20220171 - 14 Wyandra St SWMP

     2.3. Proposed Development Drainage Pattern

          2.3.1 Stormwater Concept
Roof run-off from the new building will be drained via downpipes into a stormwater re-use and attenuation tank for
each unit. 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. A 5kL tank is proposed, with 2kL allocated for
rainwater reuse and the remaining 3kL serving to attenuate the site run-off.

A stormwater infiltration pit will be provided to each unit to which the overflows from the rainwater tank will be
discharged. Initial run-off will be infiltrated to replenish groundwater and reduce run-off from the site. The excess
run-off will be discharged to the Wyandra Street kerb and gutter system draining under gravity to new kerb adaptors
to be provided for each unit.

The remaining typically pervious areas of the site will drain as overland surface flows infiltrating into the site soils
consistent with the current drainage conditions.

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 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 20220171
File RECOR Preliminary Stormwater Management Report - 20220171.docx, 2022-08-24                                Page 6 of 15
Revision 1


P +61 7 5211 1003                 A 75 Noosa Drive, Noosa Heads,Qld 4567          E [email protected]    recorconsulting.com