Latest GW Flooding Briefing

We attach our Groundwater Briefing Note for Hampshire.

The beginning of 2026 was very wet, with almost all rain gauges in Hampshire recording more than double the average rainfall expected across these two months. March 2026 was drier than normal and in April 2026, almost no rain has been recorded. Groundwater levels across Hampshire peaked either in late February or early-to-mid March and have been slowly falling since.

In most years, groundwater levels typically reach a peak in March or early April and then start to fall as winter rain eases, temperatures rise, and plants stat to grow and take up water. We expect groundwater levels across Hampshire to continue falling slowly and any residual flooding impacts will decrease over the coming weeks.

With the situation improving, we do not plan to issue another Groundwater Briefing Note in the coming weeks. We will next update this Briefing Note during the early part of the next winter season as groundwater levels begin to rise and flood risk increases.

We advise that residents and communities susceptible to groundwater flooding review plans and check flood resilience equipment before the next winter season.