PROTECTING OUR NATIONAL HERITAGE - THE WASHINGTON, D.C., LEVEE

摘要

The existing Potomac Park flood protection system was authorized by the Flood ControlAct of 1936 following a devastating flood in March of that year. Construction wascompleted in 1940 and the system consists of an earthen berm that extends from theLincoln Memorial on 23rd Street to the National Monument on 16th. The berm runsalong the north side of the Reflecting Pool and has an opening at the roadway of 17thStreet that can be closed using sand bags and an earthen berm.The National Park Service and the Corps of Engineers – Baltimore District are upgradingthe flood protection system for our Nation's capital. As part of the first phase of work,Tetra Tech designed and is providing construction support for a new closure structure at17th Street. The new closure consists of a removable post and panel closure structureacross the 17th Street and two permanent reinforced concrete floodwalls located outsidethe 17th Street right-of-way. The reinforced concrete floodwalls are veneered with stonesthat are compatible with the nearby existing structures and surrounding environmentalsettings.The second phase of the project will consist of designing and constructing a new leveealong 23rd Street at Constitution Avenue, raising the Reflecting Pool levee to withstandthe project design flood, and designing and constructing a new closure alignment nearFort McNair on the south side of the City. Tetra Tech is currently designing this secondphase of the project.