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.

COSMOS-UK. Soil moisture: November 2019 View PDF on NORA
The JNCC terrestrial biodiversity surveillance schemes: an assessment of coverage View PDF on NORA
The potential role of sediment organic phosphorus in algal growth in a low nutrient lake View PDF on NORA
View PDF on NORA
Genetic, epigenetic and microbiome characterisation of an earthworm species (Octolasion lacteum) along a radiation exposure gradient at Chernobyl View PDF on NORA
Microplastic particles reduce reproduction in the terrestrial worm Enchytraeus crypticus in a soil exposure View PDF on NORA
Understanding spatial variability of methane fluxes in Arctic wetlands through footprint modelling View PDF on NORA
Sympatric Atlantic puffins and razorbills show contrasting responses to adverse marine conditions during winter foraging within the North Sea View PDF on NORA
Investigating combined toxicity of binary mixtures in bees: meta-analysis of laboratory tests, modelling, mechanistic basis and implications for risk assessment View PDF on NORA
Microbial utilization of low molecular weight organic carbon substrates in cultivated peats in response to warming and soil degradation View PDF on NORA
Machine learning and artificial intelligence to aid climate change research and preparedness View PDF on NORA
A framework linking ecosystem services and human well‐being: saltmarsh as a case study View PDF on NORA