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In England and Wales, the Environment Agency requires a professional Flood Risk Assessment (FRA) to be submitted alongside planning applications in areas that are known to be at risk of flooding (within flood zones 2 or 3) and/ or are greater than 1ha in area, planning permission is not usually granted until the FRA has been accepted by the Environment Agency.
The software incorporates a user interface for building, running and viewing the results of models, including a GIS map interface. The software has been independently benchmarked [1] by the Environment Agency and is used extensively [2] to undertake modelling of flood risk, [3] develop flood risk management schemes and provide flood forecasting ...
In the UK, the Environment Agency has produced maps which show areas at risk. The map to the right shows a flood map for the City of York, including the floodplain for a 1 in 100-year flood (dark blue), the predicted floodplain for a 1 in 1000 year flood (light blue) and low-lying areas in need of flood defence (purple). The most sustainable ...
Risk-based cost of insurance. This is the full actuarial rate calculated by FEMA under the new risk plan based on expected losses. Due to state subsidies, most policyholders pay below this amount.
A 100-year flood is a flood event that has on average a 1 in 100 chance (1% probability) of being equaled or exceeded in any given year. [1] A 100-year flood is also referred to as a 1% flood. [2] For coastal or lake flooding, a 100-year flood is generally expressed as a flood elevation or depth, and may include wave effects. For river systems ...
A flood insurance rate map (FIRM) is an official map of a community within the United States that displays the floodplains, more explicitly special hazard areas and risk premium zones, as delineated by the Federal Emergency Management Agency (FEMA). [1]
Geographic information system (GIS) is a commonly used tool for environmental management, modelling and planning. As simply defined by Michael Goodchild, GIS is as "a computer system for handling geographic information in a digital form". [1] In recent years it has played an integral role in participatory, collaborative and open data philosophies.
The Floodline is the flood warning and information service used in the United Kingdom to issue flood alerts and warnings to the public, emergency organisations and businesses. The system uses observed data from rain, river and coastal gauges, combined with weather forecasts to accurately predict the likelihood and timing of flooding.