21598 - Glenridge Drive Development Application Engineering Report - Rev B

    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 site 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.
The new road will remain trafficable during the major storm event as outlined in the flood
assessment report. The vertical and horizontal alignment of the new road meets Council design
standards.

    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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