We provide bus services in Queenstown and Dunedin to help you get to where you need to go. Our journey planner can help you figure out which bus route is best for you. For those unable to access the bus service we administer the Total Mobility scheme which provides access to subsidised taxi fares.
The Water of Leith rises in north Dunedin, and flows 14km through the City. It is a stream with the potential to inflict serious damage to property on the floodplain. We manage a flood scheme on the Water of Leith to reduce the risk and impact of flooding.
Before the 1929 Dunedin flood, concrete and stone walls had already been built along the banks of the river to prevent bank erosion and enable better use of adjoining land. The Otago Harbour Board had constructed a concrete channel from Forth Street to the harbour in 1913 -14.
Straight after the 1929 flood the concrete channel was duplicated from Forth Street to the harbour. Concrete and stone walls along the channel were strengthened and raised. In the early 1950s the Dunedin City Council extended the channel upstream of Forth Street.
In the late 1950s the Water of Leith channel from George Street to Great King Street was straightened by building a high velocity concrete channel. Boulder traps were built upstream of George Street and in the late 1960s a larger boulder trap was built upstream of the lower Malvern Street bridge.
Leith construction, 1950s
Clearing the Leith riverbed after the flood, 1929
The largest floods in the Leith typically occur when fronts bringing persistent heavy rainfall pass from east to west over the catchment. Flood events are caused by rainfall that can either be of a short duration and high intensity, low intensity and steady rate, medium intensity with a duration of several hours, or a combination of these conditions.
The relatively small and steep catchment can produce significant flooding in just a few hours after the onset of heavy rain, giving little warning. Likewise, the duration of peak flows is also brief.
There characteristics mean the Leith can easily become a raging torrent. The water surface under flood conditions is likely to be highly turbulent throughout most reaches, with large standing waves observed in some locations.
Damaging floods have been recorded in the Leith in 1868, 1877, 1911, 1923 and 1929. The 1929 flood was the most severe on record, with floodwaters sweeping away and damaging bridges and other channel structures, affecting numerous houses and flowing along the streets beyond lower Rattray Street.
Development of the current scheme
We manage a flood protection scheme on the Water of Leith which is designed to cope with a flow of 171 cumecs (cubic metres per second). This flow has an Average Recurrence Interval (ARI) of 100 years.
Extensive hydraulic modelling, using both computer and physical models was carried out to determine the level of a 100 year ARI design event for different reaches of the Leith. The hydraulic model's development and verification was based on observations and data collected during past flooding in the Leith.
The video below is a physical model built during the development phase of the current scheme.
The work on the development of the scheme has been spread over a number of years as outlined below:
Anzac Av - Harbour (weir installation)
Cumberland St - Dundas St
Leith Walk - Forth St
St David St - Union St
Dundas St - St David St
Union St - Leith Walk (ITS building bend)
Dundas St Culvert
Forth St - Harbour
Map of work programme
Union St to Leith Walk 2017/8 - Construction Programme
Constructing site access from Clyde Street
Construction of a new retaining wall and terraces along left bank
Public access to riverbed from left bank
Shaping, stabilizing and rebuilding weirs to stabilize river bed
Raising the wall along the right bank to increase freeboard (the height of the channel wall above the flood level)
How much has the Leith Flood Protection Scheme cost?
Below is an outline of the costings of the scheme from 2005 - June 2018.
To view more information about the Leith Flood Protection Scheme please see the link below:
Love Your Leith is our community engagement for the Leith Amenity Project. This project is one of the final stages of the Leith Flood Protection Scheme, and aims to enhance the amenity, public access and ecology of the lower reaches of the river, between Forth Street and the harbour mouth.