Dukes County Structures Hazard Impact Analysis

Using the roofprint data from MassGIS as of June 2020, the MVC converted those roofprints to centroids. Only structures having a roofprint area >400sq ft were included in the analysis. This was done to eliminate presumed sheds, garages, and small barns, from the analysis. The structure points were analyzed against the natural hazard spatial coverages to identify those structures that are at risk. The 5 hazards are Wildfire, FEMA Flood, Sea Level Rise, Tsunami, and Hurricane. For those hazards with varying levels of impact, the specific level is noted in the attribute table. Hazard Data Sources: Wildfire Risk Area -- MVC 2020; Process: Any pitch pine and scrub/shrub oak habitats were extracted from their larger dataset (TNC 2002). The other 2 files are extracts from the MassGIS Land Use/Land Cover data of 2016. From that dataset I took Land Cover Class 9 (deciduous) & Class 10 (Evergreen) where General Use was any of the following: 2, 6, 7, 8, 9, OR Detailed Use was 39*, 13*, 44*. Lands fitting that criteria definition were dissolved together but only where contiguous. Then, any areas within that which were 50 acres or more were retained. Lastly, that file was buffered 1000ft. So, any structures within the a) pitch pine/scrub oak habitat; OR b) contiguous woodland; OR c) within 100ft of contiguous woodland are considered within the ‘Wild & Urban Land Interface’ (or within an area which is at risk of being negatively impacted by wildfire). Those 4 datalayers were dissolved together into this spatial extent. Tsunami-- MVC 2020; Area is 1 mile from the MassDEP/MassGIS 1:25,000 hydrology coastline FEMA Flood -- FEMA Effective 2016 Hurricane- SLOSH model by NOAA/USACE 2013 Sea Level Rise - Flood Risk Model -MassDOT/Woods Hole Group/UMass Boston 2020 -- Flood Risk Model with flooding probability for 'present' timestamp (represents year 2013), and forecasts for 2030, 2050, and 2070. Similar timestamp forecasts for modeled flooding depth during 100year storm event.