RFI -21-10-13 - 20169 - RFI Response

Our Ref: 20169
Council Ref: MCU20/0150.01

Wednesday, 13 October 2021

Noosa Shire Council
PO Box 141
Tewantin QLD 4565

Attention: Patrick Murphy

RE:       Information Request Response – Bioretention Basin Design, Rainwater Tanks, Flow
          Concentration and Climate Change
          Proposed Townhouse Development at 101 & 105 Eumundi Noosa Road, Noosaville

In reply to the information request issued by Noosa Shire Council on 20 September 2021, we
provide the following information and response:

Item 1:       Demonstrate how PO7, AO7.1, PO9 and AO9.2 of the Water Quality and Drainage
              Code will be achieved. In particular, how visual integration, safety and
              maintenance access are achieved in the proposed design.

Response: Refer to the updated Stormwater Management Details (20169-SK12-D and 20169-
          SK13-D) attached to the updated Site Based Stormwater Management Plan
          (20169-SBSMP-Rev 4) which incorporates a 1 in 4 maintenance access ramp for
          each bio-retention/detention basin for maintenance staff to access the base of
          each basin. In accordance with Table 13 of the Bioretention Basin Technical
          Design Guidelines by Water by Design, catchments less than 2ha do not require a
          sediment forebay. However, scour protection has been provided at the inlets
          into the basins. It is anticipated that a safety fence will be installed around the
          perimeter of each basin and a lockable gate located at the maintenance access
          ramp to prevent public access. In addition, education signage will be installed at
          each basin location to inform the residences of the function each basin provides.
          Refer to the landscape architectural drawings for the proposed landscaping
          design surrounding the basin areas.

Item 2:       Update the SWMP to state all assumptions regarding the rainwater tank and
              reuse, including a plan showing communal landscaped areas intended to be
              irrigated. This is required so that hydraulic services plans can accurately reflect
              the SWMP intent.

Response: Refer to section 6.3.2 of the attached updated Site Based Stormwater
          Management Plan (20169-SBSMP-Rev 4) outlining the landscaping areas of the
          site that the rainwater tank is intended to irrigate.

 D:\JOBS\20-Jobs\20169 - 101 & 105 Eumundi Noosa Road, Noosaville\Civil\Correspondence\Letters\21-10-13 - 20169 - RFI
Response.doc