Water, Sewerage and Stormwater

1. Information for Property Owners

Property owners wanting information about water, sewerage and storm water need to know what plumbing zone they are in because associated services and facilities are part-managed by TasWater.

Contact TasWater if:

  • water and sewer issues are outside a property boundary;
  • stormwater issues that are outside the boundary of a property in a combined plumbing zone.

 

Contact our Infrastructure Department if:

  • you believe your property is in a combined plumbing zone;
  • stormwater issues that are outside the boundary of a property in an area other than the combined plumbing zone.

 

Stormwater Connections

Understand what you need to know about stormwater by reading this brochure(PDF, 4MB). Get to know the urban stormwater drainage system by visiting our mapping platform

To apply for a stormwater connection, click here

 

2. Stormwater

What is stormwater?

Stormwater is a term used to describe rainwater runoff in urban areas. Stormwater generally starts as rain falling on hard stand areas such as roofs, driveways, roads, car parks and road pavements. Some rain water soaks into the ground, evaporates or is captured by rainwater tanks but most of it ends up in stormwater drains which flow directly into our natural waterways. Launceston's stormwater network contains over 438 kms of pipes, 6479 manholes, various sewer and stormwater pump stations, as well as urban waterways such Kings Meadows Rivulet.

Stormwater Image1.png

 

Why can stormwater be a problem?  

Stormwater becomes a problem when it causes flooding and erosion, or when it collects debris, chemicals, dirt and other pollutants as it flows.

Stormwater flooding can also be called overland flow. Overland flow can be generalised as water that is flowing down to a water course, such as a creek or river. Usually the network of pits and pipes collects this water at low points in the streets and transports it underground to the natural waterways. However, at times the pipe network may be not be able to take all of the water, resulting in overland flow through properties. This can occur quickly resulting in flash flooding.  

Stormwater pollutants can be harmful to aquatic organisms and ourselves, and can generally impact on the health and natural beauty of our waterways. Pollutants such as oil, grease, fuels, fertilisers, herbicides, pesticides, detergents, chemicals, litter and heavy metals which aren’t naturally found in our waterways can be toxic and dangerous even in small amounts. Other pollutants like soils, nutrients from organic wastes (lawn clippings, leaves) and bacteria (animal droppings) are naturally found in waterways, but are now present in such large amounts that they too can be harmful.

What can you do about stormwater?

  • Know your stormwater / overland flow flood risk - review Council's flood mapping to understand how your property may be affected by stormwater flooding.
  • Plan - develop an appropriate flood plan based on your flood risk.
  • Flood proof your property -
    • Store items off the floor under houses, sheds and in garages etc;
    • Consider property modifications using flood resilient construction methods to reduce impacts.
  • If it's flooded… forget it - do not enter floodwaters, even in your vehicle as you could be swept away. Only a small amount of water is necessary for a vehicle to be swept away. Floodwaters are also full of pollutants and a health concern.
  • Reduce your impact on the stormwater system -better manage your stormwater at home, visit the NRM North website for tips.
    • Improve the quality of stormwater at home;
    • Reduce the quantity of stormwater runoff at home.
  • Ensure your property is compliant - stormwater pipes, gutters, pits and any other components of the stormwater systems on private property must be in good condition and comply with requirements.
  • Report Issues - if you see a problem that requires attention, report it

 

What is Council doing about stormwater?

  • Flood modelling and mapping - significant investment in flood modelling of our urban stormwater network and waterways;
  • Risk assessment and stormwater system management plans - currently developing risk assessments of our urban stormwater network to inform the development of stormwater system management plans;
  • Scheduled and reactive maintenance - street cleansing, pipe and pit inspections etc;
  • Development control and land use planning - detention basins, water quality impacts, developing recommendations to introduce urban (stormwater) flooding controls through the planning scheme;
  • Targeted capital projects - development of capital projects, considering flooding impacts at a neighbourhood level, prioritised according to severity;
  • Waterway management and maintenance - on-going management of Council's drainage reserves; and
  • Water quality monitoring - to understand the impact of urban runoff on sections of waterway.

 

3.  Urban (Stormwater) Flooding 

 The City of Launceston has used computer modelling to develop an urban (stormwater) flooding map. The map shows the 1% AEP flood event, flooding that has a 1% chance of happening each year. The map is available here.

Display options include:

  • the flood extent (the area that is modelled to be wet);
  • the flood depth within this area;
  • the flood hazard (combination of depth and velocity) within the area.

Flood hazard relates depth and velocity gives an indication of the potential impact of the flood waters. It can be used to inform emergency and flood risk management, as well as strategic and development planning.

It is recommended that you review the mapping to understand how your property may be affected by stormwater flooding and develop an appropriate flood plan based on your flood risk. Urban (Stormwater) flooding may occur quickly, and as such preparedness is the best mitigation method. It is important to avoid stormwater flooding where possible. View more about stormwater safety here. 

Please note: the maps are produced from computer models. The models are based on the best data available to Council at the time the models were developed. The maps are indicative only of possible flood extents, if the data and assumptions on which they are based are reproduced in a future weather event.

 

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Image: Flood Hazard Categories

 

4. Flood Emergency Management - Stormwater Safety

Stormwater Safety

Everyone must take particular care when they are in the vicinity of the stormwater system as storm water drains, manholes, pits and grates pose a danger in both wet and dry weather.  

The stormwater system criss-crosses the city taking rainwater away from our streets and homes, sending it to the ocean. The system is more than 438 kilometres long, which is approximately the distance from Launceston to Hobart and back.   

Some sections of the stormwater drains are only a few metres long but others run for kilometres. They consist of pipes that narrow down, and expand back out.  They have debris traps and deep pits with no ladders - and no means of escape. 

When it is not raining they are homes to rats, snakes and spiders. When it rains, the pipes flow to full capacity, sucking in anything they can from bicycles to wheelie bins.  The stormwater system is dangerous in the dry and can be deadly in the wet. 

Manholes
Manholes indicate a change in direction for pipes.  Manhole covers weigh between 20 and 30 kilograms (the same weight as a large full suitcase).  When really full, manhole covers can sometimes be lifted and thrown by the pressure of water below. That means a person wading through floodwater risks falling into an open manhole full of water. Then, when the water begins to subside, it can rush in like a whirlpool, sucking you in.  

Grates
A grate is constructed of steel weighing between 80 and 110 kilograms (the same weight as a small motorbike). Do not lift stormwater grates or lids under any circumstances as these could cause serious injuries.

Stormwater pits
Stormwater systems have pits and debris traps which range from 1.2 to 3.6 metres long. The pits have no ladders and therefore no way to get out. 

Fast moving stormwater
Flowing stormwater and hidden debris can easily knock a person over and sweep them away, possibly into storm water drains.  It also has the potential to sweep cars of flooded causeways and roads.  Never drive through flood water.  Turn around and find a safer route.