Response to Info_Request_sept2014

Callaghan & Toth Consulting Engineers Pty Ltd
ABN No. 45140292324

  
   
  

8/41 Sunshine Beach Road Noosa Junction

P.O Box 2305 Noosa Heads 4567 Callaghan & Toth
www.callaghanandtoth.com.au oa ; F P
Civil, Environmental & Hydraulic Engineers

Ph: 07 5474 9081 Fax: 07 54749041
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22" September 2014

Glen Conforti

Development Planning Officer

Noosa Council

Via Email: [email protected]

RE: Response to Information Request for Application to Reconfigure a Lot — 3 Lots
into 18 Lots REC13/0146

In response to the emailed Information Request dated 18 July 2014 the following details are
offered:

Flood Storage

1. The report details that in a Q100 event an additional 1,585m? of storage is to be
provided. Only 252m? is proposed to be provided in detention basins and the balance
has been created by floodplain roughness via the planting of vegetation. This
equates to nearly 85% of the storage to rely on vegetation plantings. Council will not
accept this form of detention.

Response:

Please refer to Brisbane Stormwater Management (BSM) response on page 5 of the updated
study dated 15-9-14.

Flood Afflux Upstream of Site

2. The report outlines 50mm of afflux upstream in a Q100 event relying on externalities
to the site for justification. Any afflux will not be supported.

Response:

Please refer to Brisbane Stormwater Management (BSM) response on page 6 of the updated
study dated 15-9-14.

Flood Impact
3. The 100mm impact reported at Node 29 results in localised peak flood level impacts

at 2 Pearson’s Rd. Agreement by the owner should be provided acknowledging the
flood impact on their property.

Response:

Please refer to Brisbane Stormwater Management (BSM) response on page 6 of the updated
study dated 15-9-14.

X:\JOBSI\CT Projects in progress\1225 30 lots lake MacDonald Drive\Correspondence\stage 3 & 4\Response to Info_Request_sept2014.doc