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.

Modeling corn growth and root zone salinity dynamics to improve irrigation and fertigation management under semi-arid conditions View PDF on NORA
Nitrogen fertiliser interactions with urine deposit affect nitrous oxide emissions from grazed grasslands View PDF on NORA
Impacts of riverine sand mining on freshwater ecosystems: a review of the scientific evidence and guidance for future research View PDF on NORA
An assessment of chamber 14C methodologies for sampling aquatic CO2 evasion View PDF on NORA
PopFor: a new model for estimating poplar yields View PDF on NORA
A framework for nitrogen futures in the shared socioeconomic pathways View PDF on NORA
Ecological risk assessment of fifty pharmaceuticals and personal care products (PPCPs) in Chinese surface waters: a proposed multiple-level system View PDF on NORA
View PDF on NORA
Interpreting insect declines: seven challenges and a way forward View PDF on NORA
Using high-frequency phosphorus monitoring for water quality management: a case study of the upper River Itchen, UK View PDF on NORA
Civil disobedience movements such as School Strike for the Climate are raising public awareness of the climate change emergency View PDF on NORA
Dry deposition of ozone over land: processes, measurement, and modeling View PDF on NORA