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.

Lung function and microbiota diversity in cystic fibrosis View PDF on NORA
COSMOS-UK. Soil moisture: March 2020 View PDF on NORA
Grazing reduces bee abundance and diversity in saltmarshes by suppressing flowering of key plant species View PDF on NORA
The probability of breaching water quality standards – a probabilistic model of river water nitrate concentrations View PDF on NORA
The influence of land cover data on farm-scale valuations of natural capital View PDF on NORA
Melatonin enhances drought resistance by regulating leaf stomatal behaviour, root growth and catalase activity in two contrasting rapeseed (Brassica napus L.) genotypes View PDF on NORA
View PDF on NORA
Simulating the summer feeding distribution of Northeast Atlantic mackerel with a mechanistic individual-based model View PDF on NORA
Key actions for a sustainable chemicals policy View PDF on NORA
Dynamics of dissolved organic matter in headwaters: comparison of headwater streams with contrasting DOM and nutrient composition View PDF on NORA
First biologging record of a foraging red-throated loon Gavia stellata shows shallow and efficient diving in freshwater environments View PDF on NORA
Impact of forest plantation on methane emissions from tropical peatland View PDF on NORA