Appendix G Water and Sewer Analysis

                       WATER SUPPLY AND SEWER NETWORK ANALYSIS
Client: Noosa Shire Council                        Location: 62 Lake Macdonald Drive, Cooroy



2.0 WATER NETWORK ANALYSIS
There is one connection point proposed for the development off the existing DN250 DICL main on
Dianella Ct. A new DN150 PVC-O water mains is proposed generally alongside the proposed road
within the development. Refer to the Site plans in Appendix A for the development layout.


2.1 Demand

For this assessment, the equivalent persons (EP) was determined based on 100 units within the
development. The development proposes 90 x one and two-bedroom units and 10 x three-
bedroom units distributed equally over the three lots. It is assumed that these units will have a
maximum of two storeys.

The assumptions used to calculate the total EP were as follows (based on Unitywater’s Net Serv
Plan (2019):
   • 2.64 EP per detached dwelling or three-bedroom unit
   • 1.77 EP per one to two-bedroom unit

Based on these assumptions, the total demand for the development was 186 EP.

The following values were adopted from the South East Queensland Water Supply and Sewerage
Design and Construction Code (SEQ WS&S D&C Code, 2020) to calculate the water demand:

•   Average day,             AD = 230 L/EP/day
•   Non-revenue water,       NRW = 30 L/ EP/day
•   Peak day,                PD = 2 x AD
•   Peak hour,               PH = 4 x AD

The water demand estimated for the proposed development was based on the estimated EP as
shown in Table 1.
                              Table 1 – Development Water Demand
                                                Water Demand
                          Design
                                        L/EP/day               L/s
                         Parameter
                            AD            230                 0.49

                           NRW             30                 0.06

                            PD            490                 1.05

                            PH            950                 2.04

The calculated demand for the proposed development was distributed among the proposed nodes
in the InfoWater model. The diurnal water supply demand patterns used for each water demand
node in the InfoWater model was medium density residential (MDR) which was provided together
with the model supplied by Unitywater.




Covey Associates Pty Ltd                   2                                   Project No: 233467
Consulting Engineers                                                           M23-0030Rpt Iss A