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Evaluation of Two Existing Flood Management Structures in U.S. Army Garrison Fort Gordon, Georgia, 2020

Open-File Report 2021-1121
Prepared in cooperation with the Environmental and Natural Resources Management Division of the U.S. Army Garrison Fort Gordon
By:
https://doi.org/10.3133/ofr20211121

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Abstract

Two existing flood management structures in U.S. Army Garrison Fort Gordon, Georgia, were evaluated for potential retrofitting to address water-quality impacts, pursuant of U.S. Army Garrison Fort Gordon’s storm water management program. Stormwater calculations were computed according to the Georgia Stormwater Management Manual, including drainage area delineations, design-storm runoff volumes and peak discharges, stage-storage and stage-discharge curves, and outflow calculations. The results of these analyses were compared to Georgia’s regulatory requirements for dry detention basins. The two existing flood management structures did not meet the requirements for a dry detention basin. Planning-level analyses for these basins indicate that the existing structures do not have adequate storage capacity for the overbank flood design-storm runoff volume (25-year, 24-hour storm) or the extreme flood design-storm runoff volume (100-year, 24-hour storm) and neither storm water structural control 2 nor storm water structural control 3 has the emergency spillway needed to safely convey overflows. Furthermore, land use changes (forest removal) and the risk for additional sediment loads to these structures may reduce available storage volume, increasing the risk for design failure. Three potential retrofit alternatives were provided for planning purposes only, with a brief discussion of advantages and disadvantages of each alternative retrofit strategy.

Suggested Citation

Stillwell, C.C., 2021, Evaluation of two existing flood management structures in U.S. Army Garrison Fort Gordon, Georgia, 2020: U.S. Geological Survey Open-File Report 2021–1121, 16 p., https://doi.org/10.3133/ofr20211121.

ISSN: 2331-1258 (online)

Study Area

Table of Contents

  • Abstract
  • Introduction
  • Stormwater Calculations for Existing Flood Management Structures
  • Comparison of Existing Flood Management Structures to Dry Detention Basin Design Criteria
  • Potential Retrofits to Existing Flood Management Structures
  • Summary
  • References Cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Evaluation of two existing flood management structures in U.S. Army Garrison Fort Gordon, Georgia, 2020
Series title Open-File Report
Series number 2021-1121
DOI 10.3133/ofr20211121
Year Published 2021
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) South Atlantic Water Science Center
Description v, 16 p.
Country United States
State Georgia
Other Geospatial Fort Gordon
Online Only (Y/N) Y
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional publication details