Appendix 4. Civil Engineering Report [As Published] · 132007.2399

4.0

STORMWATER DRAINAGE & WATER QUALITY

All current catchments within the Noosa Springs Golf Course currently
discharge into the existing Noosa Springs lake system prior to discharge into
Lake Weyba. This proposed development has been included in the original
stormwater modelling for the site and is included in the assessment to ensure a

non worsenings case.

It is intended that all catchments upstream of the new development will be
contained with swales external to the site and directed towards the overland
flowpath through the site. The majority of these flows will be collected by pits
and pipework through the site to discharge into Lake B at the western boundary

of the site.

The new stormwater systems to be extended through the site will utilise RC
pipework and standard inlet pits. Roofwater, surface runoff and road drainage
will be connected to the proposed pipe network grated. Proposed roadways will
be constructed with centrally located pits. Swales will also be utilised along the

road corridors to assist with the overall water quality treatment process.

All stormwater drainage collected from within and upstream of the site will be

treated by the use of GPT’s prior to discharge into the existing lake system.

Where possible within the development and upstream, swale drains will be
utilised to provide infiltration of runoff into the underlying sand strata. This will

also assist in the treatment of the first flush from roadways.

 

C1732-07-Engineering Report Page 3 of 10
NOVEMBER 2007 IF/ca

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