Narragansett Bay Map Matrix

The matrices below shows mapped visualizations of predicted flooding from surge for observed climate conditions (1980-1999) and future scenarios in the periods 2020-2029, 2050-2059, and 2080-2099. For each of these time periods, probabilistic flooding is shown for the 1-year, 100-year, 500-year and 2500-year storm events. These storm events respectively correspond to a 100, 40, 10 and 2 percent probability of exceedance in a fifty-year time period. Surge risk analyses were statistically derived from synthetic storms by the SCR science and engineering team at Princeton University, led by Ning Lin. The flood levels shown include surge, tide, and sea level rise distributions, statistically combined.

The Narragansett Bay design strategy protects the coast through managed plantings, floodplains, elevated berms and constructed dunes. Key objectives include protecting transportation routes and hydrologic infrastructure from storm surge flooding, coastal erosion, and salt marsh loss. The bay wide strategy is structured around three main design focus areas: Sachuest, Hummocks, and Warren.  Each area features a unique protection objective and corresponding design strategy that is replicated throughout the bay.

EXISTING CLIMATE
PROJECTED CLIMATE

1980 - 1999

2020 - 2029

2050 - 2059

2080 - 2099

Hummocks Map Matrix

The Hummocks, also known as Island Park Cove, is a non-sewered former fishing village with a population of 1,250 and an area of 560 acres. Route 138, a critical infrastructure and evacuation route for the entirety of Aquidneck Island, splits the Hummocks in a North-South direction. The proposed topography includes a berm at a 15’ elevation and additional fill deposited into the inter-tidal zone to allow for salt marsh migration. The berm and salt marsh extension are sited to the south of Route 138.

EXISTING CLIMATE
PROJECTED CLIMATE

1980 - 1999

2020 - 2029

2050 - 2059

2080 - 2099

Newport Map Matrix

Newport is seaside city on Aquidneck Island with a population of 24,672 (2010 census). To the south and east are the city’s major fresh water ponds and reservoirs. The proposed strategy will relocate these reservoirs upland and replace them with 15’ berms and managed coastal forests, increasing the upland elevation and protecting the town from fresh water loss and flooding. Additional infrastructure protection is added in Potter’s Cove, where a double-sided 15’ berm protects Route 138, a major evacuation route out of the city.

EXISTING CLIMATE
PROJECTED CLIMATE

1980 - 1999

2020 - 2029

2050 - 2059

2080 - 2099