The flood wave on the upper Mississippi River started downstream near St. Paul, Minnesota, in June 1993. The maximum discharge propagated downstream at about 50 kilometers per day and was 5 to 7 times the mean daily discharge at streamgaging sites on the river. The propagation speed of the flood wave was influenced more by hydrologic factors such as tributary inflow and flood-plain storage than by hydraulic factors. The maximum discharge at St. Louis, Missouri (29,700 m3/s) occurred on August 1, 1993; but because of flood-plain storage resulting from levee failures and seepage through and under levees downstream, the maximum discharge at Thebes, Illinois, (27,700 m>3/s) did not occur until August 7 which was about 4 days later than normal.
Additional publication details
USGS Numbered Series
Propagation and composition of the flood wave on the upper Mississippi River, 1993
U.S. Geological Survey,
vi, 21 p. :ill. (some col.), col. map ;28 cm.28 cm.