Engineers correspondence · MCU15/0014

7 April 2015
SCG Ref: 25133(L1)

By Email: ([email protected])


Kidd & Co Designers




Dear Sirs

                      Re: Proposed Development – 279 Gympie Terrace, Noosaville

We confirm receipt of Councils recent Information Request for the above proposal dated 17 March 2015.

We have reviewed the request with regard to the engineering requirements and provide our response in the
form of this letter and enclosed drawings.

ISSUE - STORMWATER

We have enclosed a copy of our proposed Site Stormwater Drainage plan (No. 25133-C1) for the site.

A non- worsening assessment has been conducted for the development with the results presented on our
drainage plan. They confirm a marginal increase in site stormwater runoff due to the increase in impervious
areas.

With regard to the requirement for potential on-site detention of this increase, we are of the opinion that the
catchment which contains the site would be better served with the site draining un-detained. The site is
located at the downstream end of the catchment and its runoff should ideally drain through the council’s
system before the catchments peak upstream flows arrive at its downstream end.

Regardless of this opinion, we are proposing to install a series of Atlantis drainage cells to promote
infiltration of the captured stormwater within the site whilst also providing some level of peak flow offsets via
the initial in-ground storage provided within the cells. The sites sandy soils are well suited to this method and
better replicates the current drainage characteristics of the site.

With regard to the potential for ponding occurring on neighbouring properties from filling within the site, we
have proposed a series of in-ground pipes to drain potential ponding areas. These have been shown on our
Site Stormwater Drainage plan (enclosed).

ISSUE - CARPARKING

It is understood that Kidd & Co Designers are providing details of the proposed car stacking system
addressing Item 2 of council’s request.

We have provided vehicle turning templates that demonstrate adequate vehicle maneuverability for the
proposed parking arrangements which addresses items 3 & 4 of the council’s request.