm event and PMF. The location of this kiosk in relation to the proposed flood levels is detailed in Appendix B. The proposed finished floor level of the kiosk is equal to 76.40 AHD which is above the maximum water level in the PMF.

There are no significant overland flow paths being blocked by the kiosk as indicated on the site survey. Localised overland flow is proposed to be directed around the kiosk through a spoon drain that will be appropriately sized for the upstream catchment during detailed design.

Due to the location of the Oval Kiosk and its proposed height, the proposal is satisfactory with regards to flooding and overland flow.

Should you require anything further please contact the undersigned.

Yours faithfully, TAYLOR THOMSON WHITTING (NSW) PTY LTD in its capacity as trustee for the TAYLOR THOMSON WHITTING NSW TRUST

PAUL YANNOULATOS Technical Director

P:\2019\1915\191571\Reports\TTW\Civil\Kiosk\Civil Oval Kiosk Statement.docx


Taylor Thomson Whitting (NSW) Pty Ltd © 2019 Taylor Thomson Whitting

Appendix A

Concept Drawings prepared by Allen Jack and Cottier

DREADNOUGHT ROAD

WA

KE

HU

RS

T P

AR

KW

AY

OX

FO

RD

FA

LLS R

OA

D

PROPOSED

KIOSK

EXISTING

FIELD & OVAL

Key Client Architect Project Drawing Title Scale Drawing No. Issue

Proj. No.

Revisions

79 Myrtle Street Chippendale NSW 2008 AUSTRALIApl +61 2 9311 8222 fx +61 2 9311 8200ABN 53 003 782 250

Do not scale drawings. Use figured dimensions only. Check & verify levels and dimensions on site prior to the commencement of any work, the preparation of shop drawings or the fabrication of components. This drawing is the copyright of Allen Jack + Cottier Architects and is protected under the Copyright Act 1968. Do not alter, reproduce or transmit in any form, or by any means without the express permission of Allen Jack + Cottier Architects. Nominated Architects: Michael Heenan 5264, Peter Ireland 6661

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Project Status

NOT FOR CONSTRUCTION

OFGS Oval Kiosk

OFGS Oval Kiosk

FOR REVIEW OF ENVIRONMENTAL FACTORS

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COVER SHEET REF0000

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Oxford Falls Grammar School

Auth

or

1078 Oxford Falls Road,OXFORD FALLS NSW 2100


DRAWING LIST - OVAL KIOSK

DRAWING NO. SHEET NAME

REF0000 COVER SHEET

REF1000 SITE PLAN

REF2000 FLOOR PLAN

REF3100 ELEVATION

REF3200 SECTION

REF4000 DRAINAGE & SEDIMENT CONTROL PLAN

No. Date Description Chk'd Appr'd

1 24/09/19 DRAFT FOR COMMENT NZ JW

2 26/09/19 ISSUE TO CIVIL FOR REVIEW NZ JW

3 1/10/19 ISSUE TO REF NZ JW

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Taylor Thomson Whitting (NSW) Pty Ltd © 2019 Taylor Thomson Whitting Page 4

Appendix B

Northern Beaches Council Flood Planning Advice

Issue Date: 17/08/2018 Page 1 of 12

FLOOD INFORMATION REQUEST – MULTI-PURPOSE

Property: Oxford Falls Grammar School

Lot DP:

Issue Date: 17/08/2018

Flood Study Reference: Narrabeen Lagoon Flood Study, 2013

Flood Information for lot:

1% AEP – See Flood Map B 1% AEP Maximum Water Level3: 74.75 mAHD 1% AEP Maximum Peak Depth from natural ground level3: 2.95 m 1% AEP Maximum Velocity: 2.93 m/s 1% AEP Provisional Flood Hazard: High See Flood Map E 1% AEP Hydraulic Categorisation: Floodway See Flood Map F

Flood Planning Area – See Flood Map C Flood Planning Level (FPL)1,2, 3 &4: 75.25 m AHD

Probable Maximum Flood (PMF) – See Flood Map D PMF Maximum Water Level2: 75.34 m AHD PMF Maximum Depth from natural ground level: 4.07 m PMF Maximum Velocity: 4.74 m/s PMF Flood Hazard: High See Flood Map G PMF Hydraulic Categorisation: Floodway See Flood Map H

Flood Risk Precinct – See Map K


1The flood information does not take into account any local overland flow issues nor private stormwater drainage systems. 2Overland flow/mainstream water levels may vary across a sloping site, resulting in variable minimum floor/ flood planning levels across the site. 3Intensification of development in the former Pittwater LGA requires the consideration of climate change impacts which may result in higher minimum floor levels than those indicated on this flood advice. 4Vulnerable/critical developments require higher minimum floor levels using the higher of the PMF or Flood Planning Level

General Notes: All levels are based on Australian Height Datum (AHD) unless otherwise noted.

This is currently the best available information on flooding; it may be subject to change in the future.

Council recommends that you obtain a detailed survey of the above property and surrounds to AHD by a registered surveyor to determine any features that may influence the predicted extent or frequency of flooding. It is recommended you compare the flood level to the ground and floor levels to determine the level of risk the property may experience should flooding occur.

