Urban Proper ty Corporation.

Bridge Access from The Barham River Road.

We acknowledge that the maintenance and repair o f the bridge and access to our land from the Barham River Road will be our responsibility in perpetuity.

Reasons for siting the bridge at that particular location on the Barham River Road: -

1. The road and our land immediately adjacent are above the flood levels as determined by the CCMA flood advice dated 10th November 2020.

a. This provides a means o f access and egress to the land at all times. b. Our adjacent land has a significant dry area which can facilitate the mustering of

cattle in a flood event. c. The bridge and its abutments will therefore not obstruct the flood flows

2. The location is central t o all three allotments which minimises the extent o f easements. 3. There are low traffic volumes on the road. 4. The bridge connection to the Barham River Road is on a straight stretch o f road that will provide

good visibility o f approaching traffic fo r vehicles exiting the property. 5. There are no trees o r bushes that will obstruct the sightlines o f vehicles exiting the property. 6. The access to the bridge is via land that is controlled by DELWP who have given their verbal

advice that they will agree to provide legal access subject to the extension o f the road reserve. 7. The land has been grazed and appears to be covered in exotic pasture grasses and this therefore

avoids the removal o f native vegetation. 8. The land is level on both sides o f the river which will simplify the design and construction. 9. The river is narrower than that at the site o f the current bridge thus reducing the span o f the

bridge. 10. The bridge at this location can be constructed outside the river banks.

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CMA Reference No: CCMA-F-2019-00807 Document No: 2 Date: 18 November 2020

Mr Peter Preece Cardno Suite 1, 27 - 31 Myers Street Geelong Vic 3220

peter.preeceOcardno.com.au

Dear Peter

CMA Reference Number: CCMA-F-2019-00807

Re: Flood Advice Request

Location Street: 80 Great Ocean Road Apollo Bay Vic 3233

Cadastral: Lot 1 TP180997, Parish Of Krambruk

I refer to your flood advice request dated 14 September 2020, received at the Corangamite Catchment Management Authority on 14 September 2020.

Below is the Authority's understanding of the application:

Proposed Development Type: Other Residential

Proposed Development Description: Replacement access for existing dwelling

on the abovementioned proposed development location

The Authority's assessment indicates that the property is covered by the following Zones and Overlays in the Colac Otway Planning Scheme;

Zone(s): Rural Conservation Zone

Overlay(s): Bushfire Management Overlay - Schedule 2, Design And Development Overlay - Schedule 10, Environmental Significance Overlay - Schedule 2, Environmental Significance Overlay - Schedule 4, Significant Landscape Overlay - Schedule 3, Land Subject To Inundation Overlay, Neighbourhood Character Overlay - Schedule 1, Erosion Management Overlay - Schedule 1

1800 002 262 info@ccma.vic.gov.au ccma.vic.gov.au

PO Box 159 64 Dennis Street Colac, Victoria 3250 ABS:

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Summary The Authority understands the application relates to construction of a new access track and crossing to replace the recently decommissioned bridge over Barham River. The Authority has provided previous advice regarding the proposal (CCMA-F-2019-00807 Document 1 dated 15 October 2015) which should be read in conjunction with this correspondence. Flood data provided in the previous correspondence has not been repeated herein.

The proposed crossing location is an area where, according to the Authority's flood mapping, 1% AEP flows are contained within the banks of Barham River. Terrain information available to the Authority, upon which the flood mapping is based, indicates the banks are slightly perched at this location. Any excavation of the banks therefore has the potential to change the floodplain behaviour. Similarly, a raised access track is likely to influence the behaviour of the floodplain.

The Authority can support the proposed location for the crossing and track, subject to the following conditions:

1. The track must be finished at the existing surface level

2. No fill shall be imported into the mapped floodplain

3. The crossing design must meet the following criteria, in addition to any conditions placed on a Works on Waterways Permit issued by the Authority:

a. Available flow area in Barham River must not be constricted or reduced.

b. The soffit of the crossing must provide a minimum 300mm freeboard over the 1% AEP flood level in Barham River (approximately 3.32 metres AHD according to plans submitted with the application)

c. Approaches to the crossing must match into existing surface levels prior to encroaching in the floodplain

d. No excavation of the banks of Barham River will be permitted

Notes:

• The proposed crossing will not satisfy the Authority's safety criteria for site access safety. Due to the established existing use of the lot, the Authority in this instance, is prepared to accept the accessway, despite not meeting our criteria, for the existing dwelling only. Under no circumstances shall the construction of this crossing influence or be considered to enable further development of the area to which it provides access.

The Corangamite CMA has provided this advice as preliminary information only and has been based on the information you have provided. Any flood level advice provided is based on the most accurate information currently available and may change if new information becomes available.

The Authority can provide further information regarding any proposed development of the property in response to a planning permit application referred by the Colac Otway in accordance with the Planning and Environment Act 1987.

