RFI - P0478-26-001_45_Maple_Street_Cooroy_SWMP

2           Introduction
2.1         Background and Scope

RECOR has been engaged by Myall Rise Pty Ltd to prepare a Stormwater Management Plan (SWMP) for a proposed
Material Change of Use (MCU) involving the retention of the existing dwelling at 45 Maple Street and the
development of the vacant lot at 9 Myall Street to facilitate a multiple dwelling development.

This report has been prepared to support the Development Approval Application submission to Nosa Shire Council
and any nominated referral agencies. The proposed development’s property details have been summarised in
Table 2-1.

The SWMP addresses potential stormwater impacts resulting from the proposed development and outlines the
necessary mitigation measures to meet both quantity and quality requirements of Noosa Shire Council.

This report presents the hydrological assessment of the proposed development, including any external catchments
that may directly influence peak flows exiting the site. The purpose of the assessment is to ensure that post-
development stormwater discharge does not adversely impact existing flooding or stormwater conveyance
conditions on surrounding properties and that the stormwater management objectives of the QUDM and Noosa
Shire Council requirements are achieved.

Additionally, the assessment evaluates the development requirements for stormwater treatment to ensure
compliance with Water by Design guidelines, the SPP, and council water quality requirements.



Table 2-1 Property Details

 Site Details                         Parameters

 Site Location                        45 Maple Street & 9 Myall Street, Cooroy QLD 4563

 Lot Number                           15 on C5605, 1 on RP99323, 2 on RP99323, & 18 on C5605

 Intended Land Use                    Material Change of Use for Multiple Dwellings

 Development Area                     3,119 m2




2.2         Stormwater Management Objectives and Design Approach

The intent of this report is to document the design considerations and outcomes that satisfy the stormwater
management objectives for the proposed development. The strategy has been developed to address the following
key aspects and performance objectives:

      •   Catchment Definition: Identification of all catchments and sub-catchments discharging through or into the
          site.

      •   Hydrological Assessment: Determination of existing flow conditions for multiple storm events and
          assessment of development impacts on surrounding properties.

      •   Flow Management: Ensuring post-development peak flows do not exceed pre-development flows across
          all relevant storm events, up to and including the 1% AEP.

      •   Lawful Point of Discharge: Identification and utilisation of a lawful point of discharge in accordance with
          QUDM, ensuring no actionable nuisance to downstream properties or infrastructure.




 45 MAPLE STREET, COOROY
                                         24 June 2026                                                P a g e |4
 Stormwater Management Plan
 Client Reference: P0478-26-001
 Prepared for Myall Rise PTY LTD