20517 App J.pdf [As Published] · 132007.1259

Concept Stormwater Management Plan
Essence of Peregian

Table 4.5: General Properties of Bio-filtration Basin and Wetland treatment nodes

 

 

 

 

 

 

 

 

 

 

Property Treatment Node
Bio-Filtration Basins Wetlands
Filtration Depth (m) 0.6 :
Ponding Depth (m) 0.2 or 0.3 0.2
Filter Media Sand -
Filter Median Particle 07 .
Diameter (mm) ‘
Saturated Hydraulic
Conductivity (mm/hr) 360 180
Seepage Loss
(mm/h) 0 36
Permanent Pool . 0
Volume

 

 

 

 

 

Default k and C* values have been adopted for each Basin node.

The general properties of the rainwater tanks as modelled in the mitigated scenarios are presented in Table 4.6.
Further detail of rainwater tanks is presented in Appendix C.

Table 4.6: Rainwater Tank treatment node properties

 

 

 

 

 

 

 

 

 

Property Value Reuse Connections
Tank Capacity per Beach Shack 3kL Toilets and Laundry
Tank Capacity for Buildings A1 B1 12 kL Irrigation
Tank Capacity for Buildings A2 B2 QkL ___ Irrigation
Tank Capacity for Buildings C1 B3 11 kL Irrigation
Overflow Pipe Diameter 150 mm :

 

 

Rainwater tank sizes for the beach shacks were set by the Project Team Architect. Rainwater tank sizes for the
other buildings were calculated by applying an irrigation rate of 25 mm/m’/week over the area to be irrigated and a
total of four days effective storage. The daily irrigation demand is the multiple of the irrigation rate and the irrigation
area divided by seven days per week. The irrigation areas and daily irrigation demands are presented in Table 4.7
below.

Table 4.7; Accommodation Building Irrigation Areas and Demands

 

 

 

 

 

 

 

 

 

Accommodation Irrigation Rate | Irrigation Area | Daily Irrigation Demand (kLiday)
Building (m*/m?2/week) (m?) ,
Buildings A1 & Bi 0.025 835 2.98
Buildings A2 & B2 0.025 615 2.20
Buildings C1 & B3 0.025 745 2.66

 

Internal reuse rates by toilets and laundries of the beach shacks had to be calculated for MUSIC rainwater tank
nodes. For the 3-bedroom beach shacks an Equivalent Population (EP) base value of 2.5 was chosen per beach
shack. A daily consumption rate per EP of 240 L/EP/day was adopted. Due to the seasonal variability of use of
coastal holiday accommodation, seasonal occupation rates for appropriate accommodation types were researched
(Office of Economic and Statistical Research, 2006). Seasonal occupancy rates for holiday units from 2005 and
2006 were averaged and applied to the proposed beach shacks. Refer to Section 5.3.3 for these adopted seasonal

occupancy rates.

 

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