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.

The importance of variation in offspring body size for stability in cannibalistic populations View PDF on NORA
Investigating potential future changes in surface water flooding hazard and impact View PDF on NORA
How contemporary bioclimatic and human controls change global fire regimes View PDF on NORA
Global change effects on plant communities are magnified by time and the number of global change factors imposed View PDF on NORA
Hydrological forecasts and projections for improved decision-making in the water sector in Europe View PDF on NORA
Data science of the natural environment: a research roadmap View PDF on NORA
Multiple host use and the dynamics of host switching in host–parasite systems View PDF on NORA
Interaction of Convective Organisation with Monsoon Precipitation, Atmosphere, Surface and Sea: the 2016 INCOMPASS field campaign in India View PDF on NORA
Supporting Spartina: interdisciplinary perspective shows Spartina as a distinct solid genus View PDF on NORA
Nuclear and plastid SNP markers for tracing Cedrela timber in the tropics View PDF on NORA
Soil nematode abundance and functional group composition at a global scale View PDF on NORA
Impact of the spatial uncertainty of seed dispersal on tree colonization dynamics in a temperate forest View PDF on NORA