17 Bottlebrush Avenue, · MCU26/0001

3          Proposed Development Works

3.1        Proposed Site Description
The proposed development will comprise a multi residential dwelling, accessed via a single driveway and
supported by a dedicated on-site stormwater management system.

A key feature of the stormwater management strategy is the inclusion of a detention tank located in the
southwestern portion of the site. This detention tank has been designed to capture and attenuate stormwater
runoff from the developed catchment prior to discharging via the lawful point of discharge into the Council’s
stormwater network to the southwest of the site located within Bottlebrush Avenue ensuring seamless integration
with the downstream network.

In addition to mitigating potential downstream impacts, the proposed system has been designed to achieve
compliance with the Noosa Shire Council Planning Scheme Policy – Stormwater Management, by:

     •    Consolidating site runoff into a single lawful discharge point

     •    Attenuating post-development peak flow rates to pre-development levels or better

This integrated approach delivers a sustainable stormwater solution that not only mitigates the hydrological
impacts of the proposed development but also assists in alleviating existing overland flow from the site into the
properties located to the southwest. The stormwater layout of the proposed development is illustrated in Figure
3-1.




Figure 3-1 Proposed Stormwater Layout




3.2        Time of Concentration Inputs into DRAINS
The time of concentration (Tc) for each catchment has been determined using a combination of:

     1.   Roof inlet time (time for runoff to travel from impervious surfaces to the drainage system)

     2.   Pipe flow time (travel time through the underground drainage system)

Each component is broken down below for the catchment, as shown in the provided screenshot.


 17 BOTTLEBRUSH AVENUE, NOOSA HEADS
                                          7 January 2026                                                P a g e | 11
 Stormwater Management Plan
 Client Reference: P0433-25-001
 Prepared for Made Capital PTY LTD