Monthly Hydrological Summaries

Logo for the National Hydrological Monitoring Programme

The National Hydrological Monitoring Programme (NHMP) produces the monthly Hydrological Summary of the UK. This regular report describes the hydrological conditions during the preceding month, using the data holdings of the National River Flow Archive and National Groundwater Level Archive. Focusing on rainfall, river flows, groundwater levels, and reservoir stocks, it places the events of each month, and the conditions at the end of the month, in a historical context. 

Each report includes regional rainfall data - both recent and, where significant, longer-term accumulations for the major administrative divisions in the water industry. Also featured are maps and representative hydrographs of river flow and groundwater levels with supporting summary statistics and details of current stocks for a selection of major reservoirs. A commentary examines notable hydrological events and summarises both the national hydrological status and the water resources outlook. 

The Hydrological Summary is published on the 10th working day every month via this web-page, Twitter, and to those who have signed up to receive them by email. 


Sign up to receive the monthly Hydrological Summary by email.

Latest month 

The Hydrological Summary for the latest month can be downloaded at the below link:

Latest Hydrological Summary for the UK

The latest Hydrological Summary will also be available in the NERC Open Research Archive (NORA) and displayed in the below list soon after publication. 


Archived versions of the Hydrological Summary are available in pdf format from December 1988. To access hydrological summaries from the archive, please use the below list.

Right place. Right time. Right tool: guidance for using target analysis to increase the likelihood of invasive species detection View PDF on NORA
Assessing the utility of land sharing and land sparing for birds, butterflies and ecosystem services in lowland England View PDF on NORA
Summer soil drying exacerbated by earlier spring greening of northern vegetation View PDF on NORA
Sensor data and metadata standards review for UKCEH View PDF on NORA
Legumes increase grassland productivity with no effect on nitrous oxide emissions View PDF on NORA
Metal bioavailability models: current status, lessons learned, considerations for regulatory use, and the path forward View PDF on NORA
An assessment of the performance of the PLUS+ tool in supporting the evaluation of Water Framework Directive compliance in Scottish standing waters View PDF on NORA
Invasion of freshwater ecosystems is promoted by network connectivity to hotspots of human activity View PDF on NORA
Transpiration from subarctic deciduous woodlands: environmental controls and contribution to ecosystem evapotranspiration View PDF on NORA
Light availability and land‐use history drive biodiversity and functional changes in forest herb layer communities View PDF on NORA
Estimation of WHAM7 constants for GaIII, InIII, SbIII and BiIII from linear free energy relationships, and speciation calculations for natural waters View PDF on NORA
Introduced plants as novel Anthropocene habitats for insects View PDF on NORA