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- 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 Greenwich Mean Time (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?
- Rainfall - how do I download historic rainfall data?
- 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?
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- Water Quality - how is the data different to the Water Quality Archive data?
- Water Quality - how often do we take readings?
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.