20220214 12 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. 2kL tank of attenuation will be provided to each
unit to achieve the required peak flow reduction from the site.

Stormwater inlets and piped drainage will be provided to capture of surface run-off as well as provide connection
points for the outlets from the attenuation tanks. Grated trench drains will be provided in front of the garages to
intercept driveway run-off.

Stormwater run-off from the adjacent upstream property will be controlled by local grading along the boundary to
fall surfaces to drain towards the pits along the eastern boundary.

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.

All run-off from the piped drainage within the site will be discharged via new kerb adaptors outlets at the downstream
kerb frontage as the lawful point of discharge.

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.




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Project number 20220214
File 20220214 12 Wyandra St SWMP.docx, 2022-09-14 Revision 1
P +61 7 5211 1003                A 75 Noosa Drive, Noosa Heads,Qld 4567   E [email protected]    recorconsulting.com