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https://hdl.handle.net/11681/34613| Title: | Sweetwater Creek Flood Risk Management Feasibility Study: Final Integrated Feasibility Report and Environmental Assessment |
| Authors: | United States. Army. Corps of Engineers. Mobile District |
| Keywords: | Flood control Environmental management Sweetwater Creek (Cobb County and Douglas County, Ga.) |
| Publisher: | United States. Army. Corps of Engineers. Mobile District. |
| Abstract: | The purpose of the study, as identified by the Project Delivery Team, is to investigate the Federal interest and feasibility of a FRM project to address flooding in the Sweetwater Creek Watershed specifically, inside Cobb County, Georgia. The need for the study was identified because in September 2009, catastrophic flooding impacted the Atlanta metropolitan area as a result of multiple days of prolonged rainfall. According to the rain gauge at Douglas County Water and Sewer Authority the maximum 24-hour rainfall total for September 20-21 was 21.03 inches, which represents a 0.01% annual chance of exceedance rainfall event. Historic flash flooding resulted, with flooded river basins remaining swollen for weeks which resulted in numerous flood records being set. Some locations observed conditions exceeding the 0.2% chance of occurrence in a given year. Clarkdale Elementary School, in Austell, was flooded to the roof line while Austell Primary School was surrounded by water. Further, the historic recorded crests of the U.S. Geological Survey gauge on Sweetwater Creek below Austell, Georgia, from 1937 to 2015, as shown below, demonstrate an increase in flood event frequency. Major floods are 17-foot or greater crest, while moderate floods have a 13- to 17-foot crest, and minor floods have a 10- to 13-foot crest. The highest recorded crest is 30.82 feet, which occurred in September 2009, and had a stream flow of 31,500 cubic feet per second. |
| Description: | Feasibility Report and Environmental Assessment |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | https://hdl.handle.net/11681/34613 |
| Appears in Collections: | Environmental Documents |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Sweetwater Creek Flood Risk Management_2019.pdf | 9.25 MB | Adobe PDF |  View/Open |