Floods and stormwater

Floods

How we manage floods

We have a Flood Early Warning System for the Glenorchy City and surrounding area. During extreme flood events, this system will provide us with advanced warning, and allow us to take action to minimise the impact of flooding from Humphreys Rivulet and Barossa Rivulet, which flow through the city centre.

We have an Emergency Management Plan which lists specific actions to be implemented for a flood event.

How you can prepare for floods

To learn more about what you can do before, during and after floods, please visit the Tasmania State Emergency Service website.

Flood studies

Flood studies and mapping help guide Council’s decisions around planning for new developments, identifying potential mitigations options and ways to improve stormwater infrastructure and community safety.

2021 Flood Studies – Glenorchy City Council has released flood maps for the entire urban area following months of research and modelling completed by Council engineers. This will allow Council to improve stormwater infrastructure, guide planning and prepare residents for future flood events. View the study below, find your property on our interactive map or come in to Council Chambers during July 2021 to view our display.

Flooding can affect most areas, but some areas carry a higher flood risk than others. To help you understand the degree of flood risk near your property or future development site, Glenorchy City Council has decided to map flood prone areas in the municipality. The mapping provides an indication of the likely flood prone areas only and should be read in conjunction with the Flood Maps FAQ.

This assessment of flood risk is based on past flooding records, expert opinion, as well as computer modelling about where flooding might occur in the future. We are using as much material as we currently have available, limited by our current knowledge and resources. We didn’t study rural catchment areas. 

We don’t promise that this map is free of errors or complete and we do not accept liability for the accuracy of any of the information in this mapping.  We can also change the map without notice as we get updated information.

If we indicate that an area is not within a flood prone area, that does not mean that your property is free from possibly severe future flooding events. The map is meant to give you only an estimate of the possible flood risk. If you are worried about the future flood risk at your property, you can also seek your own expert advice.

Is my property in a flood prone area? – Check out the Interactive Map

What is a flood study and why is it important?Flood studies – Frequently Asked Questions (PDF)

Map documents and resources

Flood Prone Models – Map Index (PDF)
Flood Prone Models – Area Maps (PDF)

Stormwater

Stormwater generally means rainwater that runs off surfaces such as lawns, roads, roofs, car parks, driveways, patios and natural ground surfaces. Under the Urban Drainage Act 2013, runoff water is defined as water which has been concentrated by means of a drain, surface channel, subsoil drain or formed surface. This means runoff generated from natural surfaces, such as grassed lawns and gardens is not regulated by Tasmanian law.

Our role

We are responsible for maintaining all the public stormwater systems in the municipal area, including public stormwater mains, manholes and pits, and regulating private drainage.

If a property has roof gutters, downpipes, subsoil drains and stormwater drainage that are not connected to our stormwater system, then we may request that it is connected to our stormwater drainage system, if available and practical to do so.

To report an issue with our stormwater infrastructure please get in touch.

Your role

It’s important that residents play a part in keeping our waterways healthy and functioning:

  • You must ensure any stormwater within your property from hard areas, including roofs and driveways, is collected and drained appropriately.
  • You must maintain any private stormwater system on your property, including downpipes, gutters, private stormwater pipes, and gully pits, in a good operational condition.
  • You are not permitted to construct a barrier (dam, levy etc.) that interferes with the natural path of stormwater.
  • You are not permitted to divert or change the natural flow of stormwater.
  • You are required to control stormwater associated with any construction work which takes place on your property.
  • You must keep the natural watercourses and overland flow paths free of debris regardless if there is a drainage easement on your property, and free of obstructions to allow runoff passing through your property in a safe manner and to minimise any potential damage.

Discharging stormwater

Stormwater collected from a property can be discharged by the following points of discharge, subject to our approval. Generally, there is only one discharge point for each lot:

  • to a kerb and gutter discharge point
  • where the lot falls away from the street and there is a stormwater pipe or similar provided with an approved connection point to a public network, then the property must discharge to that drainage network
  • if the above aren’t possible, you can look at disposal onsite (soakage trench) or pressured flow via a pump station. However, these approaches require our approval.

Please note: it is illegal to direct or discharge stormwater onto a neighbouring property.

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