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Stormwater management plan

Traditionally stormwater has been managed as a nuisance and a hazard to be removed as quickly and cheaply as possible. The wisdom of a single focus consideration of stormwater is increasingly being questioned as community awareness grows about some of the adverse impacts of stormwater.

Council endorsed two Stormwater Management Plans (SMP) in 2013. Both of these have been developed to holistically manage the city’s stormwater runoff within their respective areas.

The plans identify the following:

  • Flood risks and associated mitigation measures.
  • Works and measures necessary for improving water quality.
  • Opportunities for Ecological and biodiversity improvements.
  • Investigations of further potential to harvest and re-use stormwater.

Many suburbs in Adelaide have a long history of flooding because the land is flat and close to sea level, and much of the stormwater infrastructure is ageing. Here in Marion we are lucky and the risk of flooding is not great.

The flood-plain maps thus far produced for two of the major areas in our city were created using computer modeling techniques. This modeling indicates where stormwater will flow in large storms up to a one-in-100 year rainfall event in key water catchment areas.

The initial analysis has found that a large proportion of the stormwater infrastructure is either in relatively good condition or is adequate. The detailed planning has enabled us to set aside significant funding to replace or upgrade our stormwater systems over the next 20 years.

Reducing stormwater pollution

There are a number of steps that residents can take to help reduce stormwater pollution, including washing cars responsibly, taking care when using fertilisers in the garden, disposing of litter responsibly, and not letting building materials blow away or be washed down the drain.

Floodplain maps

Disclaimer: This map was developed in 2013 for the City of Marion and City of Holdfast Bay joint Stormwater Management Plan. The data contained on this map is based on survey, hydraulic and hydrological modelling at accuracies sufficient for broad scale flood risk management and planning only. The flood extents depicted in this map are not based upon historical floods.  Further, this map is premised on a series of assumptions concerning the catchment area and does not take into account factors which may cause or otherwise impact upon localised flooding.  Accordingly, any person who seeks to rely upon this must do so with the knowledge and understanding that this map cannot predict the impact of development, earthworks and other activities undertaken in the catchment in the future and their resultant impact upon flooding.

As such, this map does not and cannot be used to accurately predict localised flooding risk or flooding extents within the catchment.  If you need to assess a particular property or properties for flooding risk, you must seek specific, independent advice in this regard.  This map is made publicly available for the purposes of the City of Marion and City of Holdfast Bay joint Stormwater Management Plan only.  Those responsible for the preparation and publication of this map do not accept any responsibility for any loss or damage alleged to be suffered by any person as a result of the publication of the map and its notations, or as a result of the use or misuse of this information.

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