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<br />In Northeastern Illinois <br /> <br />Overlay Zoning <br /> <br /> <br />Stream channel <br /> <br />Buffer zone: natural vegetation <br /> <br /> <br />Floodway: no obstructions <br />to flood flows <br /> <br />Flood fringe: buildings must <br />be elevated or <br />f1oodproofed <br /> <br />., 1 I <br />I R-1 I R-2 R-1 I <br />I I l I <br />_ _ J. _ _ _ _ _ _ _ ..L _ _ _ _ _ _.l _ _ _ _ _ _ _ .l_ <br /> <br />Underlying zones <br /> <br /> <br /> <br />2.1.3 Open space preservation <br /> <br />It is generally recognized that the best approach to prevent flood damage is to keep the <br />floodplain open and free from development The foresighted acquisition of many acres <br />of floodplains by forest preserve districts has prevented untold millions of dollars in <br />damage and disruption. <br /> <br />Open space preservation should not be limited to floodplain areas. Some sites in the <br />watershed may be key to controlling runoff that adds to the flood problem (see the <br />discussion on the Butterfield Creek watershed in Figure 2-3). Preservation of <br />floodplain and natural water storage sites, such as wetlands and low lying areas, has <br />the added advantage of securing important recreational areas while preserving natural <br />habitats for local flora and fauna, all benefits to the general public. <br /> <br />Land use and capital improvement plans should identify areas to be preserved by <br />acquisition and other means. As an alternative to public ownership. an easement can <br />be purchased. With an easement, the owner is able to develop and use his or her <br />private property but property taxes are reduced or a payment is made if the owner <br />agrees to not build on the floodprone part or the part set aside in the easement In <br />some cases, the owner is allowed to develop the area for low hazard uses or to transfer <br />the right to develop other flood-free parcels (known as "TDR" or transfer of <br />development rights). <br />