18164 - SBSMP - Rev 0

                                                                                          18164 - SBSMP/0
                                                                                                   Page 8




5 STORMWATER QUANTITY
A roof and allotment drainage system has been designed to comply with:

    1. AS/NZS 3500.3:2015 - Plumbing and Drainage Part 3: Stormwater Drainage;

    2. The Queensland Urban Drainage Manual (QUDM), and;

    3. The Noosa Plan Planning Scheme Policy PSP05.


5.1 Detention Assessment
The Stormwater Management Plan (SMP) prepared by SLR Consulting dated March 2018 (Ref No.
620.12292-R01) details a proposed detention tank arrangement required to ensure that the
proposed development will not worsen peak outflows from the proposed development area. The
detention requirements of the aforementioned SMP have been incorporated into the Siteworks and
Drainage Plans prepared by Morgan Consulting Engineers.

Refer to Appendix D for the Siteworks and Drainage Plans and Section 6 for the Stormwater
Quality Management assessment.


5.2 Proposed Drainage Patterns
The proposed drainage patterns are as follows (refer to Appendix D for the Siteworks and Drainage
Plans):

Roof Catchment:
    1. Roofwater runoff from each proposed residential dwelling will flow via downpipes to a 3kL
       water reuse tank with overflow to the internal drainage network, where it will be directed
       to an underground detention tank prior to being discharged to the Lawful Point of
       Discharge.
    2. First flush roofwater runoff from the proposed hotel building will flow via downpipes to
       the internal drainage network, where it will be directed to an underground detention tank
       prior to being discharged to the Lawful Point of Discharge.
    3. Roofwater runoff from the proposed hotel building, exceeding first flush, will flow via
       downpipes to an underground 200kL water reuse tank, with overflow directed to an
       underground detention tank prior to being discharged to the Lawful Point of Discharge.

Ground Catchment:
    1. Surface runoff from the proposed residential properties and road surface will be collected
       by the internal drainage network, where it will be directed to an underground detention
       tank prior to being discharged to the Lawful Point of Discharge.
    2. Surface runoff from the proposed hotel development will be collected by various
       stormwater pits and flow to an underground 200kL water reuse tank, with overflow
       directed to an underground detention tank prior to being discharged to the Lawful Point
       of Discharge.




Site Based Stormwater Management Plan
Reconfiguration of a Lot and Mixed Use Development at 215 David Low Way, Peregian Beach