Members of the Southwell Flood Forum have received training in road closures in advance of any potential flooding this winter.
The town was badly affected last Summer after four inches of rain fell in just an hour, leaving more than 200 homes damaged.
Volunteers will now be able to put up warning signs and close roads if similar conditions occur again, once consent has been given from local authorities.
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Five men and a woman died in the crash. A 22-year-old man remains in a serious condition in hospital.
A taxi driver killed in a multi-car crash had been on his last job of the evening. His daughter's birthday is today.
Cold and frosty initially. Dry and fine conditions through the day.