Columbia provided emergency professional assistance during and in the aftermath of the September 21, 2009 flood event. Responsibilities included monitoring 4 Category I NRCS Watershed Dams during the flood event, Emergency Action Plan coordination, flagging and surveying high water marks countywide, culvert inspections on 25 roads that overtopped, H&H analysis, design, and plan development for replacing 9 culverts that failed and resulted in road closure, and construction inspection and management for 2 of the culvert replacement projects.
Dam monitoring required us to be on site at the dams to monitor flood stages during the day of September 21st throughout the night and into the morning of September 22nd. Columbia was in contact with authorities throughout the night to coordinate the Emergency Action Plan installed by Gwinnett County which involves contacting all homeowners that would be in danger should a dam break have occurred.
After the flood events, Columbia was tasked with finding and surveying the high water marks at different stream crossings throughout the county. High water marks were flagged by engineers at the upstream and downstream end of culverts using indicators left by the storm event and the locations were later flagged by the survey team. The culverts were also inspected by the engineers to monitor any damage the storm may have caused.
Columbia prepared emergency design plans for culvert replacement for 9 culverts that failed during the storm events. These culvert projects included: Cannon Hill Road, North Pounds Drive, Tanglewood Drive, West Park Place Boulevard, Four Winds Drive, River Valley Drive, and Outer Bank Drive.
Columbia prepared the designs within the time constraints presented by culverts that were failing and causing road closures. In order to minimize the times that the roads were closed, the plans were expedited. All plans were turned in by September 30, 2010.
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