Further Information required

Subject: FW: Further information required REC13/0146 - 55 Lake Macdonald Drive.
From: Glen Conforti <[email protected]>
Date: Mon, 21 Jul 2014 00:04:23 +0000
To: "[email protected]" <[email protected]>

#ECMBody

Regards

Glen Conforti
Planning Technical Officer I Noosa Council

Phone:                    07 5329 6241
Email:        [email protected]<mailto:[email protected]>
Website:    www.noosa.qld.gov.au<http://www.noosa.qld.gov.au/>
Location:   Level 2, 9 Pelican Street, Tewantin
Mail:          PO Box 141 Tewantin Qld 4565

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From: Glen Conforti
Sent: Friday, 18 July 2014 5:01 PM
To: [email protected]
Cc: Mark Lewis; Conor Neville; Cherie O'Sullivan
Subject: Further information required REC13/0146 - 55 Lake Macdonald Drive.

Hi Max,
Further to our discussion earlier in the week, the third party review of the Stormwater Detention and Flooding Report by BSM  raised some concerns. These concerns are outlined below:

1.       The report details that in a Q100 event an additional 1,585m³ of storage is to be provided. Only 252m³ 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.
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.
3.       The 100m 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.
4.       The western tributary is a minor waterway for fish passage. Given the extent of works in the waterway and the proposed works are an integral part of the modelling, Council recommends the applicant gain written support from DAFF for the proposed works.
5.       Please confirm that the maximum flow through the bio retention swales in a Q100 event do not exceed 1.0m/s in accordance with Healthy Waterways Design Guidelines.
6.       Please confirm Q100 flood depths over the footbridge. It is unclear of the blockage factor that  has been applied to the bridge and handrail and its impact on flood levels.
7.       The hydrologic regime is proposed to be changed over 2 Pearson's road in a minor event. Please provide owners consent from 2 Pearsons Road for this change to hydrological flows on their property.
a.       No comment on the  environmental impact of this (2 Pearsons Road) change to the hydrological flow has been provided.



Regards

Glen Conforti
Planning Technical Officer I Noosa Council

Phone:                    07 5329 6241
Email:        [email protected]<mailto:[email protected]>
Website:    www.noosa.qld.gov.au<http://www.noosa.qld.gov.au/>
Location:   Level 2, 9 Pelican Street, Tewantin
Mail:          PO Box 141 Tewantin Qld 4565

[Description: Description: Description: cid:[email protected]]

Please consider the environment before printing this email