The FIRST Score® provides the total number of tidal, non-storm flood days the site is projected to experience over the next 30 years. A flood day is defined as days when the measured water level, enhanced by sea level rise, is greater than a threshold elevation of the site. As represented below, the FIRST Score® projects out to 30 years (from 2015 to 2045) and is displayed using a table divided into five-year increments demonstrating the progression of risk over time.
Coastal Risk Rapid Assessment™
Coastal Risk’s Coastal Risk Rapid Assessment™ (CRRA™) is a proprietary online flood risk vulnerability assessment downscaled to the parcel level, with the option for customization. The CRRA™ focuses on the spatial extent of non-storm or nuisance flooding which is related to factors such as sea level rise, tidal forcing, groundwater depth, and local subsidence. In addition to WHERE on the property it will flood, the CRRA™ projects WHEN (how many days per year) and HOW DEEP the water will be. The assessment consists of multiple maps that identify where flooding is projected to occur on the site.
The full CRRA™ includes the following components:
(1) Flood Risk Zones
(2) Flood Inundation Risk Score and Table™ (FIRST Score™)
(3) Parcel-Specific SLOSH model
(4) Airborne LiDAR High Resolution Elevation Map.
The CRRA™ models current and future flood risks due to tidal, storm and groundwater flooding, as compounded by local sea-level rise (SLR) rates through the year 2045.
Parcel-Specific Slosh Model
The CRRA™ map showing nuisance flooding with the option of including storm surge risk for the site is portrayed by Coastal Risk’s Parcel-Specific SLOSH Model. The model is an application of the Seas Lakes and Overland Surges from Hurricanes (SLOSH) model developed by NOAA. The model uses maximum storm surge from a Category 3 hurricane layered with tidal cycles and sea level rise.
Flood Risk Zones
The ‘Flood Risk Zones’ comprise an account of the climate-related, government-designated risk zones in which the site currently lies. The risk zones include: FEMA flood zones, wind zones, evacuation zones, Community Rating Score, Special Flood Hazard Areas, and the Coastal Construction Control Line or other state setback, where applicable.
Airborne LiDAR High Resolution Elevation
The Airborne LiDAR High Resolution Elevation Map conveys detailed elevation information for the site. This map provides the client with a visualization of the location of low-lying areas and helps give context to the results of the CRRA™, FIRST and SLOSH models, assisting with evaluation, prioritization, and decision-making.