Bridge Design Manual-Hydraulic Design

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Bridge Design Manual-Hydraulic Design

Size: 1 MB | Format: PDF | Quality: Unspecified | Publisher: Missouri Department of Transportation Bridge Division | Year: 2000 | pages: 60

Bridges and culverts are designed to pass the design flood discharge and at the same time meet backwater criteria. The return period or frequency of occurrence of an event is the average period of time between events equal to or exceeding the given magnitude. The annual probability of occurrence of an event is equal to the reciprocal of the return period. For example, a flood with a return period of 100 years has a 1% chance of occurring in any given year; whereas a flood with a return period of 25 years has a 4% chance of occurring in any given year. The design frequency, or return period of the design flood, varies by type of construction.

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