- General - Definitions Of The Quality Flags
- General - How Accurate Is The Data?
- General - How Can I Download The Data?
- General - How Often Is The Hydrometric Data Updated?
- General - I Have An Abstraction Licence. Can I Use This Information?
- General - Is All The Hydrological Data Recorded In GMT?
- General - What Is A Water Day?
- General - What Is Sub-Daily Data?
- General - What Is The Difference Between Checked And Unchecked Data?
- Groundwater - What Does MAOD Mean?
- Groundwater - What Is Borehole Depth?
- Groundwater - What Is The Difference Between Dipped, Logged And Telemetered Data?
- Groundwater - Why Are There Sometimes Differences Between Dipped And Groundwater Telemetered Data At The Same Site?
- Rivers - Is River Flow Always A Function Of River Level?
- Rivers - There Are Differences Between The Data Available On The Environment Agency’s Website And The National River Flow Archive, Which Time Series Should I Use?
- Rivers - What Is The Difference Between River Level And River Flow?
- Rivers - Why Do River Levels Or Flow Sometimes Increase Or Decrease Unexpectedly?
- Rivers - Why Is 15 Minute (Instantaneous) Flow Data Only Available For A Small Number Of Stations?
- Rivers - Why Is Real-Time Flow Data Only Available For A Small Number Of Stations?
- Water Quality - How Accurate Is The Data?
- Water Quality - How Are The Water Quality Sites Selected?
- Water Quality - How Do I Analyse The Data?
- Water Quality - How Is The Data Different To The Water Quality Archive (WIMS) Data?
- Water Quality - How Often Do We Take Readings?
- Water Quality - What Water Quality Data Is Available?
General - How Often Is The Hydrometric Data Updated?
Created: 15 November 2018 Updated: 30 March 2023
The frequency of the updates is site specific, depending on the equipment at the site, how often there is an internet or phone signal at the site and how our software is configured.
Updates will vary from every 15 min through to monthly (except for manually dipped boreholes) a couple of times per year. Below are some rules of thumb but these will not apply to every site.
River flow (m3s-1):
A) several times per day: updates from telemetry (15 min data) for stations in Wessex and Devon and Cornwall.
B) daily: updates of daily mean values from the EA’s hydrometric archive
C) monthly: updates of 15 min data, day max and day min for all flow sites.
River level (m):
A) several times per day: updates from telemetry (15 min data).
B) monthly: updates of 15 min data, day max and day min from the EA’s hydrometric archive
Rainfall (mm):
A) several times per day: updates from telemetry (15 min data).
B) daily: updates of daily totals from the EA’s hydrometric archive
C) monthly: updates of 15 min data from the EA’s hydrometric archive
Groundwater (mAOD):
A) several times per day: updates from telemetry for some stations (15 or 60 min data)
B) weekly: updates of dipped data from the EA’s hydrometric archive
C) monthly: updates of high-resolution data from the EA’s hydrometric archive