Lyman Lake Spillway
Spillway reconstruction and dam safety enhancement
Quick Facts
Location
Lyman, South Carolina
Role
Prime Contractor
Completion Date
May 2023
Project Overview
This project consisted of the demolition and construction of a new reinforced concrete flume spillway to replace one that failed during a storm event in February 2020. The existing outlet structure was also upgraded to make it more resilient and effective for the owner.
Project Highlights
18,000
CY of Common Excavation
40,000
CY of Rock Excavation
2,000
CY of Dental Concrete
312
Rock Anchors
5,000
CY of Cast-in-Place Concrete
3,000
CY of Riprap
2,000
LF of Underdrain
1
Slide Gate and Stem Guide Replacement
Phillips Contribution
Phillips demolished and replaced the reinforced concrete flume spillway, including structural slabs, 20-foot walls, an underdrain system, rock anchors, vertical drains, and rock excavation. Upgrades to the existing outlet structure included a new slide gate, a new pedestrian bridge, and instrumentation and controls. Phillips was also responsible for improving access roads and the stream channel, installing riprap along the bank, final grading, and seeding.
During this project, work was performed in an existing stream. Phillips constructed a concrete cofferdam and installed it downstream of the work area to protect it. Storm events throughout the project also created fluctuating water levels. Phillips worked closely with the owner to maintain a lower lake level, providing extra storage in the lake for any storm event. A siphon system consisting of 13 – 24” HDPE pipes was installed to aid in controlling the lake level.
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