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Suncook River Sediment Study and Flood Mapping

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Suncook River Sediment Study and Flood Mapping USGS Flood Inundation Mapping of the Suncook River in Chichester, Epsom, Pembroke and Allenstown, New Hampshire NH Water & Watershed Conference Robert Flynn, USGS NH-VT Water Science Center March 23, 2012 Suncook River Study Discussion Points Recent history of Suncook River flooding Flood mapping and Sediment studies Suncook River flood inundation study Suncook River Study Area May 2006 Flood Flooding resulted from sustained rainfall event of up to 14 inches of rain in coastal areas, 11 inches in central NH Preceded by dry winter and early spring runoff May 2006 peak flow at USGS Suncook River streamgage in North Chichester, NH was 7,600 cfs (Olson, 2007) with a recurrence interval of between 50 and 100 years. 3rd highest flood of record at USGS Suncook River streamgage 7-Day Precipitation Totals ending on May 18, 2006 May 2006 Flood – Suncook River Avulsion River channel shortened by 1/2 mile 150,000 yd3 of sediment introduced into river Steeper channel bed, increased velocities Impact on residences, businesses and infrastructure April 2007 Flood Flooding resulted from 3- day (April 16-18) rainfall event that dropped up to 7 inches of rain in areas of NH. April 2007 peak flow at USGS Suncook River streamgage in North Chichester, NH was 10,600 cfs (Flynn, 2008) with a recurrence interval of between 100 and 500 years. 2nd highest flood of record at USGS Suncook River streamgage. April 2007 Precipitation Totals nd (2 wettest April ever recorded in Concord, NH) Suncook River Peak Stages at Streamgage 01089500 Suncook River Flood Mapping Study, Sediment Characterization and Inundation Study FEMA funded the USGS to create updated flood mapping due to the avulsion and to assess characteristics and movement of sediments in the Suncook River from Epsom to the Merrimack River confluence so that predictions of riverbed stability and sediment movement could be made. USGS Suncook River Flood Inundation Pilot Study was conducted in cooperation with the New Hampshire Department of Safety, Division of Homeland Security and Emergency Management Data collected for Suncook River Flood, Sediment and Flood Inundation Studies ADCP Profiling of USGS Streamgaging Underwater Depths Sediment Data Field LIDAR and contour data Surveys from aerial imagery Flood Mapping and Sediment Study Suncook River Flood Study Report available online at : http://pubs.usgs.gov/sir/2010/5127/ USGS Scientific Investigations Report (SIR 2010-5127) with profile plots of the water surface elevations for the 10-, 50-, 100-, and 500-year floods from the Suncook River confluence with the Merrimack River to the upstream corporate limit for the town of Epsom, NH along with a digital flood map containing the delineation of the 100- and 500-year floodplain Suncook River Sediment Study Report available online at : http://pubs.usgs.gov/sir/2011/5088/ USGS Scientific Investigations Report (SIR 2011-5088) with determination of sediment loads and predicted change in streambed elevations and water surface elevations for the 2-, 5-, 10-, 50-, 100-, and 500-year floods from the Suncook River confluence with the Merrimack River to the upstream corporate limit for the town of Epsom, NH Flood Inundation Mapping Study Flood Inundation Mapping (FIM) is a real- time, operational tool that visually relates USGS streamgage readings and NWS forecasts to flood risk for the primary purpose of public safety, but also has significant benefits of: • Understanding changing natural processes that produce hazards • Development of hazard mitigation strategies and technologies • Effectively reduce vulnerability and repetition of loss to infrastructure • Promotion of risk-wise behavior Suncook River Flood Inundation Study Objectives Develop a flood information system for the Suncook River and adjacent floodplain as a pilot project for the northeastern region of the U.S. Project objective is to provide state and local officials and the general public with a means of obtaining detailed information on the extent of actual or forecasted flooding. Hydraulic Model 62 years of flow data at Suncook Streamgage Calibrated to April 2007 flood Hec-GeoRAS for inundation mapping HEC-RAS Suncook River Flood Inundation Study Scope Library of 10 flood inundation maps in increments and depths to provide detailed information on flooding that is occurring or is forecasted to occur by NWS. Inundation maps to be available on a USGS public web page with digital map images. Suncook River Flood Inundation Map Delineation of flood inundation maps accomplished using a combination of high accuracy/high resolution LiDAR elevation data along with 1- and 4- foot contour interval data (May 2007, April 2008, April 2010) referenced to NGVD29. Vertical datum for flood inundation maps is referenced to NAVD88. Grids of flood water depths (using HEC-RAS) generated for each of 10 flood profiles ranging from 7’ to 18’ at USGS Suncook streamgage in North Chichester, NH. Base maps are a combination of digital ortho-photos collected by Eastern Topographics (2007, 2008) and 1-ft resolution color aerial imagery of southeastern NH (NHDOT, 2006) FIM: How does it work? Current Approach Current flood products focus on: • Real-time USGS streamgage data • NWS forecasts Difficult for someone to relate a “point” data value to their front step a block or a mile away from the gage Have to rely on memory of past events to relate personal risk NWS NRFC Forecast Hydrograph http://water.weather.gov/ahps/ Suncook River Flood Inundation Map: Online Application These maps will be available at a USGS Web portal (http://water.usgs.gov/osw/flood_inundation/ and http://wim.usgs.gov/FIMI/FloodInundationMapper.html) in conjunction with the real-time stage data from the USGS streamgage at Suncook River (station 01089500) and National Weather Service flood-stage forecasts to help to guide the general public in taking individual safety precautions and provide local officials with a tool to efficiently manage emergency flood operations and flood-mitigation efforts. Flood Inundation Map: How does it work? New Approach An aerial view of inundated areas directly linked to USGS streamgage and NWS forecast information Static map library of 10 intervals starting at NWS flood stage and going up to (and beyond) historic flood levels Related to Minor, Moderate, and Major flood NWS classifications Flood Inundation Map: Online Application USGS Flood Inundation Mapper http://wim.usgs.gov/FIMI/FloodInundationMapper.html Who Benefits? Emergency responders Position equipment Evacuate those in harms way Political Entities Rapid, early damage estimates Those in the floodplain Depth and location of flooding Access/Egress Final Products Hydraulic model for a 16.5 mile study reach of the Suncook River. Public web page displaying current streamflow conditions, flood warnings, potential flood inundation areas and depth maps for a 16.5 mile reach of the Suncook River. USGS Scientific Investigations Map (SIM) Report describing results of flood inundation mapping. Example map sheet from Suncook River SIM report 3196 Suncook River Flood Inundation Study Report available online at : http://pubs.usgs.gov/sim/3196/ Or via a link at : http://suncookriver.org/ (CNHRPC website) Online application will soon be available at : http://wim.usgs.gov/FIMI/ FloodInundationMapper.html Or via a link at : http://water.usgs.gov/osw/ flood_inundation/ Questions? .
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