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Hebron Hydrologic & Hydraulic Floodplain

The Village of Hebron partnered with our team to address heavy flood events frequently affecting their community. Their effective FEMA model was nearly 20 years old and contained outdated structure and hydrologic information. In order to define base flood elevations more accurately, we completed a comprehensive hydrologic and hydraulic analysis of four miles of major stream network. Our detailed analysis led to obtaining a FEMA letter of map revision (LOMR).  We also provided strategic construction suggestions around the community, including diversion channels, ditch widening, additional flood culverts, and an automated canal and lock system to create detention and divert flood flows prior to and during heavy rainfall events.

Owner

Village of Hebron

Market Sector

Local Government

Primary Service Lines

Municipal Consulting, Resilient Water Solutions

Region

Columbus
Additonal Info

Project Highlights:

  • Services included obtaining information from various hydraulic models and flood studies in the area and merging that information into one composite hydrologic and hydraulic flood study. The USACE HEC-HMS 4.7 was utilized to complete the composite hydrologic model and USACE HEC-RAS 5.0.7 was used to create the composite hydraulic model.
  • A detailed analysis of the topography and existing/anticipated land uses within the watershed was performed to verify the accuracy of the parameters used in the prior models.
  • Due to the increased accuracy of hydraulic data obtained through field survey of cross-sections and drainage structure, the resultant model has provided the Village with more accurate base flood elevations throughout the municipality and has provided focus areas for improvements to decrease flood damage and reduce the base flood elevations across the Village.
  • Project deliverables included a hydrologic and hydraulic report outlining the data and methodology used, the findings of the study, and the resultant floodplain and floodway mapping.
  • Survey services included watershed analysis using LIDAR data and topographic field survey of stream cross-sections and drainage structures.

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