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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’s major flood hazard sources and should be used to inform local and regional flood resilience planning and decision-making. |
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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’s major flood hazard sources and should be used to inform local and regional flood resilience planning and decision-making. |
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This dataset was created by the Virginia Department of Conservation and Recreation (DCR) in 2025. DCR will review and make appropriate adjustments to this data with each update of the CRMP. |
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5000.0 |
| typeKeywords:
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["ArcGIS Server","Data","Image Service","Service"] |
| description:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Virginia Coastal Resilience Master Plan (CRMP) Combined Flood Hazard Flood Presence for 1% Annual Exceedance Probability (AEP) event in the Near Future High planning scenario.</SPAN></P><P><SPAN>This dataset depicts the geographic area likely to be inundated by a major (1% AEP) flood event resulting from any of the three independent flood sources: coastal, rainfall-driven, and riverine. Areas within this 1% AEP extent have a 1-in-100 chance, or greater, of experiencing flooding in any given year, based on statistical analysis and modeling of historical events. The raster data has a 10-foot resolution scale. </SPAN></P><P><SPAN>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 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.</SPAN></P><P><SPAN>This combined flood hazard information draws leverages data from multiple sources, including CRMP 2022 coastal flood modeling, 2024 rainfall-driven flood modeling, and riverine flood data from the Federal Emergency Management Agency (FEMA). Complete documentation of the source data and production process for coastal flooding can be found in the VA CRMP Phase I Appendix C – Coastal Flood Hazard Framework Report (Dewberry, 2022). For rainfall-driven flooding, the documentation is provided in the Pluvial Modeling Final Report (Dewberry, 2024, Addendum A).</SPAN></P><P><SPAN>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><P><SPAN>For questions or additional information, please contact Flood.Resilience@dcr.virginia.gov.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The analysis is based on the best available models, datasets, and future condition projections when the data were created. </SPAN></P><P><SPAN>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. Future conditions for the riverine flood hazard was not included and so baseline (2020) information is referenced.</SPAN></P><P><SPAN>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></DIV> |
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| title:
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Combined Flood Hazard 1% AEP Extent, Near Future High Scenario |
| type:
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Image Service |
| url:
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https://floodmaps.dcr.virginia.gov/arcgis |
| tags:
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["Flooding","Flood Hazard","Coastal Resilience","Virginia","DCR","CRMP","Climate Change","Future Conditions","Combined Hazard","Flood Hazard Extent","1% AEP","Near Future High"] |
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en-US |
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| name:
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Combined_Extent_NearFutureHigh |
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| minScale:
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1.5E8 |
| spatialReference:
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NAD_1983_StatePlane_Virginia_South_FIPS_4502_Feet |