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Floodwall Essay

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Floodwall is freestanding and permanent engineered defense structure that is designed to against inundation adjacent to the protected area. One side of floodwall is subjected to hydraulic pressure, where the opposite side is subjected to earth pressure. But, it is subjected a greater hydraulic pressure than any resisting earth pressure on the other side. It is made of reinforce concrete or masonry rather than the earth material which indicates this wall is more resistant to erosion and scour, and also effectively to resist water seepage (http://www.fema.gov/media-library-data/20130726-1506-20490-7472/fema259_ch5f.pdf). Generally, it can be constructed along the edge of riverbank and subjected to long-term loadings for hours or days, where this …show more content…

Retaining wall refers to any wall that retains material and maintains at a same elevation, whereas the floodwall is used to avoid inundation over the protected area behind it. Other than that, floodwall may encounter a problem that is the seepage through or beneath it. If without a proper seepage protection, the stability of the floodwall is affected by uplift force or loss of support due to erosion and scour. However, retaining wall does not require the seepage protection to against the hydrostatic or hydrodynamic pressure from the water-side of floodwall. It is only need the water stops to resist the water from the backfill to pass through the vertical joints. For the retaining wall, all forces act on it are come from the backfill. Unlike the floodwall, hydraulic forces act as part of the loads hit on the wall and may become severe during the flood events. Generally, floodwall possesses a weak foundation condition as it is located in a flood plain, so the uplift forces act as the main reason to cause foundation instability. But, retaining wall does not encounter the weak foundation condition induced by flood

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