Understanding Flood Terms[1]
Minor Flooding - Causes
inconvenience. Low-lying areas next to watercourses are inundated which may
require the removal of stock and equipment. Minor roads may be closed and
low-level bridges submerged.
Moderate Flooding - In addition to the above, the evacuation of some houses may be required.
Main traffic routes may be covered. The area of inundation is substantial in
rural areas requiring the removal of stock.
Major Flooding - In addition
to the above, extensive rural areas and/or urban areas are inundated.
Properties and towns are likely to be isolated and major traffic routes likely
to be closed. Evacuation of people from flood-affected areas may be required.
Local Flooding - Used where
intense rainfall could be expected to cause high runoff in limited areas local
to the rainfall, but not necessarily leading to significant rises in main
streams.
Flash Flooding - Flooding
occurring in less than 6 hours of rain, usually the result of intense local
rain and characterised by rapid rises in water levels. They are difficult to
predict accurately and give little time for effective preventative action.
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