floods

Residents of the central and southern Midwest are crossing their fingers, saying their prayers, planning evacuations, and in some cases filling sandbags in preparation for the excessive water Image courtesy of NOAAWUSTL geologist Robert Criss warns of “serious water” that could give some areas their second worst flood on record. ravishing communities in Iowa and Wisconsin. “The flood wave is propagating down the Mississippi River towards St. Louis at about the pace of a brisk walk,” said Robert E. Criss, Ph.D., professor of earth and planetary sciences in Arts & Sciences at Washington University in St. Louis. “Some areas north of St. Louis in Missouri and southern Iowa are bracing for the second worst flood in their history. This is serious water.”

Patterns in the Midwest this spring are eerily reminiscent of 1993 and 1994, back-to-back years of serious flooding. But Midwesterners have not learned “geologic reality,” says Robert E. Criss, Ph.D., professor of earth and planetary sciences in Arts & Sciences.

Photo courtesy of USGSLevees are not infalliable.Midwesterners have to be wondering: Will April be the cruelest month? Patterns in the Midwest this spring are eerily reminiscent of 1993 and 1994, back-to-back years of serious flooding. Parallels this year include abnormally high levels of precipitation in late winter and early spring, early flooding in various regions, and record amounts of snow in states upstream. One thing Midwesterners have not learned is “geologic reality,” says Robert E. Criss, Ph.D., professor of earth and planetary sciences in Arts & Sciences at Washington University in St. Louis.

In science, it’s best to be good, but sometimes it’s better to be lucky. Ecologist Owen Sexton, Ph.D., professor emeritus of biology in Arts & Sciences, had just completed a census of snakes at a conservation preserve northwest of St. Louis when the great flood of 1993 deluged the area, putting the preserve at least 15 feet under water. The flood provided Sexton with a rare opportunity: His collected data and the flood would combine to make “the perfect study” of how an area rebounds from natural disaster.

Sexton observes a flooded Marais Temps Clair.In science, it’s best to be good, but sometimes it’s better to be lucky. Ecologist Owen Sexton, professor emeritus of biology in Arts & Sciences at Washington University in St. Louis, had just completed a census of snakes at a conservation preserve northwest of St. Louis, when the great flood of 1993 deluged the area, putting the preserve at least 15 feet under water. The flood provided Sexton with a rare opportunity: his collected data and the flood would combine to make “the perfect study” of how an area rebounds from natural disaster.

Sexton observes a flooded Marais Temps Clair.In science, it’s best to be good, but sometimes it’s better to be lucky. Ecologist Owen Sexton, professor emeritus of biology in Arts & Sciences at Washington University in St. Louis, had just completed a census of snakes at a conservation preserve northwest of St. Louis, when the great flood of 1993 deluged the area, putting the preserve at least 15 feet under water. The flood provided Sexton with a rare opportunity: his collected data and the flood would combine to make “the perfect study” of how an area rebounds from natural disaster.

Robert Criss, Ph.D., professor of earth and planetary sciences in Arts & Sciences, has analyzed data from the Lewis and Clark expedition and says it shows that the Missouri River today is but a shadow of what it was two hundred years ago, narrower and more prone to serious flooding.A geologist at Washington University in St. Louis and his collaborator at Oxford University have interpreted data that Lewis and Clark collected during their famous expedition and found that the Missouri River has markedly narrowed and its water levels have become more variable over the past two hundred years. This narrowing, or channeling, created by wing dikes and levees constructed mainly in the 20th century, has put the Missouri River at an increased risk of more damaging floods, the authors say. They blame the fact that the river cannot spread out as it did naturally at the turn of the 19th century, thus forcing water levels higher. More…

WUSTL scientists say the present-day Missouri River is narrower and more prone to flooding because of extensive damming of the river.The oldest data available on the Missouri River – from the logs of Lewis and Clark – show that water flow on the river today is far more variable than it was 200 years ago. The data also show that the river is some 220 yards narrower at St. Charles, Mo., today at 500 yards across than in 1804 when it spread out some 720 yards.

Lowry explores the dynamics behind efforts to restore rivers.As America celebrates the bicentennial of Lewis & Clark’s epic journey up the untamed Missouri River, the nation finds itself on the verge of a new era in modern river management, one in which proponents of environmental protection and ecosystem restoration stand on equal footing with those of the hydropower, barge and boating industries. In a new book, Dam Politics: Restoring American Rivers (Georgetown University Press, 2003), noted environmental politics expert William R. Lowry explores the dynamics behind recent efforts to restore American river systems to a more pristine state. The politics of river restoration run deep, and it is politics, argues Lowry, that will ultimately dictate the success or failure of future efforts to restore and preserve the nation’s riverways.