Addicks Watershed Master Plan

Houston, Texas

Description:

The Harris County Flood Control District (HCFCD) retained LAN to prepare a master plan for the Addicks Reservoir Watershed. Containing five major sub-basins with more than 136 square miles of area, the Addicks Reservoir was built by the US Army Corps of Engineers in the mid-1940s to help mitigate the adverse effects of excessive stormwater from impacting heavily urban areas within the City.

Tropical Storm Allison flooding in 2001 initiated federal studies to update FEMA Flood Insurance Rate Maps and identify areas in need of more flood protection. The results of the federally sponsored studies were used in design.

Ultimate channel design incorporated a dual function ideology, having wide-benched channel sections that serve as recreational areas during low flows and will serve as additional linear storage during flood events. The channel design also incorporated sinuous, winding channels designed to allow vegetation and trees to grow within the channel limits, much like a natural stream. Study tasks included right-of-way assessment, coordination with local drainage entities, land developers, and the US Army Corps of Engineers in an effort to accurately project channel development to accommodate projected future development. Additionally, LAN is providing project management services for two adjacent watershed studies to assure continuity in design and methodology.

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