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Investigations of flooding incidents

Updated 14 September 2015

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About investigations of flooding incidents

As a Lead Local Flood Authority we have incidents of flooding reported to us, we log these incidents that can range in extent and severity and obtain as much information as possible about what happened. We are not responsible for:

After these have been logged we then review and identify whether any further investigation is required this may mean that no further investigation is undertaken.  We may however:

Guidance on on formal flood investigation and reporting

Lead Local Flood Authorities (LLFA) investigate flooding incidents in their area to identify which organisation is responsible for the relevant flood risk management function and what that organisation has done or intends to do. The LLFA will then publish the results of any investigation, and notify any relevant risk management authorities.

This complies with the Flood and Water Management Act 2010 which says:

“On becoming aware of a flood in its area, a lead local flood authority must, to the extent that it considers it necessary or appropriate, investigate:

(a) which risk management authorities have relevant flood risk management functions, and
(b) whether each of those risk management authorities has exercised, or is proposing to exercise, those functions in response to the flood.”

The duty is not to investigate the flood event itself. That happens already under other emergency planning procedures and legislation. The role of the LLFA is to investigate the process by which the various flood risk management authorities undertook their duties in responding to the flood in order to learn lessons which can minimise flood risk in future.

Guidance is now available to identify whether a flood is likely to be considered significant enough to trigger a flood investigation under the Flood and Water Management Act 2010 and is available below:

If you wish to report a flood that you feel meets the requirements of the guidance please complete the flood reporting template and forward to

The results of any investigations carried out will be published as they are completed.

What should I do if the flood event was not ‘significant’?

The simplest way to report a flooding incident is through the website using the online flooding/drainage problems form

Alternatively email the flood and water team at

Buckskin flood investigation 2014

Romsey flood investigation 2014

Phase One documents

Phase Two documents

St Mary Bourne flood investigation 2012/13

Thornford Road Ford flood investigation 2012


Hambledon street

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