20517 App J.pdf [As Published] · 132007.1259

Concept Stormwater Management Plan
Essence of Peregian

 

4.0 STORMWATER QUALITY
41 Stormwater Quality Management Strategy

 

As there is potential increased pollutant loads to enter natural waterways as a result of the development, a treatment
train of suitable Stormwater Quality Improvement Devices (SQIDs) has been proposed to mitigate this increase. The
locations and distribution of these devices are shown on Drawing No. B07047-SK01 in Appendix A. The treatment
train will incorporate the following devices:

e Vegetated Swales ~ Swales will collect and drain surface runoff to the wetlands. They could also convey
overflow from accommodation building rainwater tanks to wetlands. Overflows from wetlands would also
drain via vegetated swales to discharge points at the western edge of the beach shack area.

© Bio-Filtration Basins - Two bio-filtration basins will treat stormwater runoff.

One basin will treat runoff from the proposed Commercial site, the Peregian Beach Hotel site and the
section of David Low Way that drains via the Council piped stormwater system south of the site. This basin
is to be located at the western end of the proposed road extension at the south end of the site. Treatment
of an external catchment (Peregian Beach Hotel and part of David Low Way) is proposed to improve the
runoff to Noosa National Park in addition to improving site runoff. External catchment pipelines either pass
adjacent to or through the site. It is considered feasible to reconfigure these pipelines near discharge
points or where they pass through the site. Detailed investigation and design will be submitted at
Operational Works stage.

The other bio-filtration basin will treat runoff from the entrance roadway within the site boundary. Bio-
filtration devices act to remove fine sediment and reduce nutrient concentrations.

e Ephemeral Wetlands - Shallow wetlands will be located within the site to treat overflow from
accommodation building rainwater tanks and runoff from the surrounding ground level areas.

« Rainwater Tanks - Two above-ground rainwater tanks are proposed for each beach shack. One
underground rainwater tank is proposed for each of the northern (Buildings C1 and B3), central (Buildings
A2 and B2) and southern (Buildings A1 and B1) accommodation buildings. These tanks will reduce runoff
volumes by reuse. Reuse will also assist in meeting water quality objectives by reducing contaminant loads
entering the stormwater system.

4.2 Pollutants of Concern / Water Quality Objectives
42.1 Regional Water Quality Guidelines

The Noosa River Environmental Values and Water Quality Objectives are outlined in the Environmental Protection
(Water) Policy 1997, published by the Queensland Environmental Protection Agency. The document applies to
waters within the Noosa basin. The geographical extent of waters addressed by the document is shown in Waters of
the Noosa River Catchment and Teewah Coastal Catchment plan (Plan WQ1401, Version 100206).

Upon inspection of the plan, the Level of Aquatic Ecosystem Protection for the subject site is found to be within the
‘High Ecological Value fresh waters’ area (Code NF1). The Noosa River Environmental Values and Water Quality
Objectives document states that there is insufficient information available to establish current water quality for waters
within Area NF1. Reference is then made to the Queensland Water Quality Guidelines (2006). Reference to
Section 2.5.1.2 of these guidelines shows that the specific waterway for the subject site is not specified in Table

 

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