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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />"Flood-Proofing Regulations", the model code referred to prev.iously, was <br />adopted by reference and made part of the State Building Code by Minnesota <br />Regulations SBC 203. Also contained in SBC 203 are amendments that adapt <br />the model code to the terminology and requirements of the State flood plain <br />management program. The flood-proofing provisions of the State Building <br />Code apply only to those municipalities that have adopted the code and <br />~ave designated flood plain areas on their official zoning map. Thrs-map <br />identifies the Primary (and sometimes Secondary) Flood Hazard Area for the <br />building official (Figure 1). Flood-proofing provisions of tne State <br />Building Code are intended to provide a means of ensuring that structures, <br />permitted to be built within the flood plain by local zoning ordinances, <br />are adequately flood-proofed. In addition, they provide a basis for ensuring <br />that significant alterations, additions or repairs to nonconforming struct- <br />ures will upgrade the structures to meet adequate flood-proofing standards. <br /> <br />FLOOD HAZARD AREAS <br /> <br />Local flood plain zoning and subdivision ordinances regulate areas that would <br />be inundated by the 100-year flood. Flood plain areas are divided into a <br />floodway and a flood fringe (Figure 1). The floodway includes the channel of <br />the watercourse and those portions of the adjoining floodplain which are <br />reasonably required to carry and discharge the regulatory flood. Severe restric- <br />tions are placed on allY fill or structures allowed within this area: fill is <br />limited to the raising of localized land depressions to the level of the sur- <br />rounding land; and allowable structures are generally those accessory to open- <br />space uses such as park shelters. The remainder of the flood plain is called <br />the flood fringe and can be filled and developed without adverse effects to <br />adjoining property owners. <br /> <br />Flood-proofing provisions of the State Building Code apply to Primary and <br />Secondary Flood Hazard Areas. The Primary Flood Hazard Area is identical to the <br />100-year flood plain regulated by the zoning and subdivision ordinances. The <br />major flood threat within this area would come from the overland flow of flood <br />waters. Buildings constructed in the Primary Flood Hazard Area that are not <br />elevated by fill must be designed by a registered engineer or architect and must <br />comply with performance standards outlined in flood-proofing provisions of the <br />State Building Code. <br /> <br />The State Building Code also provides for designation of a Secondary Flood <br />Hazard Area. This area includes lands that could be subject to damage by floods <br />of a greater magnitude than the 100-year flood or that could sustain damage <br />from high ground water caused by the 100-year flood. These damages often vary <br />with soil conditions and could include sewer back-up or rupture, damages to <br />underground facilities, seepage through or even collapse of basement walls, or <br /> <br />3 <br /> <br />- <br />