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160.01 STATUTORY AUTHORITY AND FINDINGS OF FACT.
   1.   The Legislature of the State of Iowa has in Chapter 414, Code of Iowa, as amended, delegated the power to cities to enact zoning regulations to secure safety from flood and to promote health and the general welfare.
   2.   Findings of Fact.
      A.   The flood hazard areas of the City are subject to periodic inundation which can result in loss of life and property, health and safety hazards, disruption of commerce and governmental services, extraordinary public expenditures for flood protection and relief, and impairment of the tax base all of which adversely affect the public health, safety and general welfare of the community.
      B.   These flood losses, hazards, and related adverse effects are caused by: (i) the occupancy of flood hazard areas by uses vulnerable to flood damages which create hazardous conditions as a result of being inadequately elevated or otherwise protected from flooding; and (ii) the cumulative effect of obstructions on the floodplain causing increases in flood heights and velocities.
      C.   This chapter relies upon engineering methodology for analyzing flood hazards which is consistent with the standards established by the Department of Natural Resources.