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Sea Level Impact Projection (SLIP) Study Report
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| Coordinates |
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| Project category |
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| Construction type |
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| Risk category |
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| Construction start year |
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| Expected life (years) |
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| Estimated Construction Cost ($) |
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| Critical elevation (ft NAVD88) |
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| Organization |
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| Report Date |
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Results
N/A
| Metric |
Value |
| FEMA Flood Hazard Zone |
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| Base Flood Elevation (ft ) |
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| Terrain Elevation (ft NAVD88) |
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| Int-High Sea Level Rise (year ) (ft NAVD88) |
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| Wind Zone (mph) |
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Average Annual Chance of Substantial Flood Damage (AACSFD) is calculated using NOAA sea level projections, FEMA coastal storm surge events, and associated wave heights. This flood risk probability does not include high-tide flooding, precipitation (stormwater), or riverine flooding.
* Average Annual Chance of Substantial Flood Damage (AACSFD) value of N/A does not imply that the project is not at risk of flooding. N/A means that AACSFD is unable to be automatically calculated due to missing data required by the SLIP Tool and needs further analysis. The metrics presented in the SLIP Report can be used to assess the project’s flood risk, such as comparing the project’s critical elevation to the Terrain, Base Flood Elevation, and NOAA Intermediate-High SLR scenario. This information can be found in the top two sections of this report.
Potential Beneficial Adaptation Strategies
Based on the results of the SLIP Study, the following adaptation strategies may be beneficial to consider in the construction design. These are not recommendations, merely standard strategies used to mitigate risk.
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Flood Barriers (Passive or Active)
Flood barriers are used around a building or its utility components to protect from flooding. Flood barriers can be categorized as either passive or active devices. Passive flood barriers operate automatically during a flood or storm event and do not require any human intervention or power source. An example of a passive flood barrier is a floodwall or levee. Active flood barriers require warnings in advance to deploy during a flood or storm event. This strategy is of limited value when flash floods are frequent. FEMA recommends passive flood barrier devices when planning and building. Resources: FEMA - Floodwall with Passive Floodgates Signals Commitment
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| Solution Timeline | Intermediate |
| Scale | Micro |
| Adaptation Infrastructure | Gray |
| Degree of Protection | Medium |
| Relative Cost ($, $$, $$$) | $$ |
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Flood Damage-Resistant Materials
Flood damage-resistant materials such as non-paper-faced gypsum board and terrazzo tile flooring for building materials and furnishings located below the base flood elevation help to reduce structural and nonstructural damage and post-flood event cleanup. The useful life of flood damage-resistant materials ranges between 10 and 20 years with annual maintenance costs depending on the type of material.
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| Solution Timeline | Intermediate |
| Scale | Micro |
| Adaptation Infrastructure | Gray |
| Degree of Protection | Medium |
| Relative Cost ($, $$, $$$) | $$ |
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Foundation Flood Vents
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| Solution Timeline | Intermediate |
| Scale | Micro |
| Adaptation Infrastructure | Gray |
| Degree of Protection | Low |
| Relative Cost ($, $$, $$$) | $$ |
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Increase Plantings
Using groundcover and shrubbery has many benefits compared to unplanted and paved surfaces. The velocity of floodwaters is reduced, which in turn can reduce damage from floating debris. Infiltration and uptake of floodwaters are improved and accelerated by plants, which resolves the flood event sooner and more effectively than bare ground. And, erosion occurring as flooding recedes is reduced when the soil is held in place by plant roots. Projects: R1804 - Fruit Farm Creek Mangrove Restoration Project
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| Solution Timeline | Long Term |
| Scale | Macro |
| Adaptation Infrastructure | Green |
| Degree of Protection | Low |
| Relative Cost ($, $$, $$$) | $ |
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Potential Public Safety and Environmental Impacts
Based on the results of the SLIP Study, consider the following potential public safety and environmental impacts:
Flood Risk
When factoring in the flood zone, base flood elevation, terrain, and sea level rise trends for the project location, a moderate flood risk is present.
Wind Risk
The project location was found to be located in an area of wind risk with a maximum wind speed of mph. There is potential risk from flying debris.
Explosion Risk
The high wind risk in this project location may contribute to a higher risk of explosion due to potential downed powerlines.
FEMA Flood Hazard Information
| Flood Zone |
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| Zone subtype |
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| Static BFE (ft ) |
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| Vertical Datum |
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The base flood elevation (BFE) is provided in for VE, AE, and AH special flood hazard zones.
Regional Sea Level Rise Scenarios
NOAA Regional Scenarios (ft NAVD88)
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2060 |
2080 |
2100 |
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| Intermediate Low |
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| Intermediate |
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| Intermediate High |
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| High |
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| Extreme |
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The five relative sea level rise (RSL) scenarios shown in this report are derived from NOAA Technical Report NOS CO-OPS 083 “Global and regional sea level rise scenarios for the United States” using the same methods as the USACE Sea Level Rise Calculator. These new scenarios were developed by the Sea Level Rise and Coastal Flood Hazard Scenarios and Tools Interagency Task Force, jointly convened by the U.S. Global Change Research Program (USGCRP) and the National Ocean Council as input to the USGCRP Sustained Assessment process and 4th National Climate Assessment. These RSL scenarios provide a revision to the (Parris et. al, 2012) global scenarios which were developed as input to the 3rd National Climate Assessment.
These RSL scenarios begin in year 2020 and take into account global mean sea level rise (GMSL), regional changes in ocean circulation, changes in Earth’s gravity field due to ice melt redistribution, and local vertical land motion.
NOAA High Tide Flooding Information
Annual occurrences of tidal flooding—exceeding local thresholds for minor impacts to infrastructure—have increased 5- to 10-fold since the 1960s in several U.S. coastal cities. The changes in high tide flooding over time are greatest where elevation is lower, local RSL rise is higher, or extreme variability is less.
In a sense, today’s flood will become tomorrow’s high tide, as sea level rise will cause flooding to occur more frequently and last for longer durations of time.
Wind Zones
| Metric |
Value |
| Maximum Wind Speed |
mph |
Terrain
| Metric |
Value |
| Elevation (ft) |
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| Vertical Datum |
NAVD 88 |
This terrain elevation is derived from the latest compilation of terrain data from NOAA. This dataset contains the best publicly available terrain data in a 3m resolution.
Design Alternatives
The selection of a construction project location involves a considerable number of factors, including but not limited to regulatory issues, engineering, and logical decisions. The SLIP Study Tool may be run multiple times with different project locations and critical elevations, to achieve a desired result. Please use the SLIP Map along with the Coastal Hazard layers to assist you in selecting the optimal location. Review this report and assess the risks which may be mitigated by changing the design parameters, then run the SLIP Study Tool again.