2008/0169 Response to information request - 71 Seaview Tce Sunshine Beach · 132008.169

                                               Figure 10 - Carpark GPT Locations


    5.0 CONCLUSION

    The SBSMP developed by JFP aims to determine the consequences of the development on local stormwater flow
    conditions with special regard to changes in stormwater quantity and quality post development. Revision D to the
    original SBSMP is a direct response to the SCRC Information Request as detailed in Appendix A.


    The SBSMP provides significant reductions in post development stormwater runoff quantity entering the natural
    gully to the east of the subject site. This has been achieved by implementing a 60kL underground stormwater
    storage system within the site. The underground stormwater storage system was developed and analysed in the
    XP-SWMM software package and was designed to have adequate storage volume to detain the required portion
    of flow for all ARI storm events. The outlet from the system has been designed to ensure the flow from the site
    will not be greater than that occurring under existing conditions. The final location and outlet properties of the
    system will be determined at the operational works stage of the application.


    Stormwater runoff from adjoining properties to the west will be captured and conveyed via an open drain running
    parallel to the western site boundary. The open drain will have multiple grated inlets to collect and discharge the
    flow at the north-western corner of the site. All outlets within the site will have adequate scour protection to
    ensure flows are dissipated and spread prior to discharging from the site.


    Runoff from the driveway / carpark will be treated through a GPT device (including a grease and oil separator) to
    ensure water quality standards are achieved for the site.


I
     SITE BASED STORMWATER MANAGEMENT PLAN - Revision D                          e Beach                             14