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Anoka County Multi-Jurisdictional <br />All Hazards Mitigation Plan <br /> 92 <br /> <br />4.3.1 Natural Hazards <br />Hazard selection for mitigation planning is <br />primarily based on the historic occurrence of <br />disasters that have occurred in the jurisdiction. <br />However, new development and environmental <br />changes may introduce new hazards that must <br />be considered for inclusion in a mitigation plan. <br />Examples include a new industry that introduces <br />a hazardous material, the political climate, such <br />as 9/11, which introduced terrorism, and other <br />events such as human, animal and plant <br />diseases, and infestations. <br /> <br />Each participating municipality was tasked with <br />identifying and describing historical incidents of <br />hazards from local sources such as <br />newspapers, archives, etc. Anoka County <br />Emergency Management then combined the <br />local information with information from external <br />sources such as Minnesota State Homeland <br />Security and Emergency Management (HSEM), <br />Federal Emergency Management Agency <br />(FEMA), National Oceanographic Atmospheric <br />Agency (NOAA), National Weather Service (NWS), and other sources to develop a complete <br />historic analysis of hazards that have affected Anoka County and participating jurisdictions. <br /> <br /> <br />4.3.1.1 Flooding/Flash floods <br />Flooding occurs when abnormally high <br />stream flow overtops the natural or <br />artificial banks of a watercourse. The <br />three-principle types of floods, which <br />may affect Anoka County, are: riverine <br />floods, flash floods, and dam break <br />floods. <br /> <br />Overland flooding is a concern in Anoka <br />County for events that have a high <br />rainfall amounts over a short amount of <br />time. The prominent soil type in Anoka <br />County is sand which will allow normal <br />amounts of rain water to percolate <br />though the soil and move though the <br />storm water drainage systems move <br />water though the six Watershed <br />Districts in Anoka County. <br /> <br />Appendix B pages 48–69 illustrate the <br />structures and critical infrastructure in <br />Anoka county that are located in and <br />around the 100 and 500 year flood <br />44 CFR Requirement 44 CFR Part <br />§201.6(c)(2)(i): The risk assessment shall <br />include a] description of the … location and <br />extent of all natural hazards that can affect <br />the jurisdiction. The plan shall include <br />information on previous occurrences of <br />hazard events and on the probability of future <br />hazard events <br />A. Does the risk assessment identify the <br />location (i.e., geographic area affected) of <br />each natural hazard addressed in the plan? <br />B. Does the risk assessment identify the <br />extent (i.e., magnitude or severity) of each <br />hazard addressed in the plan? <br />C. Does the plan provide information on <br />previous occurrences of each hazard <br />addressed in the plan? <br />D. Does the plan include the probability of <br />future events (i.e., chance of occurrence) for <br />each hazard addressed in the plan? <br />