Civil Package

Based on the modelling, the minor increase to impervious area from the proposed development will only result in
an increase of 1L/s for the 1% storm AEP event, being a change of only 2% The pre-post comparison found that
under all other storm events up to the 1% AEP analysed not resulting in an increase of the peak flows. As such, the
proposed development is considered to not impact the downstream receiving environment in a manner that will
alter the catchment hydrology or result in nuisance run-off that may impact downstream properties.

As peak outflows from the development are typically as per existing conditions, no stormwater attenuation is
required to control outflows from the proposed development.




Project number 20220051                                                                                       Page 12 of 16
File RECOR Stormwater Management Report - 20220051.docx, 2022-05-05 Revision 0

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