SWMM Master Drainage Study, DFW International Airport
DFW Airport, TX

IEA was responsible for delivering complex modeling for a Master Drainage Study at DFW Airport. 

This project defined, analyzed, and assessed the existing conditions of the Mud Springs Watershed, one of the eight watersheds associated with Dallas Fort Worth International Airport (DFWIA). PC-SWMM was utilized for this project which provided DFWIA with an understanding of current and future hydrologic and hydraulic characteristics.

Subcatchments were delineated based on the DEM, and were coordinated with the team developing the adjacent watersheds since some watershed studies happened simultaneously. The rainfall depths for various recurrence intervals of the 24-hour duration design storm were collected from NOAA Atlas 14. Soil and land use data were used to develop the hydrologic parameters for the drainage area, including the average surface slope, impervious percentage, depth of depression storage on the impervious and pervious, and manning’s for the impervious and pervious. The first flush system was taken into the consideration by applying an initial abstraction. All drainage structure data provided by DFWIA were sorted first and the missing data was found from as-built. This complex model included 330 nodes and 476 links. The FEMA effective floodplain model was reviewed to determine the downstream boundary conditions of the watershed.

Pictured: 100-YR Floodplain Map