Transportation Drainage

HHR specializes in drainage engineering consulting for transportation projects in the states of Texas, Georgia, North Carolina and Alabama. The majority of our engineers are Certified Floodplain Managers. Many have experience in teaching training courses on drainage design, have had technical papers published and provide expert witnessing for universities and state and local agencies. HHR is not only capable of providing practical and economical hydraulic design results but has a reputation in the industry for “thinking out of the box” and developing cost-effective solutions to complex issues.In an effort to serve our clients better, our engineers continue to update their skills by receiving continuing education in various software programs and engineering topics related to drainage and transportation. As leaders in our profession, HHR provides instructors and training courses in the fields of hydrology, hydraulics, and erosion control. Our principals and employees have been involved in the development of drainage standards, policies, and procedures for local and state governments.  As a result of our comprehensive hydraulic and hydrologic design experience we remain proficient in state of the art DOT drainage design standards and methods, including coordination procedures with FEMA, the U.S. Army Corps of Engineers, State environmental agencies, and local flood control districts.


Hydraulic Engineering

  • Watershed hydrology and analysis
  • Bridge and culvert hydraulics
  • Channel improvements
  • Storm Sewer and Culvert Design
  • Pump Station Design
  • Construction Plan Services (PS&E)
  • Stormwater management (detention, retention, water quality)
  • Detention Pond Analysis and Design
  • Bridge Scour Analysis
  • Erosion and Sediment Control
  • Hydrologic and Hydraulic Impact and Mitigation Analysis
  • Master planning
  • Third-party construction plan (PS&E) review

NFIP-related Submittals

  • Floodway No Impact analysis and certification
  • Base Food Elevation (BFE) determinations & permitting coordination

Project Management

  • Floodplain administration
  • Hazard Mitigation planning
  • Third party review of reports/designs
  • CRS program assistance
  • Coordination with federal, state and local agencies
  • Coordination with other consultants and disciplines
  • Scheduling
  • Quantity estimates, cost and alternatives analysis
  • Budget Management