Water Resources Program 2019-2021

Key Project:

Develop Swatara Creek Flood Inundation Mapping


Priority Water Resources Need:

Improve Community Flood Preparedness


Project Location:

Dauphin County, Pennsylvania


Project Lead:

Project Description:

swatara creek aerial view In 2011, Tropical Storm Lee produced record flooding along Swatara Creek in Dauphin County. The United States Army Corps of Engineers (USACE) developed updated hydraulic modeling of Swatara Creek for the Federal Emergency Management Agency. SRBC and USACE are partnering on a project that will use the new hydraulic model to develop updated flood inundation mapping for priority stream reaches. The maps will show an expected area and depth of flooding based on observed and forecasted river stages for the Swatara Creek at Hershey and Middletown stream gages. The maps will be available on the National Oceanic Atmospheric Administration Advanced Hydrologic Prediction System (AHPS) website and serve as a valuable flood preparedness tool for emergency managers and the public.


Challenges:
  • Calibrating hydraulic model to one foot stage increments
  • Ensuring continuity of flood mapping between two river forecast points
  • Convincing stakeholders to use mapping for flood preparedness

Key Milestones:
  • •  Develop Depth Grids and Inundation Layers
    (September 2018)
  • •  Deploy Maps on AHPS Website
    (March 2019)
  • •  Complete Public Outreach
    (June 2019)