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HomeMy WebLinkAboutA010 - portion of Ordinance No. 2745 ORDINANCE NO. 2745 AN ORDINANCE CREATING FLOODWAY AND FLOODWAY FRINGE DISTRICTS; DEFINING THE SAME; SETTING FORTH REGULATIONS THEREOF; AND ESTABLISHING AN EFFEC- TIVE DATE that: BE IT ENACTED, by the City Council for the City of Ames, Iowa 4tP^ Section One. Statutory Authorization, Findings of fact, and Purpose (1) Statutory Authorization. The legislature of the State of Iowa has, C)A in Chapter 414 Code of Iowa, delegated the responsibility to cities to enact zoning regulations to secure safety from flood and to promote health and the general welfare. (w'e (2) Findings of Fact. (a) The flood hazard areas of Ames are subject to periodic inundation which can result in loss of life and property, health and safety hazards, disruption of commerce and govern- mental services, extraordinary public expenditures for flood protection and relief, and impairment of the tax base; all of which adversely affect the health, safety, and general welfare of the community. These losses, hazards and related adverse effects are caused by the occupancy of flood hazard areas by uses vulnerable to flood damages which create hazardous conditions as a result of being inadequately elevated or other- wise protected from flood, and the cumulative effect of flood plain construction on flood flows, which causes increases in flood heights and flood water velocities. (b) The following regulations rely on engineering methodology for analyzing flood hazards which is consistent with the standards established by the Iowa Natural Resources Council including: (i) Determination of flood magnitudes and the corresponding flood frequencies by statistical and engineering calcula- tions which permits a consideration of such flood factors as expected frequency of occurrence, area inundated and depth of inundation. (ii) Calculation of water surface profiles based upon a hy- draulic engineering analysis of the capability of the stream channel and overbank areas to convey flood flows. (iii) Computation and delineation of a floodway, an area which must be reserved (no obstructions) for conveyance of flood flows so that flood heights and velocities will not be substantially increased by future encroachment on the flood plain.