Groundwater

Portsmouth City Council has been monitoring groundwater levels in Portsmouth to help reduce the risk of flooding.

This work began as part of a preliminary groundwater investigation in the Local Flooding Risk Management Strategy. The latest study Groundwater Levels Trends in Portsmouth 2019-2024 builds on the earlier work from 2014-2019.

We’ve identified the areas most at risk. This helps us understand the causes, probability, and the impact of groundwater flooding now and in the future, and supports our efforts to reduce flood risk across the city.

Documents

Groundwater Levels Trends in Portsmouth 2019-2024

North Portsmouth map

Central Portsmouth map

Southern Portsmouth map

Cross section locations

Line 1 North-South (East) Groundwater

Line 2 West-East (South) Groundwater

Line 3 North-South (West) Groundwater 

Line 4 West to East (North) Groundwater

Stanley avenue map

Appendix – sampling methods

Appendix – water level measurements certificate

Appendix – borehole geology

Appendix – hydrographs

Appendix – salinity graphs