Town Planning Report · REC15/0011

                                                                                                        Town Planning Report
                                      Development Permit for a Reconfiguration of a Lot (1 Lot into 11 Residential Lots and 1
                                                                                                 Balance Environmental Lot)
                                                                                                     1 George Street, Tewantin



4.2.3      Flooding

A Flooding Impact Assessment has not been prepared in relation to the development potential of the subject
land. It is noted that although the subject land is located adjacent Wooroi Creek and is partly mapped by
Council’s Planning Scheme as being in a Flood Hazard Area and also an Area Subject to Minimum Floor
Height, the proposed residential allotments are located well above this mapped / affected area.

Of additional note, the Proposal Plans clearly demonstrate that the new residential allotments and the proposed
drainage lot (Lot 900) are offset at least 40m from surveyed highest astronomical tide of Wooroi Creek. The
proposed residential allotments are also predominantly located above 5.0m AHD; likewise, the proposed
drainage lot (Lot 900) is located above 4.0m AHD.

The State’s ‘Coastal Hazard Areas’ Map shows the subject site as being partly included in a ‘Medium hazard
area (less than 1.0m water depth)’, the boundary of which appears to coincide approximately with the 2m AHD
contour. The previous owner, who until very recently resided on the property for most of her life (she is over 70
years old), showed us the highest points on the ground to where the water has risen in high rainfall or ‘flood’
events; these points just happen to coincide very closely with the 2m contour, so it would seem that the “less
than 1.0m water depth” declared on the mapping is definitely conservative. Furthermore, it should be noted that
all of the proposed residential allotments, as well as the proposed balance lot (Lot 900), are located well above
the top of bank, which is generally at about RL 4.0m AHD.

It is therefore contended that sufficient flood immunity is provided to the proposed residential allotments and
proposed drainage lot (Lot 900) to comfortably comply with Council requirements.

4.2.4      Acid Sulphate Soils

The subject land slopes gently down to the south, away from George Street, towards Wooroi Creek and its
tributary. The highest part of the site is at an approximate RL of 8.5m AHD, whilst the majority of the
‘developable area’ is situated above RL 5.0m AHD.

The proposal plans clearly demonstrate that the majority of the proposed residential Lots 1 to 11 lie wholly
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above 5.0m AHD and any excavation or filling work is not anticipated as being in excess of 100m . As such, the
proposed development is exempt from assessment against the Natural Hazards Overlay Code (with respect to
Acid Sulphate Soils) pursuant to Table 13.7 of the Planning Scheme.

It is noted that proposed Lot 900 as shown on the Proposal Plans is intended to accommodate two stormwater
bio-retention basins. Whilst the location of these basins is below 5.0m AHD, it is not anticipated that excavation
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works associated with them will exceed 100m or more of material. As such, the proposed development is
exempt from assessment against the Natural Hazards Overlay Code (with respect to Acid Sulphate Soils)
pursuant to Table 13.7 of the Planning Scheme.




PR122205-3: Ver. C – 19/06/15
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