Request to Amend Application and Response to Council's Information Request · MCU14/0009

Stormwater Plan

Issue
The submitted report does not provide any detail on the existing and proposed stormwater
drainage system. It is suggested in the submitted report that any increase in runoff from
the development will be addressed by the inclusion of tanks detailed in the subsequent
Operational Works application. As the location (underground or above ground) and size of
any tanks could impact on the layout and be affected by flooding it is necessary for a
preliminary stormwater drainage design to be submitted.

Information Required
4. Provide a preliminary stormwater drainage plan that indicates the existing stormwater
     drainage system and the proposed new stormwater drainage system. The plan must
     be:

   (a) Prepared by an RPEQ.
   (b) Include the location and size of any proposed tanks.
   (c) Include any existing or proposed water quality treatment devices.
   (d) Outlets points to the Council drainage system.

In response to Item 4 of Council’s Information Request, Tod Consulting’s subconsultant
Aqualntel has prepared a Stormwater Management Plan for the site, which is included
within Appendix C of this response. The Stormwater Management Plan prepared by
Aqualntel has been used by Tod Consulting to prepare a preliminary stormwater drainage
design to address Item 4 of Council’s Information Request. As summarised by Tod
Consulting’s Technical Notes included within Appendix B of this response, the proposed
system consists of:

      27m2 bio-basin provided along the eastern boundary to treat and improve
       stormwater quality prior to discharge to existing piped stormwater system;
      Proposed 300mm diameter piped connection to proposed pit constructed over
       existing 300mm diameter pipe, adjacent to the south eastern corner of the site;
      Bio-basin has been increased in depth to provide onsite stormwater detention,
       avoiding the need for above ground or buried water detention tanks (please note
       this separate any rainwater tanks for water re-use that may be proposed by
       others);
      Kerb and grated trench drain provided along southern boundary – this will capture
       and convey the majority of stormwater run-off from the paved areas to the bio-
       basin;
      Existing and proposed roof water to be directed to bio-basin from treatment.

Frontage Works

Issue
The submitted report suggests that no external works are required. The site does not
have kerb and channel or a footpath across the full frontage. Pedestrians walking from the
Factory Street to the Hill Street footpath currently travel through the access driveway
which is within private property.

Information Required
5. Provide revised plans that indicate the necessary frontage works as described in
     Specific Outcome O13 of the Transport, Roads and Drainage Code or alternatively
     provide justification why these works are not provided.