Text of Nomination of Levee Breach Sites to NRHP
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Text of Levees.org¶s nomination of sites of 17 th Street Canal breach and east side north breach of the Industrial Canal to the National Register of Historic Places August 2, 2011 Summary Paragraph This nomination focuses upon two sites where earthen levees and flood walls breached (failed) catastrophically in the City o f New Orleans, (Orleans Parish, Louisiana) on August 29, 2005 as pressure loads due to storm surge occurred resulting from the wi nds of Hurricane Katrina. One site is located on the 17 th Street Canal adjacent to t he 6900 block of Bellaire Drive along the western edge of the City in the Lakeview neighborhood. This canal is a drainage channel that provides for flows from the central portion of the city to Lake Pontchartrain on the north. The second si te, located on the east side of the Inner Harbor Navigation Canal (IHNC) is adjacent to the 2400 block of Surekote Road (parallel to Jourdan Road) in the s outheastern portion of the Ci ty. The IHNC connects Lake Pontchartrain to the Mississippi River, and forms the boundary between the Lower and Upper Ninth Ward neighborhoods. The nominated areas include only the locations of the actua l breach sites; they do not include the levees and flood walls themselves; the adjacent land, the canals, o r the city-wide drainage, flood protection, and navigation systems of which the sites are a part. Despite the subsequent reconstruction of the levees and floodwalls, the breach s ites are easily identifiable. Thus, their integrity and National Register eligibility remain intact. Description of Levee/Floodwall Breaches of Canals Before Hurricane Katrina, at the sites of both breaches, the canals were bounded by protective levees (sloped earthen walls) with steel sheet p ili ngs driven fro m the tops (crowns) in to the ground to a depth of b etween 10 and 50 feet. The sheet pilings were capped with concrete above the ground and were called floodwalls. The original size of the 17 th Street Canal b reach was 30 feet. This occurred when one 30-foot long monolith (concrete capped section of sheet p ile) was pushed toward the protected side by the wat er pressure in the canal thus creating the initial 30-foot wide breach. The ensuing del uge of floodwater caused m ore monoliths to fail resulting in a 450-foot wi de gap. The hydraulic force was s o great that it completely obliterated the levee, the sheet pilings and the soil that supported them. The east side north breach o f the IHNC failed in a nearly identical manner e xcept that the final size of the breach wa s slightly narrower (250 feet) and the sheet pilings came to rest in a dramatic wa y because they remained interconnected and
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Transcript of Text of Nomination of Levee Breach Sites to NRHP
8/6/2019 Text of Nomination of Levee Breach Sites to NRHP
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