- FEMA MITIGATION ASSISTANCE PROGRAMS
Hamburg Green Oak Nonstructural Report
On the request of Hamburg Township and Green Oak Township, a nonstructural flood risk reduction assessment has been conducted under the United States Army Corps of Engineers (USACE) Detroit District Silver Jackets Program, to assess the flood risk determined by the project report: Hydraulic Modeling and Flood Inundation Mapping for the Huron River and Ore Lake Tributary, conducted in partnership with the United States Geological Survey (USGS). The USGS report provides information on the hydraulic modeling and resulting flood elevations that were used to create the flood inundation maps. The USACE used the flood inundation maps to determine the structures to collect data on for this study. A total of 225 residential structures were examined along with their sewer grinder pump structure elevations. The objective of this assessment is to identify an opportunity for the use of potential flood mitigation techniques, generally referred to as nonstructural flood risk reduction measures that will reduce the risk of damages to structures within the study area. View the report for more.
Huron River near Hamburg, Michigan, flood-inundation model and field data
Digital flood-inundation maps for an 8-mile (mi) reach of the Huron River from downstream of Rickett Road to Strawberry Lake, Michigan, were created by the U.S. Geological Survey (USGS) in cooperation with Green Oak and Hamburg Townships, and the U.S. Army Corps of Engineers. The flood-inundation maps also include a 1.16-mi reach of the Ore Lake Tributary until it joins the Huron River, approximately 2.22 mi downstream of Rickett Road. The flood-inundation maps, which can be accessed through the USGS Flood Inundation Mapping Science web site at http://water.usgs.gov/osw/flood_inundation/, depict estimates of the areal extent and depth of flooding corresponding to selected water levels (stages) at the USGS streamgage on the Huron River near Hamburg, Michigan (station number 04172000). Near real-time stages at this streamgage may be obtained on the Internet from the USGS National Water Information System at http://waterdata.usgs.gov/ or the National Weather Service (NWS) Advanced Hydrologic Prediction Service at http:/water.weather.gov/ahps/. The NWS Advanced Hydrologic Prediction Service also provides forecasted flood hydrographs at this web site. Flood profiles were computed for the stream reach by means of a one-dimensional step-backwater model. The hydraulic model was calibrated by using the current stage-discharge relation at the Huron River near Hamburg, Mich., streamgage and was calibrated to water levels determined with stage sensors (pressure transducers) temporarily deployed along the stream reach. The hydraulic model was used to compute a set of water-surface profiles for flood stages ranging from 7.0 to 10.5 feet (ft). This range represents stages just above 6.0 (bankfull) to 2.04 ft above the maximum recorded stage at the USGS streamgage on the Huron River near Hamburg, Mich. (station number 04172000). The computed water-surface profiles were then combined with a Geographic Information System digital elevation model (derived from light detection and ranging [lidar] data having a 0.49-ft vertical accuracy and 3.8-ft horizontal resolution) to delineate the area flooded at each water level. The availability of these maps, along with Internet information regarding current stage and forecasted high-flow stages from the NWS, will provide emergency management personnel and residents with information critical for flood-response activities such as evacuations, road closures, and postflood recovery efforts.
Updating Expected Rainfall Frequencies in a Changing Climate Dr. Momcilo Markus Hydrologist/Hydroclimatologist, Illinois State Water Survey Research Assoc. Prof., Dep. of Nat. Res. and Environ. Sci. Research Assoc. Prof., Dep. of Agric. and Biol. Eng. University of Illinois at Urbana-Champaign
Flood Inundation Mapper
The USGS Flood Inundation Mapper allows users to explore the full set of inundation maps that shows where flooding would occur given a selected stream condition. Users can also access historical flood information and potential loss estimates based on the severity of the flood. The FIM Mapper helps communities visualize potential flooding scenarios, identify areas and resources that may be at risk, and enhance their local response effort during a flooding event. The legacy mapper is located here, and is slated to be decommissioned once historic flood information is added to this interface.
MITIGATION ASSISTANCE PROGRAMS:
Hazard Mitigation Assistance Guidance - Doc 1
Hazard Mitigation Assistance Guidance - Addendum - Doc 2
FEMA 301 Complete - Program - Doc 3
Updated: April 15, 2020