Revised Stormwater Mangement Plan

65-67 Elanda Street, Sunshine Beach
Site Based Stormwater Management Plan
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Currently, no stormwater discharge outlet point for the existing dwelling is observed along
the kerb and channel, it is assumed that the stormwater runoff from the development site is
currently discharged to the ground, and flows to the rear of the site as sheet flow.

No information of acid sulphate soil is obtained for the development site. However, given
the site is on an elevation far higher than 5m AHD, it is deemed that the acid sulphate soil
risk here is minimal.




1.4.3 Proposed Land Use and Stormwater Discharge
The existing house and hardstand areas are to be removed, and four (4) townhouses with
associated driveways are proposed for the development. The site dwelling density is approx.
39 dwelling/Ha (i.e. 4 dwellings/0.1020 Ha).

Considering the site dwelling density is over 20 dwelling/Ha, which falls within urban
residential high-density category in QUDM. Based on this the, the minor storm event is 10%
AEP. The site configuration is further detailed in Table 1.2.

A series of field inlet pits and underground stormwater pipe are proposed to collect the roof
water from the below-ground detention tank. Stormwater runoff from the site is proposed to
be discharged to the proposed soakage trenches located at the rea of the property, as
shown in Appendix E.

Table 1.2 Detailed site configuration

            Roof surface area         Landscape area       Driveway area   Total area (ha)
                  (ha)                     (ha)                (ha)
                 0.0500                   0.0325              0.0195           0.1020




File Name:            WCD-22936 – 65-67 Elanda_SWMP.docx
Revision:             E                                                                      7