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.

Challenges, gaps and opportunities in investigating the interactions of ozone pollution and plant ecosystems View PDF on NORA
Science needs for Indian water security View PDF on NORA
Briefing note. Severity of the February 2020 floods - preliminary analysis View PDF on NORA
Trends and patterns in surface water chemistry in Europe and North America between 1990 and 2016, with particular focus on changes in land use as a confounding factor for recovery View PDF on NORA
JULES-BE: representation of bioenergy crops and harvesting in the Joint UK Land Environment Simulator vn5.1 View PDF on NORA
Hydrological outlook UK - March 2020 View PDF on NORA
Climatic and anthropogenic regulation of carbon transport and transformation in a karst river-reservoir system View PDF on NORA
Global lake thermal regions shift under climate change View PDF on NORA
Storm impacts on phytoplankton community dynamics in lakes View PDF on NORA
COSMOS-UK. Soil moisture: February 2020 View PDF on NORA
Corticosterone mediates telomere length in raptor chicks exposed to chemical mixture View PDF on NORA
Modeling corn growth and root zone salinity dynamics to improve irrigation and fertigation management under semi-arid conditions View PDF on NORA