Home › attribute › fri
Flood Recurrence Interval (FRI)
DGIF baseline 2026-1, the latest. Earlier baselines: timemap.
RDF: fri.ttl
- Name
floodRecurrenceInterval- Datatype
- Enumeration
- Definition
- A statistical measure representing the average time span between flood events of a specific magnitude.
- Description
- Flood recurrence intervals assess flood risk by expressing the average period between events of a given size. Standard intervals are typically based on USGS and FEMA data, while the inclusion of a 20-year interval is supported by regional studies to better reflect local hydrologic conditions.
- Accepted
- 2025-04-23
- Defined by
- USGS
- Values
- FRI_1 Two Year Recurrence
- FRI_2 Five Year Recurrence
- FRI_3 Ten Year Recurrence
- FRI_4 Twenty Five Year Recurrence
- FRI_5 Twenty Five Year Recurrence
- FRI_6 Fifty Year Recurrence
- FRI_7 One Hundred Year Recurrence
- Used by
- BH090 Land Subject to Inundation
Source: DGIF 2026-1 QEA model, DGIWG. Standard: DGIWG 206-3. Licence: CC BY 4.0, © DGIWG.