Appendix J - Civil Engineering Report and SBSMP

                                                                                  Noosa Residential Development
                                                                            Ref: 24553 C R002 REV03 10.08.21.docx
                                                                                                     August 2021


5        STORMWATER INFRASTRUCTURE
5.1      Existing Infrastructure
         A DBYD search and detailed survey has identified the following stormwater infrastructure within the
         vicinity of the subject site:

            Existing Concrete Box Culverts, 4 x (600mm x 1200mm) traversing under 17-19 Hofmann Drive,
            Noosaville (Lot 3 on SP126203) to the southeast of the proposed development located within the
            stormwater covenant south of proposed LPD;
            Existing Council stormwater infrastructure consisting of 375mm stormwater pipes and gully pits
            external to 17-19 Hofmann Drive, Noosaville (Lot 3 on SP126203) traversing Hofmann Drive
            southeast of the proposed development; and
            Existing Council stormwater infrastructure consisting of DN300 stormwater pipes and gully pits
            external to 17-19 Hofmann Drive (Lot 3 on SP126203) near the north-eastern roundabout.

         Refer to Appendix A for the detailed survey for further information regarding the existing stormwater
         infrastructure.

         Note: Existing optical fibre cables are shown on the survey within the development area and are to
         be considered during detail design and construction stages.

5.2      Lawful Point of Discharge (LPD)
5.2.1    Existing LPD
         Based on information gathered via survey and contour data, aerial imagery and previous
         Development Approval investigation, it has been determined that the subject site discharges
         stormwater flows via overland flow to the stormwater covenant (Covenant J) as identified in the
         survey plan (refer to Appendix A) along the eastern boundary of the site, which feeds the culverts
         under Hofmann Drive as discussed above.

5.2.2    Proposed LPD
         The proposed primary LPD for the development is the same stormwater covenant as the pre-
         development case, which is consistent with the RAL application approved by P & E Court Order No.
         765 of 2020. As a part of the proposed subdivision works across the site (refer to Appendix H for
         associated civil plans) a stormwater connection is to be provided to each of the three (3) proposed
         lots that make up the development site. These connection points drain to the drainage covenant
         discussed previously. It is anticipated that as a part of the proposed building works these three lots
         will be amalgamated, and these existing connection points will be removed and replaced with outlets
         to suit the proposed development. These outlets primarily discharge directly to the open channel to
         the east of the site, though a portion of Catchment B3 will discharge to the kerb and channel in
         Hofmann Drive, which in turn discharges via existing gully pits to the same point as the drainage
         covenant on the far side of Hofmann Drive.

         Refer to Appendix C for the Preliminary Layout Plans prepared by this office.

5.3      External Catchment
         The proposed balance lot to the west of the site presently drains through the development area,
         along with a portion of the adjacent shopping centre service driveway. The approved subdivision
         plans prepared by Barlow Shelly (refer to Appendix H), indicates that the works associated with the
         proposed RAL (P & E Court Order No. 765 of 2020) will divert these flows away from the development
         area.



BRISBANE / SYDNEY / MELBOURNE / GOLD COAST / SUNSHINE COAST / DARWIN / PERTH                             Page 11