Question: James Scott caused the worst American flooding disaster since when?

<P0-S0> The history of flooding in Canada includes floods caused by snowmelt runoff or freshet flooding, storm-rainfall and "flash flooding", ice jams during ice formation and spring break-up, natural dams, coastal flooding on ocean or lake coasts from storm surges, hurricanes and tsunamis. Urban flooding can be caused by stormwater runoff, riverine flooding and structural failure when engineered flood management structures, including dams and levees, prove inadequate to manage the quantities and force of flood waters. <P0-S1>  Floods can also occur when groundwater levels rise entering buildings cracks in foundation, floors and basements. <P0-S2> . <P0-S3>  Flooding is part of the natural environmental process. <P0-S4>  Flooding along large river systems is more frequent in spring where peak flows are often governed by runoff volume due to rainfall and snowmelt, but can take place in summer with flash floods in urban systems that respond to short-duration, heavy rainfall. <P0-S5>  Flooding due to hurricanes, or downgraded severe storms, is a concern from August to October when tropical storms can affect Eastern North America. <P0-S6>  Flood events have had a significant effect on various regions of the country. <P0-S7>  Flooding is the costliest natural disaster for Canadians. <P0-S8>  Most home insurance claims in Canada deal with water damage due to sewer back-up, not fire. <SEP> <P1-S0> The 1960 Atlantic hurricane season was the least active season since 1952. <P1-S1>  The season officially began on June 15, and lasted until November 15. <P1-S2>  These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin. <P1-S3>  The first system, an unnamed storm, developed in the Bay of Campeche on June 22. <P1-S4>  It brought severe local flooding to southeastern Texas and was considered the worst disaster in some towns since a hurricane in 1945. <P1-S5>  The unnamed storm moved across the United States for almost a week before dissipating on June 29. <P1-S6>  In July, Hurricane Abby resulted in minor damage in the Leeward Islands, before impacting a few Central American counties — the remnants of the storm would go on to form Hurricane Celeste in the East Pacific. <P1-S7>  Later that month, Tropical Storm Brenda caused flooding across much of the East Coast of the United States. <P1-S8>  The next storm, Hurricane Cleo, caused no known impact, despite its close proximity to land. <SEP> <P2-S0> James Robert "Jimmy" Scott (born November 20, 1969) was convicted of causing a massive flood of the Mississippi River at West Quincy, Missouri as part of the Great Flood of 1993. <P2-S1>  He is currently serving a sentence of 20 years to life in a Missouri prison. <SEP> <P3-S0>  Within this zone, the flooded area totaled around 30000 mi2 and was the worst such U.S. disaster since the Great Mississippi Flood of 1927, as measured by duration, area inundated, persons displaced, crop and property damage, and number of record river levels. <P3-S1> The Great Mississippi and Missouri Rivers Flood of 1993 (or "Great Flood of 1993") occurred in the American Midwest, along the Mississippi and Missouri rivers and their tributaries, from April to October 1993. <P3-S2>  The flood was among the most costly and devastating to ever occur in the United States, with $15 billion in damages. <P3-S3>  The hydrographic basin affected over around 745 miles in length and 435 miles in width, totaling about 320000 mi2 . <P3-S4>  In some categories, the 1993 flood even surpassed the 1927 flood, at the time the largest flood ever recorded on the Mississippi.