This document contains flood level advice only and does not constitute approval or otherwise of any development at this location. The Authority recommends you seek further advice from the Colac Otway.

Should you have any queries, please do not hesitate to contact our Engineer and Floodplain Officer Michael Clarke on 1800 002 262 orfloodinfo@ccma.vic.gov.au. To assist the CMA in handling any enquiries please quote CCMA-F-2019- 00807 in your correspondence with us.

Yours sincerely,

Dr Geoff Taylor Floodplain Statutory Manager

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Figure 1. Subject property and proposed crossing location with flood depth overlaid (legend inset in metres). The 1% AEP water surface elevation of 3.32 metres AHD is shown at the crossing location.

Hazard Assessment for the crossing Flood depth affecting access to the property Up to 1.11 metres

Hazard Assessment (see below) Unacceptable based on depth alone

Flood Hazard According to Attorney-General's Departments Australian Emergency Management handbook Series (EMA Handbook 7), in recent years, a high proportion o f flood related deaths in Australia have occurred on flooded roads. Fatalities also result from people being swept away while crossing rivers, stormwater channels, overland flow paths o r other flooded areas. In assessing access routes between a site and safe ground it has been shown that people trying to evacuate from flooded land will do so by vehicle in most circumstances, and therefore development decisions should assume this to be the default method. For those who do decide to seek a pedestrian route, walking through flood water is also not considered to be an acceptable means o f evacuation. For some, walking is likely to be physically difficult o r even impossible and can be the cause o f significant mental o r physical exhaustion.

Analysis o f flood hazard is used to determine i f it is safe for people and vehicles leaving a property during a flood event. Inappropriate development is likely to increase the burden on emergency services and personnel i f an emergency evacuation is required due to illness, injury, inadequate preparation o r loss o f essential services. It should be noted that the relative evacuation time does not decrease the flood hazard.

Developments should not occur where the depth and flow o f floodwater on a property and affecting the access to the property is hazardous.

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Minimum floor levels provide protection for a property and its contents, but separate provisions are needed to protect people moving about or attempting to enter o r leave a property so that they are not at risk from deep or fast-flowing water.

Safety is assessed against Australian Rainfall and Runoff Revision Project 10 Safety Criteria.

Safety is defined in terms o f the depth and velocity o f water over the area in question during a 1% AEP flood event as follows:

1. Depth must be no greater than o r equal to 0.3 metres; and

2. Velocity must be no greater than or equal to 3.0 m/s; and

3. The product o f depth multiplied by velocity must be no greater than or equal to 0.3 m2 pe r second.

These safety criteria have been used for assessing land use and development on this site, however during flood events the state emergency service do not recommend entering flood waters of any depth or velocity. For further information please see http://www.ses.vic.gov.au/

Decision Guidelines and Background The following describes how Corangamite CMA assesses proposed developments in areas considered flood-prone. This assessment is based on the current best available information to the Authority and has been made considering the State Planning Policy Framework which contains strategic issues o f State importance which must be considered when decisions are made.

Clause 65 o f the planning scheme general provisions extends the consideration o f flood issues to all planning permit applications regardless o f whether the site is affected by a flood zone or overlay. Clause 65 requires that for the approval o f an application o r plan, the council must consider, among other things, the degree o f flood risk associated with the location o f the land and the use, development o r management o f the land so as to minimise flood risk.

In addition to clause 65, the flood zone and overlays contain their own decision guidelines that the council must consider when assessing an application. The Floodway Overlay (FO — clause 44.03), Land Subject to Inundation Overlay (LSIO

— clause 44.04), and Special Building Overlay (SBO — clause 44.05) contain more detailed decision guidelines.

Guidance on making an application for a planning permit where flooding is a consideration and an explanation o f how such an application will be assessed (in effect an explanation o f how the decision guidelines are applied) is provided in the Victorian Planning Provision (VPP) Practice Note "Applying for a Planning Permit under the Flood Provisions". A second practice note ("Applying the Flood Provisions in Planning Schemes" provides guidance about applying the flood provisions in planning schemes.

A copy o f the Practice Notes can be downloaded from the former Department o f Transport, Planning and Local Infrastructure website (www.dtpli.vic.gov.au) by following the links to Planning > Planning publications > Practice and Advisory Notes > Planning Practice Notes (or b y clicking the links below).

Planning Practice Note 11: Applying for a Planning Permit under the Flood Provisions, August 2015

- Planning Practice Note 12: Applying the Flood Provisions in Planning Schemes, June 2012

- Planning Practice Note 53: Managing coastal hazards and the coastal impacts o f climate change, August 2015

In assessing the suitability o f any new development, Corangamite CMA considers the following:

The safety o f future occupants

- Avoiding any adverse flood related impacts on other properties The protection o f waterways and other environmental assets Minimising potential property damage

- Ensuring there is no increased burden on community and emergency services.

