The Great Flood of 1993

1
The Great Flood of 1993
2
Mississippi River at St. Louis - Normal Flow
3
Mississippi River at St. Louis - 1993 Flood
4
Before
During
5
Floods

• Where does the water come from?
• Rain
• Snow
• Glaciers
• Where does the water go?
• Rivers and river systems watersheds

6
WATERSHED

• Land from which water runs off into a stream.
• Tributary feeder stream that flows into a main
  stream.
• Example Illinois River into the Mississippi
  River
• Distributary a smaller stream flowing out of a
  larger stream.
• What separates watersheds
• Divides

7
Illinois Watersheds
8
Part of the Northern Mid-West Watershed
9
Mississippi River - Controlled

• Levee natural and/or constructed ridge or
  embankment designed to prevent a river from
  flooding onto its floodplain?
• Floods occur when water flows over or breaks
  through a levee

10
Mississippi River Record Low 1933
11
Flood Conditions at Quincy, IL Summer 93
12
House Near Quincy, IL
13
(No Transcript)
14
Railroad on Levee
15
Quincy Floodplain
16
Flooded Farm at Quincy, IL
17
(No Transcript)
18
Farmland Before and After
19
Flooded Bridge at Quincy
20
Floods Effect on River Shipping
21
Valmeyer, IL levee system
22
Levee Breaking at Valmeyer,IL
23
Levee Over-Flowing
24
Break in Levee After the Flood
25
Rescue Workers
26
(No Transcript)
27
(No Transcript)
28
(No Transcript)
29
New town site on the Illinois Bluff
30
Valmeyer, New Town Site