RFI - stormwater report

Executive Summary
AquaIntel Pty Ltd was commissioned by Tod Consulting Pty Ltd to prepare a Stormwater
Management Plan to support the Reconfiguration of Lot Approval for proposed residential use
(10 Lots) at 30 Pottery Street, Pomona (Lot 496 MCH 591).

The site is currently undeveloped and is consistent with a rural residential area with the
existing lot having a dwelling, shed and most of the site is vegetated with trees. The site is
formed by a ridge to the north and falls south to the adjoining properties and Pottery Street to
the east.

Environmental best management practices are proposed for treatment of stormwater flowing
from the site. Stormwater will pass through a treatment device prior to discharge to the
receiving environment. The stormwater treatment strategy for the site will include collection
of runoff from roofed, roads and allotted areas being treated via a single bioretention basin
located at the south-east corner of the site.

It is proposed that the outlet from the site will be diverted (piped) to the natural waterway
approximately 100m south of the developed site. The piped outlet will divert the change in
peak flow from the proposed site in order to prevent nuisance runoff from affecting
downstream private properties and the road reserve.

No nuisance flooding has been has been demonstrated, as differences in peak flow times in
the regional sub-catchments do not coincide to create a significant change in peak flow
associated with the change in impervious characteristics from the developed site.