Design and Performance of Emergency Spillway Channel Erosion Protection—Grenada Lake Dam, Grenada, Mississippiby Paul Barnes, US Army Engineer District, Vicksburg, United States,
John E. Hite, Jr., US Army Engineer District, Vicksburg, United States,
Abstract: Grenada Lake Dam located on the Yalobusha River in northeast Mississippi is part of the Mississippi River and Tributaries comprehensive plan for flood control. The 13,000-ft-long earthfill-type dam averages 80 ft above the streambed and was completed in 1955. An uncontrolled emergency spillway 200 ft wide, located in the south abutment, prevents overtopping of the dam. Flow over the spillway has occurred five times since 1973. Flow events between 1973 and 1983 caused severe degradation in the spillway channel which threatened the stability of the spillway stilling basin. Several erosion protection alternatives to repair the channel were evaluated. Gabions were selected and used for the repair work. The repair work was completed in 1985 and experienced a record event (a near 100-yr frequency flow) in 1991 without major damage or repair. The design procedures and constraints for this erosion protection project are presented along with a discussion of the performance to date.
Subject Headings: Spillways | Piping erosion | Developing countries | Lakes | Emergency management | Hydraulic design | Dams | Floods | Earthfill dams | Rivers and streams | Grenada | Mississippi | Mississippi River
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