Using Technology to Meet the MNGWPD Floodplain Mapping Requirements
MetadataShow full item record
The recent guidance and required floodplain management ordinances developed by the MNGWPD have created new flood study and floodplain mapping requirements for the 16-county District covering greater metro Atlanta. Meeting the new floodplain mapping requirements will address an important need in light of recent and continuing growth, while also creating technical and fiscal challenges for district municipalities. The MNGWPD now requires all it's communities to develop future conditions 100-year floodplains, and strongly urges flood studies to be conducted up to a 100-acre drainage point, rather than simply up to the traditional 1 square mile (640 acres) drainage area limit historically used by FEMA. Leveraging the latest GIS, modeling, and terrain capturing technologies can enable communities to accurately and efficiently meet the new flood study and mapping requirements. This paper examines the different approaches utilized in the completed flood study program in Gwinnett County, the recently launched Countywide floodplain mapping program in DeKalb County, as well as ongoing efforts in Cobb County.