. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. URBAN DYNAMICS loss of agricultural land, NIPC estimated that overall land consumption increased by at least 44%, or 362,240 acres, over the twenty-year period (North- eastern Illinois Planning Commission 1991 Annual Report). Figure 20 illustrates the municipal boundary changes between 1980 and 1990 for this area. Similar estimates can be obtained from a relative comparison of data collected by the
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. URBAN DYNAMICS loss of agricultural land, NIPC estimated that overall land consumption increased by at least 44%, or 362,240 acres, over the twenty-year period (North- eastern Illinois Planning Commission 1991 Annual Report). Figure 20 illustrates the municipal boundary changes between 1980 and 1990 for this area. Similar estimates can be obtained from a relative comparison of data collected by the Department of Agriculture's Soil Conservation Service (SCS) nationwide inventory of land use. In looking at trends from 1967 to 1987, it should be noted that data is collected from representative sample points in each state and that the numbers are statistically reliable only at the state level. It should also be noted that different procedures were used to conduct the 1967 and 1987 inventories. However, lacking other data, the inventories can provide an indication of land use changes over the twenty-year period. Using the SCS data. Figure 21 shows the 20-year trends in urban density — the number of people (urban population) per developed acre (urban and built-up land and rural transportation land'*). In Cook County the density of persons per developed acre dropped from 15 to 10; in the collar counties it dropped from 4 to The other MSA counties had a very slight decrease, while the balance of the state increased sUghtly from .8 to .9 persons per developed acre. Combined, the six Northeastern counties (Chicago plus collar counties) saw urban density drop from 10 to 7 persons per developed acre. In the six-county area (Figure 22), only Will and McHenry counties show an increase in urban density, while in Cook, DuPage, Lake and Kane counties, urban density decreased. Balance of the state Collar counties*. Figure 21. The number of people per each acre which has been 'd
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