20517 App K.pdf [As Published] · 132007.1259

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3 Water Supply

3.1 Design Criteria

The reticulation network has been assessed based on design criteria, which are in general
consistent with the Water Resources Commission Guidelines for Planning and Design of Urban
Water Supply Schemes (DNR, 1997). Analyses have been performed to assess the capacity of the
Existing and Headworks water networks in delivering the desired Noosa Shire (Levels of Service)
LOS to the point of connection of the proposed development. The Noosa Shire design criteria
adopted for this investigation are: -

1. Existing and Headworks Average Day (AD) water demands of 1100 L/ET/day of Noosa Heads
Region Coastal Water Supply Zone.

2. Maximum Hour (MH):AD peaking factor of 3.6 for residential properties and 2.7 for commercial
properties in the Coastal WSZ areas;

3. Under MH demand, residual heads at all nodes within the proposed subdivisions and
surrounding areas are to be equal to or greater than 22m or 16m in small, isolated, highly
elevated land parcels.

4. The reticulation should be capable of providing fire flow of 15 L/s for residential areas
concurrent with MH flow with the residual pressure in the system not falling below 12 m.;

5. Fire Flow services for commercial properties are not to fall below 12m residual pressure;
6. Reservoirs are not to empty during three consecutive Maximum Days (MD); and

7. Pump Stations are to supply MDMM demand in 20 hours/day operation.

3.2 Existing Water Supply System

The proposed development is located in the Peregian WSZ. The Peregian Reservoir (TWL RL 65.0m)
is located adjacent to David Low Way, Noosa. The Viewland Drive Pumping Station, located at the
Viewland Drive reservoir site, provides 20hr Mean Day Maximum Month (MDMM) flow to the
Laguna Reservoir.

The development will be serviced from the Peregian WSZ via an existing 150mm diameter main
within David Low Way.

 

SCANLON PROPERTY GROUP JUNE 2007
ESSENCE OF PEREGIAN, NOOSA — WATER SUPPLY ANALYSIS REVISION 1
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