Technical Note in response to action notice

                                                               Ref No 20648-R1 – Rev 2

TECHNICAL NOTE IN RESPONSE TO COUNCIL DEVELOPMENT
COMPLIANCE NOTICE FOR NEW DWELLING AT 22 TURPENTINE ROAD
RINGTAIL CREEK

 I refer to Council’s letter dated 9th November 2020, reference COM20/0693
regarding outstanding development conditions for the second dwelling at the above
address. The two issues raised in this letter relate to stormwater/flooding conditions
and the construction of a second driveway. The purpose of this technical note is to
address these matters to the satisfaction of Council.

BACKGROUND DOCUMENTS

On 2 February 2018 Council issued a Referral Agency Response ref RAL17/0523
approving a Development Application for Building Works – Detached House
(secondary dwelling) at 22 Turpentine Road, Ringtail Creek (lot 2 RP846208).

Condition 8 & 9 of RAL17/0523 read as follows:

   8. The minimum floor levels of all habitable rooms must be the greater of the
      following:
          a. The minimum specified floor level if in an area where minimum floor
             levels are available
          b. 300mm above the modelled flood level if in an area where flood
             modelling is available
          c. 300mm above the highest known flood level if in an area where flood
             modelling is not available

   9. The development of the site (buildings, driveways, paths and landscaping)
      must not impede the existing overland flow of stormwater from the adjoining
      property or cause additional ponding on stormwater on any adjoining
      properties or the road reserve.

There is no mention in the conditions about the driveway requirements however the
approved plans show the secondary dwelling being accessed via an extension to the
driveway from the existing/main dwelling.

OVERLAND FLOW PATHS/STORMWATER MANAGEMENT

The subject lot is not located within a flood hazard zone and as such there is no
minimum specified floor level. Refer screen shot from Council flood hazard mapping
below. We are unaware as to whether there has been any flood modelling in this
specific location but suspect none exists. There is also no historical flood level to
determine the highest known flood. Notwithstanding the image below shows that the
flood hazard area extends to areas below RL 3.5-3.8 AHD (approx.)




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