CONCRETE FLOOD WALL
Floodwall is constructed where clearance would be too restricted
for levee construction. The floodwall is constructed of reinforced
concrete with a steel sheet pile cutoff.
There are two specific types of concrete floodwall, I-Wall and TWall.
Each type has several different designs to accommodate
different conditions. Concrete floodwall is constructed on-top
“sheet pilings” (pictured at left). T-Wall sheet piling was driven
through the soil down to bedrock.
The “T” type wall has an average height of 10 +/- feet above the
landside ground surface and is about 4,040 feet long. The “I”
type wall has an average height of about 9 +/- feet above the
landside ground surface and is about 8,060 feet long.
Construction of the floodwall began in 1947 and was completed in
I-Wall has 3 different design types and T-Wall, 7 design types. Floodwall is constructed as free standing panels/monoliths approximately 25 feet in length.
There are approximately 500 panel sections that make up the entire length of the floodwall. The redline (left) indicates the approximate ground surface on the landside. There are about 10,000 linear feet of expansion joints throughout the length of the floodwall.
The concrete wall was poured as a reinforced cap over interlocking steel sheet piling. Sheet pilings provide two critical functions in the floodwall design; they support the concrete cap that rises to an average height of 10 feet above landside ground surface, and to block seepage
from the river to the landside. It is critical that the soil does not
become over saturated during an event. Once saturated, the
soils supporting a wall can quickly begin sliding, causing a
Wall “Type” Identification: Markings on the pilasters identify the
wall design type. Three vertical grooves indicate “T-Wall”, and
two grooves indicate “I-Wall (see drawing at right).
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