美国陆军工程师团修建了一座9m高的潜坝,以阻止盐水进入新奥尔良以南的城市取水建筑物。潜坝横跨河流宽518m,设计来阻止每年不断沿河床向上游爬升的浓盐水层。陆军工程师团每年监视盐水楔移动,当盐水楔接近供水进水口时,工程师团必须决定是花钱建一潜坝还是冒险让有100多万人口的新奥尔良市供水受到污染。1999年9月,陆军工程师团授与路易斯安那州圣查尔斯市迈克·霍克斯公司140万美元的疏浚合同。这是陆军工程师团第二次 The U.S. Army Corps of Engineers constructed a 9-meter-high submerged dam to stop salt water from entering urban waterworks south of New Orleans. The submarine is 518m wide across the river and is designed to stop the thick brine layer that continues to climb up the riverbed every year. The Army Corps of Engineers monitors the movement of salt wedges each year and as the salt wedges approach the water intakes, the group of engineers must decide whether to spend money on building a submarine dam or to risk polluting New Orleans’s water supply, which has more than a million people. In September 1999, the Army Engineer Group awarded a $ 1.4 million dredging contract with Mike Hawkes, St. Charles, Louisiana. This is the second time Army Engineering Division