Development approval is dependent on a range of issues, including compliance with all relevant provisions of Northern Beaches Council’s Local Environmental Plans and Development Control Plans.

Please note that the information contained within this letter is general advice only as a detail survey of the property as well as other information is not available. Council recommends that you engage a suitably experienced consultant to provide site specific flooding advice prior to making any decisions relating to the purchase or development of this property.

The Flood Studies on which Council’s flood information is based are available on Council’s website.


FLOOD LEVEL POINTS

Note: Cadastre Lines (Source: NSW Government Land and Property Information), flood levels/extents (Source: N/A) and aerial photography (Source: NearMap 2014) are indicative only.


Flood Levels

ID

5% AEP Max WL (m

AHD)

5% AEP Max

Depth (m)

1% AEP Max WL (m

AHD)

1% AEP Max

Depth (m)

1% AEP Max

Velocity (m/s)

Flood Planning

Level (m)

PMF Max WL (m

AHD)

PMF Max

Depth (m)

PMF Max

Velocity (m/s)

1 N/A N/A 73.90 0.02 0.51 74.21 74.04 0.16 1.95

2 N/A N/A 74.16 0.02 0.00 74.65 74.42 0.28 1.04

3 N/A N/A 74.34 0.04 0.46 74.82 74.63 0.33 0.73

4 N/A N/A 74.45 0.12 0.54 74.95 74.77 0.44 0.72

5 N/A N/A N/A N/A N/A 75.04 74.82 0.19 0.54

6 N/A N/A N/A N/A N/A 73.96 N/A N/A N/A

7 N/A N/A N/A N/A N/A 74.58 74.44 0.35 1.48

8 N/A N/A 74.43 0.06 0.63 74.92 74.72 0.35 0.97

9 N/A N/A 74.62 0.09 0.62 75.11 74.87 0.34 0.86

10 N/A N/A N/A N/A N/A 74.44 74.53 0.55 1.93

11 N/A N/A 74.38 0.07 0.49 74.88 74.80 0.49 0.98

12 N/A N/A 74.67 0.06 0.67 75.19 74.98 0.37 1.32

13 N/A N/A 73.81 0.06 0.66 74.36 74.90 1.15 1.30

14 N/A N/A N/A N/A N/A 74.76 75.00 0.67 1.76

15 74.00 0.46 74.27 0.73 1.04 74.82 75.20 1.66 1.31

16 74.03 1.99 74.32 2.29 0.80 74.88 75.23 3.19 1.01

WL – Water Level PMF – Probable Maximum Flood N/A = no peak water level/depth/velocity available in flood event


FLOOD MAP B: FLOODING - 1% AEP EXTENT

Notes:

Extent represents the 1% annual Exceedance Probability (AEP) flood event.

Flood events exceeding the 1% AEP can occur on this site.

Extent does not include climate change.

Cadastre Lines (Source: NSW Government Land and Property Information), flood levels/extents (Source: N/A) and aerial photography (Source Near Map 2014) are indicative only.


FLOOD MAP C: FLOOD PLANNING AREA EXTENT

Notes:

Extent represents the 1% annual Exceedance Probability (AEP) flood event + freeboard.

Extent does not include climate change.

Cadastre Lines (Source: NSW Government Land and Property Information), flood levels/extents (Source: N/A) and aerial photography (Source Near Map 2014) are indicative only.


FLOOD MAP D - PMF EXTENT MAP

Notes:

extent represents the Probable Maximum Flood (PMF) flood event

extent does not include climate change

Cadastre Lines (Source: NSW Government Land and Property Information), flood levels/extents (Source: N/A) and aerial photography (Source: NearMap 2014) are indicative only


FLOOD MAP E – 1% AEP FLOOD HAZARD EXTENT MAP

Notes:

extent represents the 1% annual Exceedance Probability (AEP) flood event




FLOOD MAP F – 1% AEP FLOOD HYDRAULIC CATEGORY EXTENT MAP

Notes:





FLOOD MAP G – PMF FLOOD HAZARD EXTENT MAP

Notes:


extent represents the Probable Maximum Flood (PMF) event




FLOOD MAP H – PMF FLOOD HYDRAULIC CATEGORY EXTENT MAP

Notes:

extent represents the Probable Maximum Flood (PMF) event




FLOOD MAP K – FLOOD RISK PRECINCT MAP

Notes:

Low Flood Risk precinct means all flood prone land not identified within the High or Medium flood risk precincts.

Medium Flood Risk precinct means all flood prone land that is (a) within the 1% AEP Flood Planning Area; and (b) is not

within the high flood risk precinct.

High Flood Risk precinct means all flood prone land (a) within the 1% AEP Flood Planning Area; and (b) is either subject to a

high hydraulic hazard, within the floodway or subject to significant evacuation difficulties (H5 and or H6 Life Hazard Classification).

Does not include climate change

OXFORD FALLS GRAMMAR SCHOOL - OVAL KIOSK · Level 3, 48 Chandos Street, St Leonards NSW 2065 1...

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