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¢ » Cardna
. MBK

 

5.0 SEWAGE TREATMENT AND DISPOSAL

Cardno MBK were provided with a brief to develop a sewerage system that would adequately
service the proposed development and clearly meet the environmental goals of the Noosa North
Shore Eco-Tourism Portal. These goals in the most generic form focus on the design and

- consirucition of a fit for purpose sewerage system that would be integrated within the site’s

physical and environmental constraints. The detailed design phase will place major emphasis
on meeting these objectives.

An analysis of the expected equivalent tenement (ET) that will be generated by the proposed
Noosa North Shore Eco-Tourism Portal was carried out. The final layout and composition of the
Noosa North Shore Eco-Tourism Portal will be determined at Development Permit stage. The
following assessment is based on the layout option presented in the illustrative plans included in
the Noosa North Shore Eco-Tourism Portal Development Code.

Table 5.1 below provides an indication of the equivalent population that is expected from the
proposed development of the western and eastern areas. The following assumptions have been
adopted for the calculation of the equivalent population levels.

A conversion rate of 0.5 ET per Eco-Cabin.

A conversion factor of 0.33 ETs per Lodge room.

An assumption of 3 ET for each of the Interpretive Centre and Café facilities has been
adopted for this report.

A conversion factor of 3.2 EPs per ET has been used.

ON =

a

The proposed conversion rate for the eco-cabins is deemed to be representative of the type and
nature of this development and the expected realistic occupancy rates that the Noosa North
Shore Eco-Tourism Portal will generate.

Table 5.1 : Equivalent Population Calculation

Eco-Cabins 90 cabins 0.5 ET/cabin 144

Ledge 80 rooms 0.33ET/room 5 85

Accommodation

| retive Centre 140 sq. metres 10

Café 130 sq metres 10
TOTAL EP 249

 

in order to ensure that there is an element of conservatism in the estimation of expected
equivalent population, the sewerage system and the proposed treatment plant will be
conceptually designed for a capacity of 350 EPs. Therefore should Nocsa Council request
higher conversion factors, these will be accommodated by the additional capacity design.

Table 5.2 details the corresporiding sewage flows that will be generated from the proposed
development. The following assumptions have been taken into consideration in the calculation
of the sewage flows.

i. Average Dry Weather Flow Rate (ADWF) -180 L/EP/day
2. Peaking factor ADWF — Peak Wet Weather Flow (PWWVF) of 5

It should be noted that the traditionally adopted ADWF rate of 225 L/EP/day is more indicative of
a typical residential lot with established gardens, which will not be the case in this proposed

 

PETRAC LAND HOLDINGS P/L Noosa North Shore Eco-Tourism Portal September 2003
LA7296-03\ReporliFINAL REPORT ~ 18Sept03.doc Commercial in Confidence Page 8