2009 Ohio GIS Conference
Presentation Abstract and Biography

A Flood-Warning System for Findlay, Ohio

Chad Ostheimer, US Geological Survey

Chad Ostheimer, PE BS in Civil Engineering from OSU, 1996 Chad has been a Hydrologist/Engineer with the USGS since 1996. He has extensive experience with surface-water modeling and GIS, and has been involved in numerous (22) FEMA Flood Insurance Studies, mixing studies, flood-inundation warning networks, dam-breach investigations, and watershed inventories. Chad has authored on topics including Hydrologic and Hydraulic Analyses, Flood-Warning Networks, and Mixing Studies.

Thursday, September 17, 2009 - 3:25 PM - Track 3

The U.S. Geological Survey (USGS) and the City of Findlay, Ohio completed a cooperative study in October 2008 to: (1) enhance the ability of the National Weather Service (NWS) to predict flood-forecasts for the City of Findlay by upgrading an existing stream gage and installing 4 new gaging stations to provide real-time streamflow and river-stage data to emergency managers; (2) provide city officials with the ability to receive automated warnings about flood stage or excessive rates of stage increase directly from the streamflow-gaging stations, (3) estimate the areas of the city that may be in danger of flooding based on NWS flood predictions and detailed GIS flood-inundation mapping overlain on existing orthographic images, and (4) provide city officials with a mechanism to show the public flood-inundation maps of current and/or projected conditions. The USGS provided the City of Findlay and the NWS with detailed flood-inundation maps for a series of gage-heights corresponding to the 2-year through the 100-year-recurrence interval flood levels. These flood-inundation maps are served by the NWS Advanced Hydrologic Prediction Service (AHPS) and are accessible by the public through the AHPS Web page. The public can see the predicted peak gage-height for the USGS stream gage, view the corresponding flood map for that predicted gage-height, and take appropriate actions if warranted.