Hollaway serves the Harris County Flood Control District and LAN as the Environmental Program Manager supporting $110 million in projects for the Halls Bayou Watershed as authorized by the 2018 Flood Control Bond.

The Halls Bayou watershed covers more than 45 square miles and 20 miles of linear stream within Harris County, and Hollaway supports environmental compliance and field studies necessary to develop and deliver damage reduction projects throughout the watershed. Projects include the construction and design of stormwater detention basins, as well as channel and drainage improvements along the bayou and its tributaries.

Hollaway is responsible for planning and conducting environmental surveys, technical reporting, and required Clean Water Act (CWA) permitting and mitigation requirements. Hollaway biologists have conducted species-specific surveys, migratory bird surveys, and ASTM-compliant Phase I Environmental Site Assessments. Hollaway maintains close and frequent coordination with Flood Control District, as well as state and federal regulatory agencies to ensure appropriate environmental compliance is achieved. Hollaway also works closely with the engineering teams in identifying environmental constraints, developing alternatives, and informing project designs for programmatic flood damage reduction within the watershed.