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Fluvial Erosion Hazards in New Hampshire Shane Csiki Fluvial Geomorphology Specialist New Hampshire Geological Survey New Hampshire Department of Environmental Services 2012 USACE Flood Risk Management and Silver Jackets Workshop Harrisburg, PA August 23, 2012
Piscataquog River Watershed • Major flood events in New • Hampshire (2005-2007) • $75.6 million total inundation • and erosion damage • Heavy rains and repetitive rains • New Hampshire’s highest recurring natural hazard risk
2005 NHDOT Imagery 2009 NAIP Imagery
PIRRTPost Irene River Response Team • Established in mid-October 2011 (convened by NH-HSEM) • Due to widespread distribution and magnitude of the damage • Need to better coordinate state and federal response • Provide Governor, Legislators and other leaders with succinct information regarding damage and response • Met regularly Octoberthrough May
Who is PIRRT? State of New Hampshire Federal
PIRRT • Accomplishments: • Developed GIS coverage of impacted areas for coordination with permit applications • Eliminated agency duplication of effort • Provided better customer service to communities and individuals • Centralized web-based project management system • Catalog all work done by participating agencies • Catalog the costs for mitigation and restoration • Useful for future events through inventory building
Post Incident River Response TeamNew Hampshire Silver Jackets • Established and ready to be activated after a major flood damaging event • Maintaining existing agency membership • Long term perspective - Assess watershed and river processes to prep for future flood hazards - Allow an improved communication effort among all involved