This year’s Mississippi River flood is the worst in decades, with record flood stages set in many places throughout the system. There are two main ways to deal with the threat of river flooding:
1) Build huge levees to contain the water.
2) Create outlets where water can be released from the river.
There are a few other possible solutions, but those are the two major ones. Unfortunately, each has its drawbacks. Levees force a river through a narrower path; the only place for the water to go is up, causing the river to get higher, so that the levees must be built taller, and so on. Along the Mississippi, the building of levees has historically been combined with a practice of shutting off almost all of the natural distributaries of the river. It doesn’t take an expert hydrologist to figure out that closing off places where water flows out means more water downriver.
Using outlets of some sort—diversions into other rivers, spillways, or simply flooding large areas of low-lying land—can damage the property or livelihood of whoever owns the land that is deliberately flooded. In some cases—for example, the Bonnet Carré Spillway—only a small amount of land is used. The Bonnet Carré is roughly six miles long and two miles wide; it empties into Lake Pontchartrain. Though the spillway is used for recreation purposes when not in use for flood control, there are no land owners to appease. Thus, it is fairly low-risk (from a political standpoint) to open it up. Sending dirty river water into the lake does annoy the environmentalists and the fishermen, but all things considered it’s not going to piss anyone off too much. Continue reading ‘saying that the morganza shouldn’t have been opened’