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Tuesday, May 14 • 1:45pm - 2:15pm
PRESENTATION: ArcGIS for MS4 Stormwater Mapping: NHDOT Approach

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AUTHORS: Stephanie Pelletier, VHB & Dale Abbott* GISP – VHB

ABSTRACT: The Environmental Protection Agency released a new MS4 Stormwater General Permit for New Hampshire that became effective on July 1, 2018. The General Permit requires the DOT to develop updated maps of their stormwater system and related outfalls.  A key new requirement includes linking stormwater outfalls with the water quality impairments listed on the State?s 303 (d) list (impaired waters). VHB has been assisting the NH Department of Transportation in meeting the MS4 General Permit requirements. Specifically, VHB has developed a geodatabase of all NHDOT Operated outfalls with the NH MS4 area. In addition to compiling the geodatabase, VHB is leveraging Collector for ArcGIS to support field investigations, performing spatial analysis in ArcPro to estimate roadway drainage and combine outfalls with impaired waters data. Additionally, VHB is utilizing Operations Dashboard to track outfall inspections and business intelligence on various outfalls statistics such as receiving waters and water quality impairment.                          

Tuesday May 14, 2019 1:45pm - 2:15pm EDT