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Site Based Stormwater Management Plan
Original PDF page 13, section 1. The text section number identifies this passage in the reader.
Plans and drawings
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Log in to see the plans as drawn4.6 Stormwater Detention Characteristics
XPSTORM modelling software was used to develop the detention tank outcome to ensure
post-developed stormwater flow rates were consistent with the pre-development flow rates
in accordance with the Noosa Plan (2020). Table 4.5 and Table 4.6 below summarise the
proposed underground detention tank characteristics.
Detention Maximum
Detention Type Water Outlets Weirs
Volume
Elevation
100 mm dia. pipes Stormwater [email protected] Inlet from
Bioretention
Underground 100 mm dia. pipes
94.5 m3 *RL16.m
Detention [email protected] 0.71m weir
orifice in top of
100 mm dia. pipes 225mm upstand
@ invert of tank [email protected]
IL113.7
Table 4.5 On-Site Detention Characteristics. *During the 1%AEP
In XPSTORM the stepwise linear storage method was used, where the area at varying
depths demonstrates the volume provided for detention.
Structure Depth (m) Stepwise Surface Area (m2)
Underground 0 63
Detention Tank 1.5 63
Table 4.6 Detention Tank Characteristics
The results of the detention tank model are presented in Section 4.7 below.
Site Based Stormwater Management Plan Page 8 of 19
2123-SBSMP-01_Version 1.0 (October 2021)
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