Stormwater Management Plan · MCU15/0122

                                                                                 15099 - SBSMP/2
                                                                                          Page 24




8 CONCLUSION
The proposed development located at Cnr Val Crescent & Goodchap Street, Noosaville has been
assessed for its impact of the quantity and quality of stormwater runoff.

There are existing stormwater gully pits within Val Crescent adjacent to the site’s western
boundary. If the proposed development maintains pre-development flow conditions, the
existing stormwater infrastructure within Val Crescent is considered the legal point of
discharge.

Mitigation of increased stormwater runoff from the proposed site is required in order for the
post-development stormwater discharge conditions to match the pre-development conditions.
With the aid of XP-RAFTS, as recommended in the QUDM, a detention volume requirement of
76m3 has been determined to maintain pre-development peak flow rates for the proposed
development up to a Q100 storm event. This storage volume shall be provided within an
underground detention basin to be located within the southern region of the site.

Sediment generated during the construction phase shall be dealt with in accordance with an
Erosion and Sediment Control Plan to be maintained by Morgan Consulting Engineers and kept
on site during the construction phase.

As the development entails a material change of use for urban purposes, which will involve a
land area greater than 2,500m2, the State Planning Policy 2013 (SPP 2013) is triggered. The
water quality objectives (WQO’s) for South East Queensland can be achieved by treating the
roof and surface stormwater runoff from the proposed development prior to discharging to the
existing stormwater infrastructure within Val Crescent.

The subject site is not flood affected as indicated in Appendix G. Therefore, the proposed
development will achieve adequate flood immunity.




Site Based Stormwater Management Plan
Proposed Medical Development at Cnr Val Crescent & Goodchap Street, Noosaville