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What is a Stormwater Management Plan?

A Stormwater Management Plan (SMP) is a strategic planning document which aims to address existing stormwater problems within a catchment, or catchments, and identify opportunities for providing a range of benefits through a multi-objective planning process. This multi-objective planning includes consideration of flood risk, protection of water quality and opportunities for stormwater reuse.
In the context of the City of Whyalla, the catchment is defined by a study area as shown in Figure 1 below.

SMP Study Area(675 kb)

Why is an SMP being prepared?

There have been numerous occurrences of flooding within Whyalla, including those in November 2015 and September 2016. Whilst heavy downpours have historically resulted in nuisance flooding within the city, there had been no detailed assessment of the flooding risk posed by varying rainfall events to clearly document the extent and severity of problem areas.

In response to this, Council, with financial support from the State and Federal Governments, has commissioned Tonkin Consulting to develop a Stormwater Management Plan for the City of Whyalla.

The document provides a clear understanding of the current issues and will enable Council to develop a consistent, sustainable, environmentally aware and integrated approach to stormwater management which will provide a framework to address priority drainage issues, integrate future development, land use and infrastructure planning across the city.

Whilst largely driven by the need to address stormwater flooding within the city, Council are also keen to explore opportunities for integrated water management, including addressing the quality of water discharging to Spencer Gulf and potential reuse to augment Council’s existing non-potable irrigation scheme.

The SMP aims to:

-          Clearly set out the objectives for managing stormwater in the city

-          Identify actions (both structural and non-structural) to manage stormwater to achieve beneficial outcomes and meet the specified objectives

-          Provide a justification for any proposed catchment studies, works, measures or actions

-          Provide an initial estimate of capital and recurrent costs and assign priorities and timeframes to each of the actions

-          Define the obligations of the relevant parties in funding, implementing and communicating the plan.

  The SMP is being jointly funded from:

-          Stormwater Management Authority (SMA)

-          Natural Disaster Resilience Program (NDRP) - SAFECOM

-          Whyalla City Council

Documentation

A summary brochure for the draft Whyalla Stormwater Management Plan is presented in the document below.

SMP - Summary Brochure(2562 kb)

A summary of the draft Whyalla Stormwater Management Plan is presented in the Consultation Summary Report below.
SMP - Consultation Summary Report(14147 kb)

A summary of the main flood mitigation measures and their priorities and estimated costs identified by the draft Stormwater Management Plan are shown in the figure below.

SMP - Figure 5.1(1916 kb)

The draft Whyalla Stormwater Management Plan and appendices are available below.

DRAFT Whyalla SMP(92333 kb)
Appendix A – Flood inundation and hazard maps 1-8(25902 kb)
Appendix A – Flood inundation and hazard maps 9-16(24320 kb)
Appendix A – Flood inundation and hazard maps 17-24(24573 kb)
Appendix A – Flood inundation and hazard maps 25-32(26192 kb)
Appendix A – Flood inundation and hazard maps 33-40(24857 kb)
Appendix B – Hydraulic Modelling Report(15042 kb)

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