Slope Stability Report (rec. 16.04.25) · MCU25/0042

ROOF DRAINAGE


NOTES:

All work to conform with Part MP 4.2 of the                                                                                                                                                                                                                               600          1500                                                               7000
Queensland Development Code (QDC)
(Water Saving Targets).




                                                                                                                                                                                                                                                                                                                                                                                              6000mm setback




                                                                                                                                                                                                                                                                                                                                                                                                                 4500mm setback
Roof stormwater is to discharge to local
government requirements and approval.
Tank/s overflow and downpipes not
connected to rainwater tank/s to discharge




                                                                                                                                                                                                                                                          600




                                                                                                                                                                                                                                                                                                                                                                                                                                  600
to interallotment drainage system/ to
nominated discharge points via bubbler
system/ to discharge to street channel system.


Based on assumed 5 minute rainfall intensity -
258mm/h 20 years recurrence interval.




                                                                                                                                                                                                                                                                                                     line of upper level walls under
Gutters & downpipes shall be in accordance




                                                                                                                                                                                                                                                          5200
with AS/NZS3500.5 domestic & Part 3.5.2, Vol 2
of the NCC.

All downpipes to be 90mm/100mm U-PVC.
All gutters to be 150 Half Round Gutters
(7042mm² Cross section area).
Falls to be in accordance with clause 3.5.2.4,
Vol 2 of the NCC.

•     Effective roof catchment area (dwelling
                                                                                                                                                                                                                                                                                                                                            skylights
      only) 145 m²




                                                                                                                                                                                                                                                                                                                                                                                                                                  13700
•     Roof catchment per downpipe 50m²
•     Downpipes must not serve more than
      12m of gutter length for each downpipe
•     Total rainfall intensity 145m² X 258mm/50 =
      748.2L/min
•     Stormwater pipes - 100 dia. Laid at 1 in
      100 minimum grade.
Downpipes are to be located where they will                                                                                                                                                                                                                                                                                            Roof Catchment Area




                                                                                                                                                                                                                                                          8500
not create a hazard to building users nor                                                                                                                                                                                                                                                                                                     145m²
impede window & door openings and the
like.                                                                                                                                                                                                                                                                                                                                       kliplok roofing
                                                                                                                                                                                                                                                                                                                                                   3.0°
 They are to be installed as close as
practicable to the supporting structure while
maintaining termite inspection clearances of
                                                                                                                                                            1500mm setback

                                                                                                                                                                             2000mm setback

                                                                                                                                                                                              2500mm setback




25mm. Downpipes are to be protected from
potential mechanical damage, be installed
no less than 100mm from electrical cables &
gas pipes & no less than 50mm from other
services (AS3500.3.2 S4.11)




                                                                                                                                                                                                                                                          600




                                                                                                                                                                                                                                                                                                                                                                                                                                  600
Downpipes are to service 12m maximum                                                                                                                                                                           2500mm setback
gutter length & be within 1.2m from each                                                                                                                                                                       2000mm setback
valley unless overflow is provided for (NCC
Vol2 7.4.5)                                                                                                                                                                                                    1500mm setback                                             600                                                                     8500




                                                                                                                                                                                       Plan
                                                                                                                                                                                        Upper Level Pitching                                1 : 100




                                                                                                                                                                                                                                                                                                                                                                     No.                 Description                                          Date
                                                                                                                                            Project                                                                         Client                                 Drawing                                                                 Drawn by              A         Draft Issue A                                                  17/03/2025         Project number               Scale at A3
                                                                                                                                            19 Attunga Heights                                                              Bennett Residence                      ROOF DRAINAGE                                                           DRH                   B         Concept Issue B                                                20/03/2025
                                                   dennishillarchitect                                                                                                                                                                                             PLAN
                                                                                                                                                                                                                                                                                                                                                                                                                                                                      065                    1 : 100

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                                                         www.dennishillarchitect.com                                                                                                                                                                                                                                                                                                                                                                          CONCEPT.09
Do not scale from drawings. Dimensions are to be checked on site prior to commencement of work. Discrepancies to be brought to the attention of the author. Any dimensions not nominated must be referred to the Architect for confirmation. The concepts and information contained in this document are the copyright of Architect. Use or copying of the document in whole or in part without the written permission of the Architect constitutes an infringement of copyright.   20/03/2025 8:00:29 PM