Overflo
Flood Detention
Extended Detention
SSRT
SSRL
Secondary
SRDU
Primary Outlet SRDL
On-Site Detention System Key Parameters
Overflow Weir
Secondary Outlet
SRDU
ters
Ove
r flow
Dedicated Airspace Ou
tlet
Sec
o nda
Dynamic Airspace ry
Ou
tlet
Nett Tank Volume
Total Tank Volume
Top-Up Volume
Rainwater Tank Key Parameters
Ove
r flow
Ou
tlet
Sec
o nda
ry
Ou
tlet
t Tank Volume
al Tank Volume
Project: UPRCT Handbook Demonstration Example
Site Address A Place, South Wentworthville
Job No: W4574-2
Designer: JC
Telephone: (02) 9891 4633
Site Data
OSD Area: Upper Parramatta River Catchment
L.G.A Parramatta City Council
Site Area 0.24 ha 2,400 m2
Total Roof Area 0.06 ha 600 m2
Area of Site draining to OSD Storage 0.216 ha 2,160 m2 Satisfactory
Residual Site Area (Lot Area - Roof Area) 0.180 ha
Area Bypassing Storage 0.024 ha
Area Bypassing / Residual Site Area 13.3% Satisfactory 30% Max
No. of Dwellings on Site 4 Satisfactory
Site Area per Dwelling 0.060 ha
Roof Area per Dwelling 0.015 ha
Basic OSD Parameters
Extended Detention Detention
Basic SSR Vols Ext Detention Storage 300 m3/ha Total Storage 455 m3/ha
Basic SRDs Primary Outlet 40 L/s/ha Secondary Outlet 150 L/s/ha
OSD Tank Bypass
Residual Lot Capture in OSD Tank 87%
Adjusted SRDs 36 L/s/ha 123 L/s/ha
671362298.xls Version 9 HED
On-Site Detention Calculation Sheet for Upper Parramatta River Catchme
Non-HED Secondary Outlet
(Due to Elevated Downstream 100 yr ARI Flood Level)
Project: UPRCT Handbook Demonstration Example
Site Address A Place, South Wentworthville
Job No: W4574-2
Designer: JC
Telephone: (02) 9891 4633
Site Data
OSD Area: Upper Parramatta River Catchment
L.G.A Baulkham Hills Shire Council
Site Area 0.24 ha 2,400 m2
Total Roof Area 0.06 ha 600 m2
Area of Site draining to OSD Storage 0.216 ha 2,160 m2 Satisfactory
Residual Site Area (Lot Area - Roof Area) 0.180 ha
Area Bypassing Storage 0.024 ha
Area Bypassing / Residual Site Area 13.3% Satisfactory
No. of Dwellings on Site 4 Satisfactory
Site Area per Dwelling 0.060 ha
Roof Area per Dwelling 0.015 ha
Basic OSD Parameters
Extended Detention
Basic SSR Vols Ext Detention Storage 300 m3/ha Total Storage
Basic SRDs Primary Outlet 40 L/s/ha Secondary Outlet
OSD Tank Bypass
Residual Lot Capture in OSD Tank 87%
Adjusted SRDs 36 L/s/ha
OSD Calculations
Extended Detention
Basic SSR Volume Ext Detention Storage 72.00 m3 Total Storage
3
Total Rainwater Tank Credits 5.60 m
` Storage Volume Total
3
Storage Volume Ext Detention Storage 66.40 m Flood Detention Storage
OSD Discharges Primary Outlet 8.64 L/s Secondary Outlet
RL of Top Water Level of Storage 10.100 m
RL of Orifice Centre-line 9.100 m
Number of Orifices 1 1 1
Estimated Downstream Flood Level 8.90 1.5 yr ARI
Downstream FL - RL of Orifice Cente-line -0.20 Satisfactory Satisfactory
Design Head to Orifice Centre 1.000 m TWL Detn Storage - RL Orifice
Calculated Orifice Diameter 64 mm Satisfactory Satisfactory
Overflow Weir & Freeboard Calculation
RL of Minimum Habitable Floor Level
RL of Minimum Garage Floor Level
Length of Overflow Weir
Site Runoff Coefficient Baulkham Hills Shire Council
Storm Intensity (5 min 100 yr ARI)
Peak Flow over Weir
Depth of Flow over Weir
Freeboard to Habitable Floor Satisfactory
Freeboard to Garage Floor Satisfactory
Rainwater Tank Calculations (per Dwelling)
Only Complete this Section if a Rainwater Tank Airspace Credit is Claimed
The calculations assume that the same size rainwater tank is installed on each dwelling
% of Roof draining to Rainwater Tank 80.0% Satisfactory
Total Rainwater Tank Volume 5.00 kL Tank Volume OK
Min Volume that triggers Top-up 0.00 kL Note - Min Vol in Tank < 10% Total Ta
Total Tank Vol - Min Top-up Vol 5.00 kL
Dedicated Airspace
Dedicated Airspace 0.00 kL Satisfactory
Extended Detention
Dedicated Airspace Credit 0.00 kL
Maximum Tank PSD 40 L/s/ha
Maximum Tank Discharge 0.0 L/s
Maximum Head to Centre of Tank Orifice 0.000 m No Dedicated Airspace
Calculated Orifice Diameter 0 mm No Dedicated Airspace
Dynamic Airspace
Maximum Dynamic Storage (Nett Vol) 5.00 kL Controls minimum % Roof to Rainwat
Daily Demand on Rainwater Tank 0.657 kL/d Satisfactory
Dynamic Airspace at start of Storm 3.72 kL
Extended Detention
Dynamic Airspace Credit 1.40 kL
Combined Rainwater Tank Credit 1.40 kL
Maximum Rainwater Tank Credit 3.60 kL
Rainwater Tank Credit per Dwelling 1.40 kL
Rainwater Tank Credit for the Site 5.60 m3
Signature: Date:
ta River Catchment
Level)
y 30% Max
y
Detention
520 m3/ha
150 L/s/ha
123 L/s/ha
Detention
124.80 m3
6.16 m3
118.64 m3
52.24 m3
29.60 L/s
10.300 m
10.100 m
1 1
10.05 100 yr ARI
-0.05
0.200 m
178 mm
10.600 m
10.500 m
2.00 m
0.75
206 mm/h
92.7 L/s
93 mm
207 mm
107 mm
)
Credit is Claimed
n each dwelling
Min Max
44.2% 100%
Vol in Tank < 10% Total Tank Vol
y
Detention
0.00 kL
ed Airspace
ed Airspace
inimum % Roof to Rainwater Tank
y
Detention
1.54 kL
1.54 kL
5.00 kL
1.54 kL
6.16 m3
