| ArcGIS REST Services Directory | Login | Get Token |
| Home > services > CRMP2_FloodHazard > Rainfall_FarFutureHigh (ImageServer) | API Reference |
| JSON | SOAP |
Virginia Coastal Resilience Master Plan (CRMP) Graduated Rainfall-Driven Flood Extents for the Far Future High planning scenario.
Rainfall-driven flooding (also known as pluvial flooding) occurs when intense or prolonged rainfall exceeds the land’s ability to drain or absorb water, leading to inundation of normally dry lands. Rainfall-driven flood models can indicate areas prone to rainfall-driven flooding that are not always reflected in regulatory flood maps. This dataset depicts the extent of potential rainfall-driven flooding under various flood conditions. 10-foot resolution raster data is classified and colored to represent the extent of the most frequent (least-rare) floods that may impact a given area. The included flood conditions represent a range of rainfall amounts derived from statistical analysis of historic events. The rainfall amounts and their resultant flooding extents are described in terms of their relative annual exceedance probability (AEP), which represents the percentage chance that a given flood magnitude will occur in a given year. The specific flood conditions included are: 50% AEP, 20% AEP, 10% AEP, 4% AEP, 2% AEP, 1% AEP, and 0.2% AEP.
In the CRMP, planning scenarios are defined by their time horizon and projection range, representing future conditions and the uncertainty inherent in climate forecasts that project them. This dataset contains information for the Far Future time horizon, meaning it is suitable for planning through the next 75 years and is based on climate data most relevant to the period between 2060 and 2100. Within this time horizon, this dataset shows a High climate change projection, indicating a less likely but possible future with higher sea level rise and precipitation estimates, which may be favored for use in decisions with little tolerance for risk.
The CRMP’s rainfall-driven flood modeling considered future precipitation projections based on the Mid-Atlantic Regional Integrated Sciences and Assessments (MARISA) predictive intensity, duration, and frequency curves for Virginia. Complete documentation of the source data and production process is provided in the Pluvial Modeling Final Report (Dewberry 2024, Addendum A).
Raster values are classified as follows: 40 = 50% AEP, 50 = 40% AEP, 60 = 10% AEP, 70 = 4% AEP, 80 = 2% AEP, 90 = 1% AEP, 100 = 0.2% AEP, 0/Null = None.
Related resources include the VA CRMP Master Plan report (https://www.dcr.virginia.gov/crmp/) and Coastal Resilience Web Explorer (https://www.dcr.virginia.gov/crmp/cr-web-explorer).
For questions or additional information, please contact Flood.Resilience@dcr.virginia.gov.
Virginia Coastal Resilience Master Plan (CRMP) Graduated Rainfall-Driven Flood Extents for the Far Future High planning scenario.
Rainfall-driven flooding (also known as pluvial flooding) occurs when intense or prolonged rainfall exceeds the land’s ability to drain or absorb water, leading to inundation of normally dry lands. Rainfall-driven flood models can indicate areas prone to rainfall-driven flooding that are not always reflected in regulatory flood maps. This dataset depicts the extent of potential rainfall-driven flooding under various flood conditions. 10-foot resolution raster data is classified and colored to represent the extent of the most frequent (least-rare) floods that may impact a given area. The included flood conditions represent a range of rainfall amounts derived from statistical analysis of historic events. The rainfall amounts and their resultant flooding extents are described in terms of their relative annual exceedance probability (AEP), which represents the percentage chance that a given flood magnitude will occur in a given year. The specific flood conditions included are: 50% AEP, 20% AEP, 10% AEP, 4% AEP, 2% AEP, 1% AEP, and 0.2% AEP.
In the CRMP, planning scenarios are defined by their time horizon and projection range, representing future conditions and the uncertainty inherent in climate forecasts that project them. This dataset contains information for the Far Future time horizon, meaning it is suitable for planning through the next 75 years and is based on climate data most relevant to the period between 2060 and 2100. Within this time horizon, this dataset shows a High climate change projection, indicating a less likely but possible future with higher sea level rise and precipitation estimates, which may be favored for use in decisions with little tolerance for risk.
The CRMP’s rainfall-driven flood modeling considered future precipitation projections based on the Mid-Atlantic Regional Integrated Sciences and Assessments (MARISA) predictive intensity, duration, and frequency curves for Virginia. Complete documentation of the source data and production process is provided in the Pluvial Modeling Final Report (Dewberry 2024, Addendum A).
Raster values are classified as follows: 40 = 50% AEP, 50 = 40% AEP, 60 = 10% AEP, 70 = 4% AEP, 80 = 2% AEP, 90 = 1% AEP, 100 = 0.2% AEP, 0/Null = None.
Related resources include the VA CRMP Master Plan report (https://www.dcr.virginia.gov/crmp/) and Coastal Resilience Web Explorer (https://www.dcr.virginia.gov/crmp/cr-web-explorer).
For questions or additional information, please contact Flood.Resilience@dcr.virginia.gov.