Assisting the Harris County Engineering Department Recovery and Resiliency Division

In response to the devastation from Hurricane Harvey, the Harris County Engineering Department, with direction from the Commissioners Court, established the Recovery and Resiliency Division. One of the first actions of the department was to determine the potential reduction in flood risks from improvements to existing drainage infrastructure to increase our resiliency and shorten recovery from future flood events. Recommendations from these studies assisted in the prioritization of projects to move forward into design and construction.

LJA was hired by Harris County to prepare Preliminary Engineering Reports for five subdivisions spanning the County. LJA developed drainage improvement recommendations, prepared and attended community outreach meetings, conducted detailed hydrologic and hydraulic analyses, and prepared cost estimates to assist Harris County in developing partnership agreements and facilitate grant applications for Community Development Block Grant Disaster Recovery Program Funding and other grant programs. Hydrologic analyses utilized Atlas 14 100-year rainfall for 2D HEC-RAS modeling of overland flow paths. Channel improvements to FEMA studied streams used the Effective Flood Insurance Study HEC-RAS models for the 500-year event. Proposed infrastructure improvements included bridge replacements, regional detention ponds, storm sewer upgrades, channel widening, and street regrading to provide extreme event overflow paths.

Contact Dr. John Grounds III, PE, D.WRE, CFM and Michael Rappold, EIT , CFM for more information.