Stormwater

Council’s Role in Managing Stormwater

Council is responsible for the care and maintenance of the public stormwater drainage network within the Sorell Municipality. This includes public stormwater mains, manholes, pits and Council maintained roadside table drains.  Council also maintains the stormwater mains owned by Council but situated on private property.

As part of meeting its obligations, Council:

• undertakes assessments of the urban area of the Council’s municipal area;
• documents the stormwater assets under its control;
• conducts frequency-based inspections of its stormwater assets  with allocation of resources reflective of various risk factors; and
• completes required work on stormwater assets identified during the inspections.

One of the objectives of the Urban Drainage Act 2013 is to ensure stormwater services, infrastructure and planning are provided to minimise the risk of urban flooding due to stormwater flows.  To help meet the objective of providing stormwater systems as may be necessary to effectively drain the urban area of the Council’s municipal area, Council engaged a consultant to carry out a 1 in 100 year storm event catchment analysis.  This models overland flows and stormwater infrastructure capacity performance of Sorell’s urban areas during a significant storm event.

One of the outcomes of the catchment analysis was a set of recommended options.  Council is considering the practicality and financial sustainability of those recommended options.

A Map of Council’s Stormwater Infrastructure can be found here.

Natural Overland Flow

Property owners should also ensure that water in a concentrated form is directed to Council’s stormwater drainage system or another legal point of discharge, such as the street or on-site stormwater absorption trench.

Property owners should always seek professional advice before starting work that may change the drainage and water flow of their property.

Concentrated Overland Flow

Water that flows from hard stand areas e.g. driveways, paths, paved areas, landscaped areas, roofs, drains from roofs, open drains and cut-off drains.  A property owner must ensure that stormwater is not discharged from a private stormwater system so that it causes a nuisance to a neighbouring property or its residents.

Seepage (Ground) Water

Water that does not drain into a formed channel or stormwater system.  Seepage may be caused be a number of factors, including

• surface run-off from a neighbouring property;
• faulty internal plumbing;
• faults within Council’s stormwater mains or TasWater’s sewer or water mains;
• natural groundwater.

Individual property owners should ensure they control and minimise the risk of seepage to their properties by taking steps such as the installation of subsoil drains.

Where sloping blocks have been excavated to obtain a flat yard or building site, subsoil drains should be constructed to redirect water to a stormwater drainage system. Property owners should seek the advice of suitably qualified and/or experienced professionals in the design and installation of such drains.

Property owners are responsible for management of stormwater drainage and surface water within their property.  This can be achieved by maintaining roof gutters, downpipes, rainwater tanks, surface channels and other components to minimise the possibility of stormwater entering theirs or their neighbour’s property.

Property owners must accept natural overland flow from adjoining properties or public land and must not divert or redirect the flow from its natural path onto neighbouring properties.

A downstream property owner should not erect any type of barrier that interferes with the path of stormwater unless provision is made for the flow to discharge to an approved drainage system.

When constructing hardstand areas such as driveways, concrete and paved areas, or landscaping that have associated drainage, property owners must control the stormwater in order to prevent concentrated water impacting onto adjacent properties.

Property owners generally need to ensure that roof water and hardstand areas are drained to a lawful point of discharge such as:

– Kerb and channel;

– Roadside table drain;

– An inter-allotment stormwater drainage pipe system; and

– Subject to Council approval, a Council controlled drainage easement or drainage reserve.

Council is responsible for regulating private drainage.  Council may direct a property owner to connect to Council’s stormwater drainage system or other legal point of discharge.

Property owners need to be aware that fences and landscaping can change the topography of a property and the way it disperses water.

It is the property owner’s responsibility to maintain private stormwater infrastructure. If there is a stormwater issue caused by the failure of your own internal plumbing, contact your plumber.

Council receives a number of complaints each year regarding stormwater runoff and overland flow from private property causing an issue to an adjoining or downstream private property. In such instances Council’s intervention powers are very limited and it is likely to be a private civil matter between the adjoining property owners.  Stormwater issues regarding runoff and overland flow between private properties should be resolved between those property owners.

You can report any Council related stormwater issue to us on 03 6269 0000. This number can also be used to report urgent after hour’s stormwater issues.

Where private property appears to have been impacted by stormwater from Council’s drainage network, Council will assess the site and determine any further action (if any) to be taken by the Council and the works required to rectify the issue.

Neighbouring properties impacted by sub-surface drainage

If an owner excavates into the land and groundwater seeps out of the cut, it is the owner’s responsibility to manage this water. Similarly, if the land has a ‘spring’ or high water table.

Private Nuisances – Disputes between neighbouring properties

Council or other government agencies do not have the power to deal with all drainage issues, land owners should seek their own legal advice to determine how these matters can be resolved.

Please refer to Flooding Information – Sorell Council

The Southern Beaches (Lewisham, Dodges Ferry, Carlton, Carlton River) lacks reticulated water and sewer services and the vast majority of lots do not have reticulated stormwater services.

Southern Beaches properties must therefore manage water, sewer and stormwater onsite consistent with the current planning and plumbing requirements.

The planning scheme includes a Specific Area Plan which regulates applications for new buildings, extensions and changes of use.  More detail is available here.