The areas under threat are Yalding, Allington and parts of Maidstone with Smarden and Headcorn are on alert too. Other areas include the upper River Medway from Forest Row to Penshurst, including Ashurst.
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Tuesday's weather for the west of the region
Tuesday's weather for the east of the region
A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.