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.

Predicting acute contact toxicity of organic binary mixtures in honey bees (A. mellifera) through innovative QSAR models View PDF on NORA
Bending the curve of global freshwater biodiversity loss: an emergency recovery plan View PDF on NORA
‘Remote’ behavioural ecology: do megaherbivores consume vegetation in proportion to its presence in the landscape? View PDF on NORA
Modelling the functional connectivity of landscapes for greater horseshoe bats Rhinolophus ferrumequinum at a local scale View PDF on NORA
Precipitation chemistry and atmospheric nitrogen deposition at a rural site in Beijing, China View PDF on NORA
Nitrogen and sulfur deposition over a region in SW Europe based on a regional atmospheric chemical transport model View PDF on NORA
Rainforest-like atmospheric chemistry in a polluted megacity View PDF on NORA
Effects of acidity on dissolved organic carbon in organic soil extracts, pore water and surface litters View PDF on NORA
Hydrological outlook UK - February 2020 View PDF on NORA
Two-phase object-based deep learning for multi-temporal SAR image change detection View PDF on NORA
COSMOS-UK. Soil moisture: January 2020 View PDF on NORA
Photochemical emission and fixation of NOX gases in soils View PDF on NORA