RFI - RECOR Preliminary Stormwater Management Report - 20220078

     2.3. Proposed Development Drainage Pattern

          2.3.1 Stormwater Concept
The internal stormwater drainage network will consist of a number of pits to provide collection points for upstream
run-off and enclosed courtyard areas draining under gravity to connect to the existing Council stormwater
infrastructure in Wyandra Street.

Roof run-off from the new building will be drained via downpipes into a stormwater attenuation tank. The tank is
sized to reduce the overall developed site flows to pre-development levels, ensuring discharge from the site
minimises any impact to the downstream environment.

Subsurface drainage from the retaining walls (designed by others) is to connect into the internal drainage system.
Surface drainage to intercept overland sheet flows at the top and base of excavations is to be considered by the
retaining wall designer, in accordance with SCG’s report.

The internal drainage will be conveyed and discharged into an existing kerb inlet pit on Wyandra Street as the lawful
point of discharge from the site.

The roof and allotment drainage system for the proposed site shall be designed to comply with:

     1. Noosa Shire Council Planning Scheme Policy (PSP) - Engineering Design Standards – Roads, drainage and
        earthworks;

     2. The Queensland Urban Drainage Manual (QUDM); and

     3. AS/NZS 3500.3:2015 - Plumbing and Drainage Part 3: Stormwater Drainage.

Refer to Appendix A Proposed Development Concept Plan for the proposed stormwater drainage layout plan
illustrating the concept described above.



     2.4. Flood Considerations
Review of the Noosa Shire Council Intramaps flood layers including the Flood Hazards Overlay has identified that
the site is located outside of any flood or inundation areas within the locality indicating it is not expected that that
the proposed development will be subject to flooding.




Project number 20220078
File RECOR Preliminary Stormwater Management Report - 20220078, 2022-11-11                                       Page 7 of 16
Revision 2


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