Flood Warning - Description


The task of flood warning divided into two parts:

  • decisions to escalate or change the state of alertness internal to the flood warning service provider, where this may sometimes include partner organisations involved in emergency response;
  • decisions to issue flood warnings to the general public.

The decisions made by someone responsible for initiating flood warnings must be influenced by a number of factors, which include:

  • The reliability of the available forecasts and how this changes with lead-time.
  • The amount of time that the public would need to respond effectively to a warning.
  • The delay between a warning being initiated and it being received by the public.
  • The need to avoid issuing warnings unnecessarily, because of the wasted efforts of those who respond and because a record of false alarms means that fewer would respond to future warnings.
  • The need to avoid situations where a warning condition is rescinded only for the warning to be re-issued within a short time, again because of the wasted efforts of the general public and because such occurrences would bring the flood warning service into disrepute.

A computer system for flood warning will usually contain sub-systems for:

  • flood forecasting;
  • automatic alerting of internal staff;
  • tracking of alert messages and acknowledgements received;
  • diversion of messages to alternates where no acknowledgement received.

Read more about this topic:  Flood Warning

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