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<br />1:1 <br /> <br /> <br />000785 <br /> <br />carry and discharge flood flows without unduly raising upstream <br />water surface elevations, The second objective of rel_.'ulation <br />is to encourage sound land use consistent with the flood hazard <br />and the community land use needs. <br /> <br />Zoning is the legal tool used by cities, towns and coun <br />ties to control and direct the use and development of land and <br />property, The zoning ordinance is used to implement and en- <br />force the comprehensive plan which has no legal status, I,'lood <br />plain zoning is not a special type of or'dinance but me r'cly anothe r' <br />set of provisions which can be incorporated into the eom(H'ehen- <br />sive zoning ordinance so that flood damage can be minimized, <br /> <br />These considerations led the l!J6!i Iowa legislature to <br />enact the new flood plain r'egulation Ad, (Iowa Code l!l66, <br />sec, 455A. :15) Under the Act, the Council may establish and <br />enforce regulations for the orderly development and wise use <br />of the flood plains of any dver or stream within the State, and <br />alter, change or revoke the same, The Council shall determine <br />the characte r'istics of floods which reasonably may be expected <br />to occur and may by order' establish ener-oaehment limits, pr'o- <br />tection methods, and minimum protection levels appropriate to <br />the flooding characteristics of the stream and to reasonable <br />use of the flood plains. The Council may cooperate with and <br />assist local units of government in the establishment of en- <br />croachment limits, flood plain regulations and zoning ordinances <br />relating to flood plain areas within their' jurisdiction. <br /> <br />Flood plain information studies arc completed or <br />underway for several areas of the State, Heports have been <br />prepared and published by the U, S. Corps of Engineers for <br />streams at Cedar Rapids, Davenport and Ames. A study of <br />the Iowa River at Iowa City was made by the Hesources <br />Council in ID60 and regulations based on the study and govern- <br />ing use of the floodway and flood plains were adopted in 1!J62 <br />by the City as part of its comprehensive zoning ordinance <br />(See Plate 1, Iowa City l.'lood Plain Regulation). The ordinance <br />permits only open-type uses in the floodway area and, in <br />those flood plain areas not needed for conveyance, pe rmits <br />development consistent with the adjoining use district pro- <br />vided the area is filled to a specified elevation, <br />