Broadway Lake Dam Outfall Stabilization Project
Jon Batson & J.P. Johns, PE
Education Track: Erosion & Sediment Control
In December 2014, a routine inspection was conducted by the Upstate Environmental Quality Control (EQC) on the Broadway Lake Dam in Anderson County. In April 2015 EQC sent a letter to the County requiring that a corrective action plan and implementation schedule be created and submitted to address the issues identified at the dam. Additional investigations of the riser barrel were conducted in September 2015. In response to historic flooding event in October 2015, DHEC issued an Emergency Order for Broadway Lake Dam on October 19, 2015, listing the Dam as code orange and ordering the lake level be lowered until the observed issues were addressed and a corrective action plan was submitted. The County worked with the State to reach an agreement regarding issues identified in Emergency Order, noting that these issues were present prior to historic flooding event and were not a result of the event. The issues addressed included:
· Failure of the concrete flume located on downstream side of dam.
· Sever headcut formed at the downstream end of flume.
· Trees of various sizes located on downstream embankment.
· Three large trees fallen across stream channel immediately downstream of the outlet.
· Low, soft areas with erosion located on downstream embankment.
· Undercutting of primary outlet barrel and severe erosion of the downstream receiving channel.
This presentation will outline the process and procedures the County utilized to remain in compliance with the State, and highlight the design utilized and constructed in 2017 to address the issues identified at the dam.