RFI - Attachment 1 - Amended Stormwater Management Plan

1. INTRODUCTION
Auxilium Consulting Pty Ltd (Auxilium) has been engaged to prepare a Stormwater Management
Report to accompany a development application for a residential subdivision located at 25 Tulip
Street, Cooroy. This report investigates the stormwater management considerations for the existing
and proposed development site and assesses how the run-off from the site is to be managed in
accordance with Noosa Council (Council) requirements for stormwater drainage.

Council issued an Information Request (IR) on 7 April 2026 focussing on clarification of stormwater
aspects which this report has been updated to address.


2. SITE DETAILS
2.1. Existing Site Description and Drainage Regime
The existing Site is located at 25 Tulip Street, described as Lot 58 on Plan RP32777, and contains an
existing dwelling and shed with an area of 1,529 m2. The Site is a residential setting with a large
proportion of permeable areas.




FIGURE 1 SITE LOCALITY PLAN (NOOSA COUNCIL INTRAMAPS, 2025)

The Site slopes away from the road frontage towards the rear of the property. An unmapped channel
conveys flows to the east and eventually into the Lake Macdonald catchment system. This existing,
open channel discharges in a concentrated state from the Site.

Roof run-off from the existing dwelling is discharged to the rear of the Site as overland flows to the
existing channel. Road surface flows are excluded from the Site’s catchment with the kerb and
channel and crossover.