Information Response - Email 1 of 2 MCU16/0153 & REC16/0041

Peter Gintrac

From:                               Adam McArthur <[email protected]>
Sent:                               Tuesday, 21 March 2017 10:02 AM
To:                                 Peter Gintrac
Cc:                                 Matthew Figg; Mark Dunleavy ([email protected])
Subject:                            170321 AM to PG RE: 215 David Low Way, Peregian Beach (162042 gen)


Hi Peter,

As you are aware, from an ecological perspective the two main concerns with stormwater discharge are Quality and
Quantity. The site occurs adjacent to a low-lying area of wet heath vegetation known locally as Emu Swamp, which
forms part of the Lake Weyba sub-catchment of the Noosa River catchment.

It is understood from our discussions that stormwater will generally be discharged from the site after cycling
through a bioretention system. This should adequately deal with the issue of Quality.

In relation the Quantity, issues can arise at the point of discharge (i.e. scouring, erosion, deposition etc.) or in some
cases more broadly through elevated water levels in adjoining habitat areas through increased peak flows. It is
understood from our discussion and your email below that scour protection would be in place at the discharge point
and that the velocity of the discharge would be controlled to ensure sheet flows from the site. This should
adequately deal with issues at the discharge point and closely mimic natural flows from the site.

With consideration of potential changes to hydrology in Emu Swamp as a result of increased peak flows from the
development, it is likely that any increase in flow volume to Emu Swamp would be negligible. This is because the
area within the subject site that drains into Emu Swamp forms an extremely small portion (likely less than 0.01%) of
the local catchment. The small increases in peak volume predicted to be discharged from the subject site would
therefore not be likely to elevate the water level in the Emu Swamp by any more than a few millimetres during peak
flows. This is not considered to represent a significant impact on the hydrology of the Emu Swamp.

Please don’t hesitate to contact me if you require any further information.

Regards,

Adam McArthur
Principal Ecologist / Group Operations Manager

                            T: 07 3219 9436 | F: 07 3423 2076 |M: 0467 099 119 | E: [email protected]
                            Suite B, Building 11, Garden City Office Park, 2404 Logan Road, Eight Mile Plains QLD 4113
                            www.jwaec.com.au | ABN 18 862 767 739




From: Peter Gintrac [mailto:[email protected]]
Sent: Monday, March 20, 2017 10:49 AM
To: Adam McArthur <[email protected]>
Cc: Matthew Figg <[email protected]>
Subject: 215 David Low Way, Peregian Beach (162042 gen)

Hi Adam,

As discussed, we would like your input with regards to the stormwater outlet from our development, in particular
the Stormwater Quantity aspect.


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