- 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?
Rivers - Is River Flow Always A Function Of River Level?
Created: 20 November 2018 Updated: 30 March 2023
As flow is a function of river level and velocity it is possible to get different values of flow for the same level. This can happen if the characteristics of a river channel, for example, the shape or roughness of the channel, change as the result of a flood or from the growth of vegetation. Most level monitoring sites are located in relatively stable stretch of river to help minimise this.