OPW info response · OPW15/0142

4      Update design plans including pipe invert levels to provide a minimum 400mm filter
depth.

Response to item 4

See amended plans 1303-21C


Information Required
5      Provide plans that show finished surface levels that demonstrate that all areas of the
catchment drain to the proposed water quality treatment structures pursuant to documents
approved in MCU13/0030.

Response to item 5

See amended plan 1303-19C showing the correct levels of the swale and refer to plans 1303-
12C, 18C and 19C for ground levels.


Information Required
6      Update bioretention swale and bioretention basin underdrainage details on 1303-21 to
demonstrate that there is adequate fall within the depth allocated for the drainage layer, the
underdrainage system of the swale will function without causing ponding, and consistency with
Section 3.5.1.4 of Water by Design Bioretention Technical Design guidelines Version 1.1
October 2014.

Response to item 6

The depth & width of weir and shute as well as flood immunity and capacity have been added to
1303-21C & 19C.



Information Required
7      Demonstrate how the width of the proposed overflow weir shown on Drawing 1303-21 is
consistent with Condition 27(b)(ii) of MCU13/0030 and Section 3.5.4 of Water by Design
Bioretention Technical Design Guidelines Version 1.1 October 2014.


Response to item 7

The depth and width of the chute as well as flood immunity have been added to plan 1303-21C.


Information Required
8      Provide design information for rainwater tanks on the plans to demonstrate that Condition
31 of MCU13/0030 is achievable on site.

Response to item eight

See attached drawings 15024-1 to 15024-11 by Ian Bradford Plumbing Consultants Pty Ltd.
These drawings show two 24,000-litre tanks, one used for toilet flushing and the other used for
landscape purposes.




X:\JOBS\CT Projects in progress\1303 SWQ plan for age care\Correspondence\OPW\OPW15.0142_InformationResponse_Letter.doc