23616 DA - Change a Development Approval [As Published] · 132003.221132.4

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§2.43. Stormwater Management - MUSIC modelling; Prior to the completion of the final
stormwater management plan and the civil design drawings for operational works,
any stormwater management assessments utilising the CRC for catchment
hydrology's MUSIC modelling system must be corrected for a possible error in the
assessment of bio-retention system efficiencies and performance in removal of
Nutrients, as recently notified by the CRC. Empirical calculations such as the
Brisbane City Council spreadsheet method shall be use to adjust the MUSIC model
and to demonstrate that realistic removal efficiencies are being used. Alternatively,
once a 'patch' is available from the CRC, this corrected version of the software can be
used, but, again, cross checking with empirical calculations is required. The error in
the bioretention routine will result in the need for additional water quality treatment
measures. Initia! assessments indicate that MUSIC is over predicting removal by as
much as twice what should be occurring.’

If these checks indicate that the bioretention devices require entarging, the applicant
shail remove lots, if necessary, from the development in order to accommodate the
devices without affecting the public and private open space areas. If the system
requires amending, an amended report is to be submitted to Council for checking.

53.44, Monthly reports on monitoring, incidents, corrective action and plan updates are*~ ~~ Nemeetat Bullets and

required to be submitted to Council. These reports are to be submitted in a form
acceptable to Council and are to highlight any non-standard results.

84-45. Any stormwater outlet to the gullies on the site are to be stabilised with appropriate
energy dissipation and local armouring. Regular monitoring of creek erosion is
required with appropriate corrective action specified to ensure a stable creek system.
All work to be undertaken to minimise impacts on the Environmental Values of the
creek system.

55-46. The residential precincts shall be designed to incorporate, within their boundaries,
all the necessary stormwater and water quality control devices associated with the
development.

56.47, The applicant will ensure that all necessary overland flowpaths for Q100 events are
provided on site and covered by an easement where they traverse private property.

Water Quality

5248. The Developer is to install water quality control devices generally in accordance withs - - -
the Stormwater Management Plan. Detailed staging plans and specifications, based Numbering
on and generally in accordance with the Plan are to be prepared and submitted (after

consultation with officers of the Council) with the relevant applications for operational
works.

 

Drainage

58.49. The Developer is to complete the drainage works progressively in conjunction withe - - -
development of the site and generally in accordance with the approved Stormwater Numbering
Management Plan. Detailed drainage plans and specifications, based on and
generally in accordance with the approved Drainage Pian, the EMP and these

Conditions, are to be prepared and submitted (after consultation with officers of the
Council) with the relevant applications for operational works.

59-50. All drainage works as required by the Drainage Plan are to be provided by the
developer at its own cost.