21598 - Glenridge Drive Development Application Engineering Report - draft

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Table of contents
Table of contents .............................................................................................................................. 2
1. Introduction ................................................................................................................................ 3
2. Proposed Development/Flood Assessment .............................................................................. 3
3. Access Road and Intersection................................................................................................... 3
4. Earthworks................................................................................................................................. 7
5. Conclusions and Recommendations ......................................................................................... 7
Appendix A – Locality plan ............................................................................................................... 8




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    1. Introduction
Tod Consulting has been engaged by the Mark Bain Constructions to prepare preliminary
engineering drawings and an engineering report in support of a proposed 8 lot rural residential
subdivision development application to Noosa Shire Council at 60 Glenridge Drive, Cooroibah.

The purpose of this report is to address the engineering infrastructure that will be required to service
the proposed development. This report was compiled using information from the following sources:

    •   Site inspection
    •   Dial Before your Dig (DBYD) information
    •   Google Imagery & Noosa Shire Council interactive mapping
    •   Detailed Survey provided Noosa Cooloola Land Surveys

Existing Property and Features:

The existing property is located at 60 Glenridge Drive, Cooroibah within the Noosa Shire Council
local government area. The total site area is 16.38 Ha and is described as Lot 47 on RP860577.
The location is shown in Appendix A

The site was previously used as a sugar cane farm and contains one existing dwelling and some
ancillary buildings. The topography of the site is very flat with parts of it subject to flooding.

    2. Proposed Development/Flood Assessment
The proposed development is for an 8 lot rural residential subdivision. The proposed lots will be
accessed via a new road intersecting with Glenridge Drive and terminating with a cul-des-sac.

As outlined in the Flood Assessment Report prepared by Peak Urban, the development is subject
to flooding with the proposed road crossing one of the overland flow paths through the site. Flood
relieving culverts will be provided at this crossing point. Please review to the Flood Report for details.
Stormwater runoff from the new road will be conveyed using open drains to this gully crossing point.

    3. Access Road and Intersection
The proposed new road intersects with Glenridge Drive, which is rural local street generally 6m
wide with a posted speed limit of 60kph. The new intersection is located approximately on the mid
point on the outside of the bend along the frontage of the lot. (approx. 77m from the northern
boundary).

The safe intersection distance (SISD) for vehicles exiting the new road, when taken 3-5m back
from the nominal edge line for a 70kph speed limit is 141-151m as per the normal design
requirements in table 3.2 of Austroads Part 4A – Guide to Road Design – Part 04A – Unsignalised
and Signalised Intersections. The visibility to the south-east is slightly impacted by the property
boundary and vegetation on the opposite side of Glenridge Drive resulting in a sight distance of
135m – measured along the line of the road. The visibility to the north is slightly obstructed by
vegetation on the eastern side of Glenridge Drive within the Council reserve meaning the
available visibility is in the order of 105m. However, it should be noted that given this is an existing
street Extended Design Domain standards can be adopted which would reduce the visibility
requirements to between 100 and 110m. The visibility in both directions exceeds the EDD sight
distance requirements. In addition, it should be noted that as the predominant traffic movements
will be left turns out of the new road, the visibility to the north is less critical. A site check has
confirmed that no clearing of existing vegetation is required – refer photos below, although some
minor pruning would increase the sight distances by a small amount.



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Sight Visibility to the East of proposed intersection shown below




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consulting engineers
Sight Visibility to the East of proposed intersection shown below

 

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Sight Visibility to the North of proposed intersection shown below




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consulting engineers
Sight Visibility to the North of proposed intersection shown below

 

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There is an existing access into the property on McKinnon Drive that is used to access a storage
area within the site. This access would be removed as part of the development. Refer photos
below.




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Preliminary engineering design drawings have been prepared showing the new road, intersection,
and drainage.

A cul-de-sac radius of 9m has been adopted as per Noosa Planning Scheme Policy section
SC6.7.5 1. (n).



    4. Earthworks
Some minor filling is required on lot 1 to provide a flood free building envelop. This would be
provided as part of the Operational Works. This minor filling has been accounted for in the flood
modelling. The remainder of the building envelops are all located in flood free areas on the site,
however minimum floor heights above the natural ground level will be needed to achieve a
minimum 500mm free board above the flood level. No building pads are proposed on these lots as
they can be constructed (if necessary) by the future owners to suit their preferred house site within
the building envelop. This has been noted on the preliminary drawings.



    5. Conclusions and Recommendations

The preliminary plans along with this report demonstrate that the proposed development can be
serviced and designed to meet Council engineering design standards


Prepared by




Doug Reynolds
RPEQ 9072
TOD Consulting Pty Ltd
6 December 2021




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Appendix A – Locality plan




        Locality Plan (Sourced from Noosa Council interactive mapping)




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