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Ground water information & flooding

The Flood & Emergency Group of the parish council monitors groundwater information at various points through the parish and the published data from the borehole at Vernham Dean.

Groundwater levels are high and the river is flowing well through the parish.  The Environment Agency deployment trigger point has been reached (level measured at the Holdway Cottages gauge is over 78.5m) and they have deployed the flood barrier at Spring Hill Lodge.

Please contact the parish office if you have any questions or concerns about the situation.  The parish council does have a small stock of sandbags available to help protect vulnerable residents in the most vulnerable homes if the situation worsens, and can get more from Basingstoke and Deane Borough Council if widespread problems develop.  You should read through the guidance below on what practical actions you can take to prepare if your home is at risk of ground water flooding.

There are currently an Environment Agency flood alert in place as follows:

Flood Alert in force: Groundwater flooding in Vernham Dean, Upton and the Bourne Valley, updated Wednesday 8 April.

Flooding is possible for: Communities at risk of groundwater flooding in Vernham Dean, Upton and the Bourne Valley in North Hampshire including Hurstbourne Tarrant and St Mary Bourne.   

Be prepared.

At Vernham Dean and in Upton, the groundwater level continues to fall. In the last 5 days, the level has reduced by 1.3m at Vernham Dean. Over the next 5 days, the weather is mostly dry, but it will be interspersed with periods of showery rain, especially through Easter weekend. Given the current forecast totals, the rainfall should not cause groundwater levels to rise. By the end of this week (and if it hasn’t already) groundwater should stop causing impacts to property in Upton. It will probably be another 3 to 4 weeks before the sewerage network can function more normally. Next week, as long as the weather forecast remains favourable, then we will remove this Alert. This Flood Alert will be updated or removed by 15:00 on Wednesday 15/04/2020‚Äč.

The latest information from the Environment Agency on groundwater can be found here

https://www.gov.uk/government/statistics/hampshire-groundwater

You can sign up for flood alerts here

https://www.gov.uk/sign-up-for-flood-warnings

The latest data for the ground water levels at the Holdway Cottages gauge can be found here.  This is the site the Environment Agency use as the trigger point for the deployment of their Temporary Defence Deployment Plan (which you can see below)

https://flood-warning-information.service.gov.uk/station/9231

Here is another useful site presenting the ground water levels at the Holdway Cottages with additional historic data and narrative

https://riverlevels.uk/hampshire-st-mary-bourne-st-mary-bourne-rl#.XiApQS10faZ

The latest data for the ground water levels at Vernham Dean can be found here

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/856672/Vernham_Dean_GW.pdf