Why is Council getting new flood information?
What is a Land Information Memorandum (LIM)? Does this information need to appear on a LIM? What would the LIM say?
How is this information being used in the Proposed District Plan?
What is the difference between 'hazard' and 'risk'?
I am on a hill or a long way from the Waikato River, how can my land possibly be affected by flooding?
How does this affect property values?
How does this affect insurance?
What is an 'extreme rainfall event' (1 in 100 year flood event)?
Why is Council using a 1 in 100 year flood event?
What is involved in modelling a 1 in 100 year flood event?
How do I get more detailed information about the modelling process and the model outputs?
What do the different 'flood hazard areas' mean?
When was the last 1 in 100 year event? Why can’t we use this as an example?
How has the flood information been refined since its first release in April 2012?
Why is there detailed modelling for only parts of the City? Is Council going to investigate flood hazards further?
What will Council do to fix the flooding?
I’m in a proposed flood hazard area, does this mean I have to move out or raise the floor levels of existing buildings?
If only part of my property is affected what does this mean?
Will my house be flooded?
What is freeboard? When and why is it required?
Is Council going to investigate potential flood hazards further?
For which parts of the city has the flood hazard modelling been completed?
Why are we updating the flood hazard information?
Why is Council not using all the new flood hazard information?
How many properties are affected by the flood information?
Can I talk to the Council about the maps?
If the flood information is based on a computer model and engineer’s assumptions, how accurate is it likely to be?
Does this flood information mean that the stormwater system is inadequate?
1. Why is Council getting new flood information?
Council is preparing Catchment Management Plans for the city. These are required as part of the stormwater discharge consent requirements imposed by the Regional Plan. As a result, Council’s knowledge of potential flooding areas is growing and new flood mapping is being produced.
Council has used this information as part of the review of the District Plan. The flooding information will be considered alongside new subdivisions and development of land potentially affected.
2. What is a Land Information Memorandum (LIM)? Does this information need to appear on a LIM? What would the LIM say?
A LIM is a report prepared by Council which summarises a range of information on a property, available at the time it is issued. A LIM is issued for a whole property (title) and cannot ‘exclude’ parts of land within that property. For example, in a cross lease situation the LIM will provide information relevant to the whole title, not just individual houses or parts of the land defined in a cross lease plan.
It is a legal requirement to provide LIMs and the types of information that must be included are set out in the Local Government Official Information and Meetings Act 1987. LIMs outline all information a council holds on a property, including permitted land use, consents, storm water and sewer drains, rating information and potential natural hazard risk including erosion and flood risks. They are most commonly requested by potential property purchasers.
As the flood hazard areas are identified in the Proposed District Plan maps the LIM will simply refer to any flood hazard area type relevant to the property for which the LIM has been requested.
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3. How is this information being used in the Proposed District Plan?
The Proposed District Plan was publicly notified for submissions on 10 December 2012 and uses flood information to define flood hazard areas including objectives, policies and rules specific to each hazard area. This sets out what requirements must be met, whether resource consent is required, and what is considered to decide whether to grant or decline resource consent.
The proposed approach is that new subdivision, use and development should avoid areas subject to flood hazards if the level of risk is unacceptable. Refer to Chapter 22 and the features maps of the Proposed District Plan for details.
|0 to 10cm
||At this depth, surface water is unlikely to be a hazard to people and unlikely to cause damage to property. |
|10 to 50cm
||At this depth and velocity flood hazards are normally traversable by emergency vehicles and damage to property is minor to moderate. People can usually stand but more vulnerable people can be more significantly affected (e.g. children, elderly, injured, physically disabled). Scour/erosion of building foundations are unlikely to occur.|
|50 to 100cm
||At this depth and velocity the stability of people in water is at risk. |
Damage to property can be financially significant.
||At velocities greater than 2 metres per second the stability of buildings and their foundations can be significantly affected, as the force of the water can scour building supports. At depths greater than 1m significant damage to building and risk to life is very likely. |
The effect on property depends in part on the floor height of a building. Where the water is not flowing (i.e. ponding) a building with floor heights above the height of the flood water and an adequate freeboard is unlikely to suffer significant damage, whereas a building with floor heights below the height of the water is likely to suffer inundation damage (e.g. water and silt damage).
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22. Is Council going to investigate potential flood hazards further?