To get our consent for a planning permit, your development must pass these five core requirements that we use to assess applications:

Works o r structures:

1. Must not affect floodwater flow capacity 2. Must not reduce floodwater storage capacity 3. Must meet minimum floor level height (above flood level) relevant to development location (freeboard) 4. Must not occur where the depth and flow o f floodwaters would create a hazard

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5. Must not occur in circumstances where the depth and flow o f floodwater affecting access to the property is hazardous.

1% AEP3 Flood Event The 1% AEP flood event means that a flood o f that magnitude (or greater) has a 1% chance o f occurring in any given year. It is also known as the 100 year Average Recurrence Interval (ARI5) flood; however a flood o f this size o r greater may occur more frequently than this, and can happen more than once in any year. The Victorian Government has determined that the 1% A E P flood is the appropriate standard to regulate and protect new developments through the planning and building systems (Victorian Floodplain Management Strategy 2016). The impacts o f floods rarer than the 1% A E P flood (i.e. with a probability o f less than 1% AEP) are not regulated through the planning and building systems.

The information contained in this correspondence is subject to the disclaimers and definitions attached.

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Definitions and Disclaimers 1. The area referred to in this letter as the 'proposed development location' is the land parcel(s) that, according to the

Authority's assessment, most closely represent(s) the location identified by the applicant. The identification of the 'proposed development location' on the Authority's GIS has been done in good faith and in accordance with the information given to the Authority by the applicant(s) and/or Council.

2. While every endeavour has been made by the Authority to identify the proposed development location on its GIS using VicMap Parcel and Address data, the Authority accepts no responsibility for or makes no warranty with regard to the accuracy or naming of this proposed development location according to its official land title description.

3. AEP as Annual Exceedance Probability — is the likelihood of occurrence of a flood of given size or larger occurring in any one year. AEP is expressed as a percentage (%) risk and may be expressed as the reciprocal of ARI (Average Recurrence Interval).

Please note that the 1% probability flood is not the probable maximum flood (PM F). There is always a possibility that a flood larger in height and extent than the 1% probability flood may occur in the future.

4. AHD as Australian Height Datum - is the adopted national height datum that generally relates to height above mean sea level. Elevation is in metres.

5. Nominal Flood Protection Level (NFPL) is the applicable flood level for the subject development plus freeboard (additional height above the flood level). The minimum floor level for a development is usually set at the NFPL.

6. ARI as Average Recurrence Interval - is the likelihood of occurrence, expressed in terms of the long-term average number of years, between flood events as large as or larger than the design flood event. For example, floods with a discharge as large as or larger than the 100 year ARI flood will occur on average once every 100 years.

7. LiDAR (Light Detection And Ranging) is an optical remote sensing technology which measures the height of the ground surface using pulses from a laser. LIDAR can be used to create a topographical map of the land and highly detailed and accurate models of the land surface.

8. No warranty is made as to the accuracy or liability of any studies, estimates, calculations, opinions, conclusions, recommendations (which may change without notice) or other information contained in this letter and, to the maximum extent permitted by law, the Authority disclaims all liability and responsibility for any direct or indirect loss or damage which may be suffered by any recipient or other person through relying on anything contained in or omitted from this letter.

9. This letter has been prepared for the sole use by the party to whom it is addressed and no responsibility is accepted by the Authority with regard to any third party use of the whole or of any part of its contents. Neither the whole nor any part of this letter or any reference thereto may be included in any document, circular or statement without the Authority's written approval of the form and context in which it would appear.

10. The flood information provided represents the best estimates based on currently available information. This information is subject to change as new information becomes available and as further studies are carried out.

References

1. Guidelines for Development in Flood Affected Areas, Department of Environment, Land, Water and Planning, 2019: https://www.water.vic.gov.au/ data/assets/pdf file/0025/409570/Guidelines-for-Development-in- Flood finalAA.pdf

2. Australian Rainfall and Runoff Revision Project 10— Appropriate Safety Criteria for People April 2010. http://arr.qa.gov.au/ data/assets/pdf file/0005/40487/ARR Project 10 Staqe1 report Final.pdf

3. Australian Rainfall and Runoff Revision Project 10— Appropriate Safety Criteria for Vehicles February 2011. http://arr.qa.gov.au/ data/assets/pdf file/0004/40486/ARR Project 10 Staqe2 Report Final.pdf

4. Victorian Floodplain Management Strategy 2016, available at https://www.watervic.gov.aulmanaging- floodp1ains/new-victorian-floodplain-management-strategy

5. Corangamite Regional Floodplain Management Strategy 2018-2028, https://ccma.vic.gov.au/wp- content/uploads/2019/10/Coranciamite-RFMS-TEXT-for-WEB.pdf

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