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As part of pluvial development for CRMP Phase II, a total of 1830 pluvial models were produced across the 16,600 square miles and 57 counties within the CRMP study area.
The scenario-based products are derivatives of the rainfall interval-based products. Phase II of the CRMP has adopted a planning framework encompassing five scenarios, including present (current conditions) and near-future and far-future time horizons with moderate and high projections.
Moderate projections represent a “best estimate” for future conditions, while High projections indicate 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.
For each scenario, cross-referencing related the rainfall intervals to 2-, 5-, 10-, 25-, 50-, 100-, and 500-year recurrence intervals. The most-frequent (least-rare) event that floods the location per given time horizon is mapped.
For more information see CRMP II Appendix A Flood Hazard Data Development at https://www.dcr.virginia.gov/crmp/plan-phase2
and the Pluvial Modeling Technical Memorandum:
https://vadcr-frp.s3.amazonaws.com/Pluvial_CRMP/VACRMP_PluvialModelingReport_Final_20240614.pdf
As part of pluvial development for CRMP Phase II, a total of 1830 pluvial models were produced across the 16,600 square miles and 57 counties within the CRMP study area.
The scenario-based products are derivatives of the rainfall interval-based products. Phase II of the CRMP has adopted a planning framework encompassing five scenarios, including present (current conditions) and near-future and far-future time horizons with moderate and high projections.
Moderate projections represent a “best estimate” for future conditions, while High projections indicate 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.
For each scenario, cross-referencing related the rainfall intervals to 2-, 5-, 10-, 25-, 50-, 100-, and 500-year recurrence intervals. The most-frequent (least-rare) event that floods the location per given time horizon is mapped.
For more information see CRMP II Appendix A Flood Hazard Data Development at https://www.dcr.virginia.gov/crmp/plan-phase2
and the Pluvial Modeling Technical Memorandum:
https://vadcr-frp.s3.amazonaws.com/Pluvial_CRMP/VACRMP_PluvialModelingReport_Final_20240614.pdf