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7.0 STORMWATER MANAGEMENT

7.1 Preamble

The two precincts of the development where accommodation is to be constructed are referred to
as the East Visitor Precinct and the West Visitor Precinct.

Potential impacts of the two precincts were assessed using the program AQUALM (XP
Software) with established parameters described in Brisbane City Council’s “Guidelines for
Poilutant Modelling in Brisbane’, Version 6, October 2000.

The proposed development does not alier existing drainage paths, which generally exit the
development site on the northern and eastern sides. Catchment boundaries and ground level
contours are shown in Figure 6. The nearest open water body is Lake Cooroibah, which is
located some several kilometres downstream with extensive wetlands located between it and
the proposed development. :

Given the size of the water catchment and the topography of the site, it is envisaged that there
will be no flooding issues associated with the proposed Noosa North Shore Eco-Tourism Portal.

7.2 Rainfall and Pan Evaporation Records

The site lies at the following coordinates:

E 504792 N 7085488
Lat -26° 21’ Long 153° 03’

A synthetic daily rainfall series was generated by combining rainfail records from nearby rainfali
stations; the nearest being 040757 Lake Cooroibah. The series extended from 1972 to 1998,
which is the longest series that can be input into AQUALM. The rainfall series had a mean
annual rainfall of 642mm.

Mean monthly pan-evaporation data were obtained from the nearest pan evaporation station —
number 040420, Coolum Bowls Club, which had a mean annual pan evaporation of 1785mm

7.3 East Visitor Precinct

The proposed East Visitor Precinct comprises the construction of approximately 90 eco-cabing
within an existing forest over an area of approximately 22.0ha. The eco-cabins are dispersed
amongst the existing trees, and access roads will generally follow established tracks. Currently,
the forest is used as forage for the camels in the adjacent camel trekking venture, which has
somewhat denuded the under-storey.

The proposed eco-cabins are to be consirucied with rainwater tanks, which will significantly
reduce runoff and pollutant exports from the site. Access tracks are to be constructed with no
kerb ahd channel. Road drainagé channels are to be‘vegetated with native species of locai
provenance, which will provide effective filter strips for water quality treatment purposes. A
schematic of the proposed arrangement of filter strips is shown in Figure 7.

The sandy nature of the site will also provide some infiltration for surface water, though the
subsoil in lower areas of the land is not entirely free-draining as evidenced by the existing
wetlands and dams in the vicinity.

 

PETRAC LAND HOLDINGS P/L Noosa North Shore Eco-Tourism Portal September 2003
LA7296-03\ReportiFINAL REPORT - 18Sept03.doc Commercial in Confidence Page 22