. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Floodplains. Wetlands and Deep Water Habitat Public Lands n% Within One Mile B% Outside One Mile Source: hfWRlC Inventory ofLandbased Disposal Sites. 1989: ISGS Coverages Figure Figure Wetlands currently cover less than 3% of Illinois. At the time of settlement, wetlands covered an estimated million acres or 23% of the state. A policy of no net-loss of wetlands has be
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Floodplains. Wetlands and Deep Water Habitat Public Lands n% Within One Mile B% Outside One Mile Source: hfWRlC Inventory ofLandbased Disposal Sites. 1989: ISGS Coverages Figure Figure Wetlands currently cover less than 3% of Illinois. At the time of settlement, wetlands covered an estimated million acres or 23% of the state. A policy of no net-loss of wetlands has been declared at the federal level because these ecosystems are so important to our planet ( Fish and Wildlife Service 1990). They support a high degree of biological productivity due primarily to dynamic water levels. Wetlands regulate surface water flow and groundwater recharge and also act as filters, cleaning water and trapping sediment (see wetlands section of the Critical Trends Technical Rejwrt, Volume 3: Ecological Resources). Protecting wetland areas from biological, chemical, and physical degradation that may occur as a result of leaking landfills is important. Any unnatural decline in the productivity and diversity of wetlands may have an adverse impact on our environment. Estimates of the number of designated wetlands within one mile of a known landfill were determined in this analysis. Of the total acreage of wetlands and deep water habitats, 8% is within one mile of a known landfill (Figure ). This represents more than 100,000 acres of wetlands and deep water habi- tats potentially at risk if contaminants migrate from associated landfills. Flood Hazard Areas A floodplain is the relatively flat area bordering a river that is inundated when the river overflows its banks (Costa and Baker 1981). Landfills on floodplains may pose risks to the environment if wastes wash out of the facility during episodes of high water. In the past, there were no restrictions on
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