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City of Santa Ana Emergency Operations Plan <br />Part I Basic Plan <br />Roads <br />During a flood, dependable road connections are critical for providing emergency services. City and County road <br />systems often traverse floodplain and floodway areas. Federal, state, county, and city governments all have a stake <br />in protecting roads from flood damage. Transportation agencies responsible for road maintenance are typically <br />aware of roads at risk from flooding. <br />Bridges <br />In flood events, bridges are key points of concern because of their importance in the transportation network for <br />the movement of goods, people, and emergency services. During flood events, scouring of bed material supporting <br />their foundation can occur. Historically, this is the most common cause of bridge failures. Bridges in and of <br />themselves are also obstructions in a watercourse, restricting flows and causing stream instability. <br />Storm Water Systems <br />Local drainage problems are common throughout the City and most of the storm drain system is owned and <br />operated by the City. City Public Works staff is aware of local drainage threats. The problems are often present <br />where storm water runoff enters culverts or goes underground into storm sewers, when rainfall exceeds the <br />carrying capacity. Delayed maintenance or debris accumulating in the drainage system also contributes to the <br />flood hazard in urban areas. <br />76 <br />