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The ERIC flash-flood method is described in ERIC flash flood forecasting.
Two ERIC products exist:
Reporting points (“ERIC Reporting Points” layers): points in the river network (where the catchment area is <=2000 km2) where flash flooding is possible. Enlarged triangles highlight where the flash flood forecast probability over the next 5 days meets certain criteria:
1. probability of exceeding a 5 year return period magnitude of the surface runoff index is forecasted to be greater than or equal to 30%
2. lead time of the above criterion being satisfied is <= 48 hours in a region for which an EFAS partner exist
Affected area (“ERIC Affected Area”): river network which contributes to each ERIC reporting point, i.e. areas at risk from flash flooding (“ERIC Affected Area”)
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Three ERICHA products exist:
- Hourly precipitation maps : Hourly precipitation totals from the OPERA radar composite, updated every 15 minutes (“ERICHA hourly accumulation precipitation” layer).
- Flash flood hazard maps : Sections of the river network highlighted because their flash flood forecast probability over the next 4 hours meets certain criteria. The thresholds are based on regional climatic characteristics and river basin upstream area as published by the MeteoAlarm consortium (“ERICHA - FF hazard levels forecasts” layer).
- Daily precipitation maps : Daily gauge-adjusted radar rainfall accumulation over the last 24 hours ("ERICHA 24-h accumulations" layer).
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