{ "currentVersion": 10.91, "cimVersion": "2.9.0", "id": 9, "name": "MD.DBO.Kent_Florence_HazardVulnerabilityIndex", "type": "Feature Layer", "parentLayer": null, "defaultVisibility": true, "minScale": 0, "maxScale": 0, "canScaleSymbols": false, "geometryType": "esriGeometryPolyline", "description": "In light of the significant damage in the state of North Carolina caused by the storm surge from Hurricane Florence on September 14, 2018, concerns about the vulnerability of the coastal communities on the Atlantic coast of Maryland and in Maryland\u2019s portion of the Chesapeake Bay have come into focus. This project seeks to replicate the storm surge heights seen with Hurricane Florence, to determine a what-if scenario in coastal Maryland.METHODOLOGYInland County Analysis:USGS Station Observations provide the flood statistic: 10.41ft.Stations evaluated:USGS 02092576 TRENT RIVER AT US HIGHWAY 70 AT NEW BERN, NCUSGS 0209270825 BOGUE SOUND AT SR 1182 AT ATLANTIC BEACH, NCUSGS 02092712 BOGUE SOUND AT NC HIGHWAY 58 AT EMERALD ISLE, NCUSGS 0209303201 NEW RIVER AT OLD BRIDGE STREET AT JACKSONVILLE, NCUSGS 02093206 INTRACOASTAL WTRWY AT NC HWY50/210 AT SURF CITY,NCUSGS 02093222 BANKS CHANNEL AT US HWY 74 WRIGHTSVILLE BEACH, NCUSGS 0210869230 NE CAPE FEAR R AT US HWY 74/133 AT WILMINGTON, NCStation collection process (based on Lat-Long box):https://www.weather.gov/lmrfc/climate_riverdataSelect link: \u201cUS Geological Survey archived data\u201dClick North Carolina for all NC stationsUnder Statewide Streamflow Table, select \u201cBuild Time Series\u201dUnder Choose Site Selection Criteria-Site Location, select \u201cLat-Long box\u201d, submitBounding box:Nags head (NE) 35.9206021,-75.6865208NW 35.9206021,-78.9488473SE 33.7198685, -75.6865208Myrtle Beach (SW) 33.7198685,-78.9488473Coordinates in decimal degreesSelect single parameter : \u201cEstuary or ocean water surface elevation above NAVD 1988, ft\u201dData range: 9/11/18-9/18/18For max value, select output as tableUsing station numberOn station\u2019s home page, under \u201cavailable data for this site\u201d, select location map to extract lat-long and time-series data as needed Data from the USGS river archives downloaded asa.gz. To access data in Excel save .gz as a Word Document, then copy the values over to an Excel Workbook. Each Workbook and Word Document is saved for reference. HAZUS-MH 4.2 [ArcGIS for Desktop 10.5.1] software used to simulate flood scenario. Base elevation data reprojected to WGS84 UTM 18N. Base elevations upsampled to DEM with 2m cell resolution. The flood solution is a depth grid representing stillwater elevations (vertical units: ft).LiDAR collections used in base elevation DEMs are best available at time of project launch (2015).Road Segment AnalysisDepth GRID reclassified using 0.5 foot ranges as [gridcode]:0 = less than or equal to one-tenth of a foot (<= 0.10')1 = greater than one-tenth foot and less than or equal to a half foot (> 0.10' and <= 0.5')2 = greater than a half foot and less than or equal to on foot (> 0.5' and <= 1')3 = greater than one foot and less than or equal to two foot (> 1' and <= 2')4 = greater than two foot (> 2')Hazard Vulnerability Index (HVI) calculated in overlay analysis using roadway characterisitics as [risk]:RISK = (Evacuation Route * 0.5 + 1.0) * ((classified stillwater elevation + .01) / 4.0) * (1.0 / Functional Class) * 0.70HVI classified using Natural Breaks as [HVI_Class]:1 = RISK <= 0.0032 = RISK > 0.003 and RISK <= 0.153 = RISK > 0.15 and RISK <= 0.2644 = RISK > 0.264REPROJECTION:Manual reprojection of county DEMs to common spatial reference, per HAZUS-MH standard - WGS84 UTM 18N - EPSG 32618Applied transformations:Anne Arundel - WGS_1984_(ITRF00)_To_NAD_1983Baltimore - WGS_1984_(ITRF00)_To_NAD_1983Baltimore City - WGS_1984_(ITRF00)_To_NAD_1983Calvert - WGS_1984_(ITRF00)_To_NAD_1983Caroline - WGS_1984_(ITRF00)_To_NAD_1983Cecil - WGS_1984_(ITRF00)_To_NAD_1983Charles - WGS_1984_(ITRF00)_To_NAD_1983Dorchester - WGS_1984_(ITRF00)_To_NAD_1983Harford - WGS_1984_(ITRF00)_To_NAD_1983Kent - WGS_1984_(ITRF08)_To_NAD_1983_2011Queen Anne\u2019s - WGS_1984_(ITRF00)_To_NAD_1983Somerset - NAS_1983_NSRS_2007_To_NAD_1983_2011 + WGS_1984_(ITRF08)_To_NAD_1983_2011St. Mary\u2019s - WGS_1984_(ITRF00)_To_NAD_1983Talbot - WGS_1984_(ITRF08)_To_NAD_1983_2011Wicomico - NAS_1983_NSRS_2007_To_NAD_1983_2011 + WGS_1984_(ITRF08)_To_NAD_1983_2011Worcester - NAS_1983_NSRS_2007_To_NAD_1983_2011 + WGS_1984_(ITRF08)_To_NAD_1983_2011Additional Hurricane Florence 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