{ "culture": "en-US", "name": "Rainfall_NearFutureMod", "guid": "", "catalogPath": "", "snippet": "This data was created to support Phase II of the Virginia CRMP. The CRMP and its products are designed to be a trusted resource to assist government entities in making evidence-based decisions using high-quality flood resilience data. CRMP hazard data represents the best available information related to coastal Virginia\u2019s major flood hazard sources and should be used to inform local and regional flood resilience planning and decision-making. ", "description": "

Virginia Coastal Resilience Master Plan (CRMP) Graduated Rainfall-Driven Flood Extents for the Near Future Moderate planning scenario. <\/SPAN><\/P>

Rainfall-driven flooding (also known as pluvial flooding) occurs when intense or prolonged rainfall exceeds the land\u2019s 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. <\/SPAN><\/P>

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 Near Future time horizon, meaning it is suitable for planning through the next 35 years and is based on climate data most relevant to the period between 2030 and 2060. Within this time horizon, this dataset shows a Moderate climate change projection, indicating a \u201cbest estimate\u201d for future conditions, suitable for decisions where a higher level of risk is acceptable.<\/SPAN><\/P>

The CRMP\u2019s 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).<\/SPAN><\/P>

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.<\/SPAN><\/P>

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). <\/SPAN><\/P>

For questions or additional information, please contact Flood.Resilience@dcr.virginia.gov.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "summary": "This data was created to support Phase II of the Virginia CRMP. The CRMP and its products are designed to be a trusted resource to assist government entities in making evidence-based decisions using high-quality flood resilience data. CRMP hazard data represents the best available information related to coastal Virginia\u2019s major flood hazard sources and should be used to inform local and regional flood resilience planning and decision-making. ", "title": "Rainfall-Driven Flood Extents, Near Future Moderate Scenario", "tags": [ "Flooding", "Flood Hazard", "Coastal Resilience", "Virginia", "DCR", "CRMP", "Climate Change", "Future Conditions", "Rainfall", "Pluvial", "Graduated Floodplain", "Precipitation", "Near Future Moderate" ], "type": "Image Service", "typeKeywords": [ "ArcGIS Server", "Data", "Image Service", "Service" ], "thumbnail": "", "url": "https://floodmaps.dcr.virginia.gov/arcgis", "minScale": 1.5E8, "maxScale": 5000.0, "spatialReference": "WGS_1984_Web_Mercator_Auxiliary_Sphere", "accessInformation": "This dataset was created by the Virginia Department of Conservation and Recreation (DCR) in 2024. DCR will review and make appropriate adjustments to this data with each update of the CRMP.", "licenseInfo": "

The analysis is based on the best available models, datasets, and future condition projections when the data were created. <\/SPAN><\/P>

With all models and forward-looking data, uncertainty and constraints exist. Future conditions data reflect possible scenarios that can be used to inform an understanding of potential flood risk, which can be incorporated into decision-making alongside other relevant factors.<\/SPAN><\/P>

Flood hazard models are simplified representations of complex and interconnected natural and manmade systems. Users should note that the following factors are not included in the flood hazard models: stormwater infrastructure, narrow floodwalls, compound flooding, erosion, and groundwater levels.<\/SPAN><\/P><\/DIV><\/DIV>", "portalUrl": "" }