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.

A vision for hydrological prediction View PDF on NORA
Evidence of ozone-induced visible foliar injury in Hong Kong using Phaseolus vulgaris as a bioindicator View PDF on NORA
Atlas of the mammals of Great Britain and Northern Ireland View PDF on NORA
MICESE: a new method used for the formulation of key messages from the scientific community for the EU post 2020 Biodiversity Strategy View PDF on NORA
HydroSOS – the Hydrological Status and Outlook System towards providing information for better water management View PDF on NORA
Hydrological summary for the United Kingdom: February 2020 View PDF on NORA
Identifying causes of low persistence of perennial ryegrass (Lolium perenne) dairy pasture using the Basic Grassland model (BASGRA) View PDF on NORA
Quantifying uncertainty for estimates derived from error matrices in land cover mapping applications: the case for a Bayesian approach View PDF on NORA
The phenology of an urban street flora: a transect study View PDF on NORA
Validation of demographic equilibrium theory against tree-size distributions and biomass density in Amazonia View PDF on NORA
Heritable genetic variation but no local adaptation in a pine-ectomycorrhizal interaction View PDF on NORA
Assessing the role of high-speed rail in shaping the spatial patterns of urban and rural development: a case of the middle reaches of the Yangtze river, China View PDF on NORA