Flood Hazard Analysis
Use this data to analyze the potential impacts of flooding events on Lifeline Sectors identified by the US Department of Homeland Security. Datasets include latitude and longitude coordinates to support mapping.
This tool was developed in collaboration with the New Jersey State Office of Emergency Management (OEM). It is intended to provide municipal and county hazard planners with easy access to data and other resources that can assist with development of Hazard Mitigation Plans consistent with guidance issued by the Federal Emergency Management Agency (FEMA). Additionally, this tool is designed to help state and local end users assess impacts of flooding on key lifeline sectors, socially vulnerable populations, and individual land parcels. It also includes data on heat hazards to assist end users with understanding impacts of heatwaves and urban heat island. Currently, this tool includes datasets on the following topics:
Spatial Datasets Available Here: https://arcg.is/1zLm4O
Flood Hazard Analysis
Use the Heatwave Analysis to view annual statistics of historical (1981–2010) and projected future (2036–2065, 2070–2099) incidences of heatwaves by county.
Use the Heat Island/Overburdened Communities Analysis to assess intersections of potential heat islands and vulnerable populations by Census Block Group. The dataset provides impervious cover and canopy cover prevalence that could indicate potential heat island effects joined with the NJDEP's Environmental Justice - Overburdened Community data. Includes Census Block Group identifiers for joining with associated spatial datasets.
The Social vulnerability Index provides specific socially and spatially relevant information to help public health officials and local planners better prepare communities to respond to emergency events such as severe weather, floods, disease outbreaks, or chemical exposure.
This dataset provides potential flood analysis for each tax parcel in New Jersey. The analysis was performed using the Parcels and MOD-IV Composite of NJ (Link) and intersecting it with 1-20ft of Total Water Levels (see the Total Water Levels Tool on NJFloodmapper for more information) and the FEMA Flood Zones for the 1% Flood Event, 0.5% Flood Event, Regulatory Floodway, and Areas of Undetermined Flood Hazard.
This Appendix provides additional background on sea-level rise and the Total Water Level approach for assessing vulnerability of people, places, and assets in New Jersey to sea-level rise and sea-level rise combined with storm events.
Sea level Rise and Total Water Level: From 1911 to 2019, the mean sea-level rose 1.5 feet along the New Jersey coast, compared to a 0.6 feet rise in the global mean sea-level. New Jersey coastal areas are likely to experience sea-level rise of 0.5 to 1.1 feet between 2000 and 2030, and 0.9 to 2.1 feet between 2000 and 2050.
Figure A-1. Total Water Level reflecting combined inundation from future sea-level rise and flood events.
The number of days that New Jersey residents have experienced high-tide floods has also increased. From 2007 through 2016, there was an average of 8 high-tide flood events in Atlantic City each year. Based on the likely range of sea-level rise projections, Atlantic City will experience 17-75 days of expected high-tide flooding per year in 2030, and 45-255 days per year of expected high-tide flooding in 2050.
For the purposes of the exposure snapshots, different flood events are defined by total water levels (TWLs). TWLs present a height above high tide (See Figure A-1) that reflects the combined inundation from future sea-level rise and current flood events projected into the future from the year 2000 (Kopp et al., 2019).
Flood events1 can occur from surge created by a coastal storm (such as a hurricane or nor’easter) or from high tide each day as sea levels rise. For example, a 2-foot flood event along the New Jersey coast today can occur because of seasonal ‘high-tide flood’ conditions. By 2050, the same 2-foot flood events will become more frequent, occurring under normal high-tide conditions and inundating the affected areas2. While flood events resulting from daily tides will result in permanent inundation (i.e., the water will not recede), coastal storm induced flood events last only for the duration of a storm. A 7-foot flood event along the New Jersey coast that approximates potential hurricane storm tides today will become more likely in the future as coastal storm surge occurs on top of an increased baseline of sea-level to create higher storm tides. You can use our tools at (NJADAPT / NJFLOODMAPPER) to develop custom water levels for your region.
1Flood events referenced in this document as examples reflect ‘total water level’ heights above Year 2000 Mean Higher High Water, consistent with the sea-level baseline datum. See Kopp et al., 2019.
2See Kopp et al., 2019 Appendix B for region specific high-tide flood frequency projections.
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