打开莫干扎分洪道(Morganza Spillway)是为了缓解巴吞鲁日和新奥尔良的堤坝压力。

Opening a channel, the Morganza spillway, is meant to relieve pressure on the levees protecting the cities of Baton Rouge and New Orleans.

泄洪道，分洪道，溢流槽天然或人造的泄洪渠或泄洪管道，以引导洪水绕过或远离城市中心或人口稠密地区。

Floodway; high-flow diversion Natural or man-made bypass channels or conduits that redirect flood waters around or away from urban centers or area of high population density.