Live levels from the Environment Agency's groundwater monitoring network. Groundwater is the water held in underground rock (aquifers). When the water table in a chalk or limestone aquifer is high, the ground is saturated and rivers respond harder to rain — and in some valleys the groundwater itself emerges to cause groundwater flooding. Levels are in metres above sea level (mAOD). Click a borehole for its level history.
Source: Environment Agency Hydrology API. Only boreholes with a reading in the last 30 days are shown on the map and list (302 of 3,610); the rest are monitored less frequently or are dormant. Borehole levels reflect the local aquifer, not any single river.
