Drainage Design, DFW Connector Design/Build Project, TxDOT, Dallas, Denton and Tarrant Counties, TX

IEA provided project-wide drainage design for the DFW Connector. The limits of the drainage design include SH 114 from Kimball Avenue to Main Street, SH 121 from Hall Johnson to SH 114 merge, SH 26 from Kimball Avenue to the east of Baylor Pkwy, SH 360 from south of Stone Myers to SH 121, and FM 1709 from west of Gateway Drive to SH 114. IEA’s responsibilities included researching and developing project specific drainage criteria and standards; establishing existing conditions through site visits and recording document research; setting up a GEOPAK Drainage software database specific to project standards and drainage criteria; designing drainage details necessary for project needs; coordinating drainage elements with TxDOT, area FEMA flood plain managers, and other agencies or project partners; coordinating design with all other disciplines (structures, roadway, geo technical, etc.); and writing the hydraulic report for the DFW Connector and other reports necessary for permitting.

The drainage design included 7 stream crossings with bridge class culverts, 5 detention ponds, and closed and open drainage systems. The schematic design recommended large detention ponds outside the proposed right-of-way (ROW). IEA’s innovative drainage design eliminated the need to purchase ROW beyond the proposed ROW lines.

Hydrographs and peak flows were calculated using HEC-HMS (v3.3) and GEOPAK Drainage; HEC-RAS (v4.1.0) and HY-8 were used for hydraulic analyses. Detention routing calculations were completed using HEC-HMS.