Wales Fluvial Flow Database (WFFD)
River peak flow estimates and hydrographs used in Flood Risk Assessment Wales (FRAW, 2019) and covering watercourses with a catchment area greater than 3km2.
Estimates created at regular intervals along a watercourse and stored in an ESRI Arc file geodatabase. At each interval (node) a variety of information is provided that includes:
- catchment descriptors extracted from FEH.
- donor observation gauges used within the flow estimation calculations.
- the donor observation gauges used within the flow estimation calculations.
- the time to peak and storm duration for the hydrographs and the calculated peak flows and hydrographs for each return period (both from the statistical and hybrid methodologies).
- information about the quality control checks carried out on each point, a decision log outlining any changes taken on each WFFD point before use in the FRAW project, and the final modelled inflow polygons used in the FRAW fluvial hydraulic models.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS161397
- Alternative Title
-
- Metadata Language
- English
- Lineage
-
The WFFD was created to provide national-scale river peak flow estimates for FRAW. It is based on data and flood estimation methodologies available in 2017. There has been no verification of the estimated peak flows against observed flows from telemetry gauges or local modelling studies.
The WFFD does not provide detailed flow estimates required for local modelling studies and estimates could be refined by more detailed investigation and more recent datasets and methodologies. Existing WFFD estimates should either be reviewed to demonstrate they remain appropriate or new estimates should be created
- Dataset Reference Date (Creation)
- 2025-10-16
Temporal Extent
- Begin date
- 2017-07-14
- End date
- 2019-10-18
- Topic category
-
- Inland waters
- Environment
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
- Format Type and Description
-
-
Geographic Information System
(
Unknown
)
-
Geographic Information System
(
Unknown
)
Quality
Data quality
- Quality Scope
- Dataset
- Conformity
- Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Explanation
-
This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
-
The WFFD was created to provide national-scale river peak flow estimates for FRAW. It is based on data and flood estimation methodologies available in 2017. There has been no verification of the estimated peak flows against observed flows from telemetry gauges or local modelling studies.
The WFFD does not provide detailed flow estimates required for local modelling studies and estimates could be refined by more detailed investigation and more recent datasets and methodologies. Existing WFFD estimates should either be reviewed to demonstrate they remain appropriate or new estimates should be created
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
-
NRW Thesaurus
-
- river flows
- flood risk
- flood risk management
- Type
- Theme
Citation
- Date (Publication)
- 2026-01-16
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Use Constraints
- Use constraints type
- Other restrictions
Licence
- Other constraints
- NRW Conditional