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.

Agricultural and urban delivered nitrate pollution input to Mediterranean temporary freshwaters View PDF on NORA
Questioning the link between tenure security and sustainable land management in cocoa landscapes in Ghana View PDF on NORA
View PDF on NORA
A system of metrics for the assessment and improvement of aquatic ecosystem models View PDF on NORA
Contrasting responses of macro- and meso-fauna to biochar additions in a bioenergy cropping system View PDF on NORA
Hydrological summary for the United Kingdom: May 2020 View PDF on NORA
How to transition to reduced-meat diets that benefit people and the planet View PDF on NORA
Impacts of metallic trace elements on an earthworm community in an urban wasteland: emphasis on the bioaccumulation and genetic characteristics in Lumbricus castaneus View PDF on NORA
Environment and food web structure interact to alter the trophic magnification of persistent chemicals across river ecosystems View PDF on NORA
Effects of a nitrification inhibitor on nitrogen species in the soil and the yield and phosphorus uptake of maize View PDF on NORA
A biological and nitrate isotopic assessment framework to understand eutrophication in aquatic ecosystems View PDF on NORA
Managing health risks of perfluoroalkyl acids in aquatic food from a river-estuary-sea environment affected by fluorochemical industry View PDF on NORA