attention: giuditta de santis · attention: giuditta de santis dear giuditta, 2 gough street,...

06-11-2019

30N-18-0252-TNT-6753921-2 Commercial-In-Confidence of 15

Vipac Engineers and Scientists Limited

279 Normanby Rd, Port Melbourne, VIC 3207, Australia

Private Bag 16, Port Melbourne, VIC 3207, Australia

t. +61 3 9647 9700 | f. +61 3 9646 4370 | e. [email protected]

w. www.vipac.com.au | A.B.N. 33 005 453 627 | A.C.N. 005 453 627

Caydon Cremorne No 2 Development Pty Ltd 06-11-2019

Level 2, 436 Johnston Street Ref: 30N-18-0252-TNT-6753921-2

Abbortsford, 3067,

Attention: Giuditta De Santis

Dear Giuditta,

2 Gough Street, Cremorne - Stage 2

Vipac Engineers & Scientists Ltd was commissioned by Caydon Cremorne No 2 Development Pty Ltd to

carry out wind tunnel testing to determine the likely pedestrian level wind conditions for the proposed

development at 2 Gough Street, Cremorne - Stage 2. Wind tunnel testing was conducted in 2016.

Section 72 Amended Application Plans (December 2018) were provided to Vipac in October 2019 and

compared to the original 2016 design and wind tunnel test results.

The building was tested in 2016 using scale model wind tunnel testing of the proposed development and

surroundings to determine a quantitative description of the wind environment adjacent to the building. By

comparing the amended scheme to the design that underwent wind tunnel testing, we can determine the

effect of these changes on the pedestrian wind environment adjacent to the development. The massing of

the design has changed since the wind tunnel testing was undertaken; however, based on our experience

as a wind engineering consultancy and the results of the testing, we can determine the likely wind

environment with the updated design.

The main points to note from a wind environment perspective are:

The massing of the development has changed significantly. The development now presents a

wider mass to the west up to Level 14, whereas the tested design had a higher 20 level tower to

the south and lower 6-level tower to the north (refer Figure 1 - Figure 10). The increase in mass

facing to the west would be expected to result in an increase in vortex shedding effects into Gough

Street. However, the reduction in height would be beneficial from a wind environment perspective,

as would the openings between the buildings allowing northerly winds to pass through, rather than

be directed to building corners. As such, we expect that the overall wind environment would be

similar to that measured in the original test.

The south tower form has changed with the silos retained and a separation introduced between the

tower and the silos (refer Figure 5 - Figure 10). The openings between the buildings allowing

northerly winds to pass through, rather than be directed to building corners would be expected to

be beneficial from a wind environment perspective.

Caydon Cremorne No 2 Development Pty Ltd


Wind Impact Assessment

06-11-2019


The maximum height of the building has reduced significantly from 20 levels (60.85 m) to 14 levels

(47.37 m) (refer Figure 11 & Figure 12). The reduction in height would be beneficial from a wind

environment perspective

The B6 tower shape has not altered significantly. The height of the building has reduced

significantly from 20 levels (62.85 m) to 14 levels (42.5 m) (refer Figure 13). The reduction in height

would be beneficial from a wind environment perspective.

We recommend that the landscaping from the wind tunnel test report 30N-15-0100-TRP-392316-0 be

incorporated into the design. The recommended parapet would no longer be required as the communal

terrace on Level 2 has been removed.

The outdoor café seating area to the north of Building B5 was found to have wind levels within the sitting

comfort criterion for the proposed design without landscaping, and would be expected to have similar wind

conditions with the updated design.

Considering that the general wind environment is expected to be similar to that measured in the original

wind tunnel test, Vipac recommends wind tunnel testing be undertaken to verify these assessments during

the endorsement process.

It should be noted that the VCAT Approved Plans (2017) were also provided and compared to the

amended 2018 scheme in separate Vipac document 30N-19-0252-GCO-6768727-1. As detailed herein,

since originally lodged, the massing of the development has changed significantly; however, the design has

not changed substantially since the amended plans that formed part of the approval as granted by VCAT.

Yours sincerely,

Vipac Engineers & Scientists Ltd

Sophie Lamande Dr. Zhuyun Xu

Wind Group Leader Senior Wind Engineer




06-11-2019


Attachments:

Figure 1: Ground floor plans for the Section 72 Amended Application Plans (Dec 2018)

Section 72 Amended

Application Plans

(Dec 2018)




06-11-2019


Figure 2: Ground floor plans for the design tested in the wind tunnel

B8

B6

Original Design

(2016)




06-11-2019


Figure 3: Level 2 plans for the Section 72 Amended Application Plans (Dec 2018)

Section 72 Amended

Application Plans

(Dec 2018)




06-11-2019


Figure 4: Level 2 plans for the design tested in the wind tunnel

B8

B6

Original Design

(2016)




06-11-2019



Section 72 Amended

Application Plans

(Dec 2018)




06-11-2019



B8

B6

Original Design

(2016)




06-11-2019



Section 72 Amended

Application Plans

(Dec 2018)




06-11-2019



B8

B6

Original Design

(2016)




06-11-2019



Section 72 Amended

Application Plans

(Dec 2018)




06-11-2019



B8

B6

Original Design

(2016)




06-11-2019


Figure 11: B8 West elevations – comparison between design tested in the wind tunnel and the Section 72 Amended Application Plans (Dec 2018)

57.55 m

47.37 m

Original Design

(2016) Section 72 Amended

Application Plans

(Dec 2018)




06-11-2019


Figure 12: B8 North elevations – comparison between design tested in the wind tunnel and the Section 72 Amended Application Plans (Dec 2018)

57.55 m

47.37 m

Original Design

(2016)

60.85 m

Section 72 Amended

Application Plans

(Dec 2018)




06-11-2019


Figure 13: B6 North elevations – comparison between design tested in the wind tunnel and the Section 72 Amended Application Plans (Dec 2018)

62.85 m

42.5 m

Original Design

(2016) Section 72 Amended

Application Plans

(Dec 2018)

attention: giuditta de santis · attention: giuditta de santis dear giuditta, 2 gough street,...

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