SCG 31030 Stormwater Management Plan · OPW22/0319

The results in the graphs above display a proposed peak flow rate of 135lt/s and a detained volume of 12.0kL.

Output from the DRAINS analysis of the existing site and the proposed site with detention are as follows: -

                                  Existing Site Q100                = 149lt/s
                                  Proposed site with detention Q100 = 135lt/s

An additional 7kL stormwater re-use water tank is specified to be upstream from the detention tank. This will
further increase the detained volumes for the site.

These drainage features are presented in our stormwater drainage plans 31030 – OW5.1.A / OW5.2.A.


6.3.1     Existing Drainage infrastructure:

The proposed site is to be connected to the existing Council stormwater drainage system in Toolar Street.


6.4.1     Manage Allotment and Cross Allotment Flows:

Upslope flows will be captured by grated field inlets across the rear of the site and piped through the site to the
approved point of discharge.


7.0       FLOODING

The Noosa Shire Council ARI 100Yr Flood Map confirms there is no River / Creek / Waterway or Overland Flow
Flood Planning area for the allotment.


8.0       CONCLUSION:

The measures proposed in this report demonstrate that the development can incorporate Water Sensitive Urban
Design principles into it’s construction and on-going use.

The development will contribute positively to the built environment that will contain it.




Sean Richardson – REPQ 5835
For and on behalf of
SCG CONSULTING ENGINEERS




 SCG Consulting engineers                                   9                               SCG Ref: 31030(SWM)


[OCR of page images]
The results in the graphs above display a proposed peak flow rate of 135lt/s and a detained volume of 12.0kL.
Output from the DRAINS analysis of the existing site and the proposed site with detention are as follows: -

149lt/s
135It/s

Existing Site Qioo
Proposed site with detention Quoo

An additional 7kL stormwater re-use water tank is specified to be upstream from the detention tank. This will
further increase the detained volumes for the site.

These drainage features are presented in our stormwater drainage plans 31030 — OW5.1.A / OW5.2.A.

6.3.1 Existing Drainage infrastructure:

The proposed site is to be connected to the existing Council stormwater drainage system in Toolar Street.

6.4.1 Manage Allotment and Cross Allotment Flows:

Upslope flows will be captured by grated field inlets across the rear of the site and piped through the site to the
approved point of discharge.

7.0 FLOODING

The Noosa Shire Council ARI 100Yr Flood Map confirms there is no River / Creek / Waterway or Overland Flow
Flood Planning area for the allotment.

8.0 CONCLUSION:

The measures proposed in this report demonstrate that the development can incorporate Water Sensitive Urban
Design principles into it’s construction and on-going use.

The development will contribute positively to the built environment that will contain it.

Sean Richardson — REPQ 5835
For and on behalf of
SCG CONSULTING ENGINEERS

SCG Consulting engineers 9 SCG Ref: 31030(SWM)