| 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’s major flood hazard sources and should be used to inform local and regional flood resilience planning and decision-making. |
| 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’s major flood hazard sources and should be used to inform local and regional flood resilience planning and decision-making. |
| 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. |
| thumbnail:
|
|
| maxScale:
|
5000.0 |
| typeKeywords:
|
["ArcGIS Server","Data","Image Service","Service"] |
| description:
|
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Virginia Coastal Resilience Master Plan (CRMP) Graduated Rainfall-Driven Flood Extents for the Baseline planning scenario. </SPAN></P><P><SPAN>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. </SPAN></P><P><SPAN>This dataset contains information for the baseline planning scenario, meaning it is based on historical, observed data and does not incorporate anticipated future conditions. This data is suitable for understanding current conditions (2020) and can serve as a basis for comparison with future conditions.</SPAN></P><P><SPAN>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).</SPAN></P><P><SPAN>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><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> |
| licenseInfo:
|
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The analysis is based on the best available models and datasets when the data were created. </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> |
| catalogPath:
|
|
| title:
|
Rainfall-Driven Flood Extents, Baseline Scenario |
| type:
|
Image Service |
| url:
|
https://floodmaps.dcr.virginia.gov/arcgis |
| tags:
|
["Flooding","Flood Hazard","Coastal Resilience","Virginia","DCR","CRMP","Rainfall","Pluvial","Graduated Floodplain","Precipitation","Baseline","Present"] |
| culture:
|
en-US |
| portalUrl:
|
|
| name:
|
Rainfall_Baseline |
| guid:
|
|
| minScale:
|
1.5E8 |
| spatialReference:
|
WGS_1984_Web_Mercator_Auxiliary_Sphere |