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DA Flood This Incident -Specific Annex provides specific details to support effective response to and recovery from a flood emergency. It is intended to supplement the information and instructions in the Basic Plan. Situation and Assumptions Floods predominately occur during the rainy winter season (roughly November to March). They are caused by very heavy rainfall, or a long period of continuous or near -continuous moderate rainfall. More rarely, flooding can be caused by a break in water infrastructure. Floods may occur quickly (a flash flood), or they may slowly develop over a period of several days. The parts of the City at greatest risk for flooding are the bay islands and marshes in northern Redwood City and some waterfront areas north of US 101. Areas at an elevated but lower risk include large sections of downtown, the area north of Bay Road, areas near Cordilleras Creek, and the Redwood Shores neighborhood. The levees protecting Redwood City are maintained by the Redwood City Community Development Department's Engineering and Transportation Division. In the event of an emergency involving a levee, the City's Public Works Department would be responsible for responding. Flood events may cause one or more of the following direct impacts in Redwood City: • Destruction of power lines and power outages • Communication system outages • Water damage to vehicles and buildings • Structural damage to homes and nonresidential buildings • Road and street congestion from traffic light outages • Road and street closures or congestion from flooding or debris • Disruptions to water and wastewater services • Releases of hazardous materials • Fires from natural gas leaks or damaged electrical equipment • Mudflows in hilly areas • In severe instances, significant injuries or death to community members Major flood events could require significant mobilization of Redwood City resources. Such events may also require extensive coordination with external agencies to effectively conduct search and rescue, evacuation, sheltering, damage assessment, cleanup, and recovery activities. Concept of Operations For typical storms that cause little to no flooding, all necessary operations will be performed by normal City departments that usually handle such activities, including Public Works, Police, and Fire. These departments will act independently within their normal operating procedures to address any issues that may arise during the course of the storm event.