SBSMR 20004 Revision D - Response to RFI

4.3 CONCEPT STORMWATER MANAGEMENT LAYOUT

Runoff from the buildings is collected via a piped drainage system. This piped system will be
connected into the new stormwater infrastructure. A detention tank will be installed to reduce
peak runoff to below pre-construction runoff.


The lawful point of discharge for the site has been undertaken as follows:

Areas of the landscaping which are well below the ability of the stormwater infrastructure to
collect will be allowed to flow as overland flow to the rear south-western corner of the
property into a soakage pit. We have estimated that the area of landscaped site discharging to
this location will be 450m2. An existing grated inlet exists at the lower corner of 28 Viewland
Drive to pick up this flow.

Most of the pre-development flow would have discharged to this point. We are, therefore,
substantially reducing discharge to this location.

The areas of the site which can be picked up by the development’s stormwater infrastructure
will be discharged by a new piped stormwater network running down viewland drive and
connected into the existing stormwater gully at the corner of Viewland Drive and The
Quarterdeck. The area discharging to this gully will be 2655m2. Runoff will be limited to below
pre-development flows by the installation of a detention tank with orifice plate.

Neil McKenzie & Associates Drawings No. 20-004-
C01 Issue 4 Stormwater Layout
C01.1 Issue 5 Stormwater Long Sections
C01.2 Issue 2 Stormwater Catchment Plan
C02 Issue 2 Stormwater Long Sections




NMA-SBSWMR-20004 Noosa Youngcare                                                                  6