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<br />Table 2: <br /> <br />Case Study Summaries of Economic, Social, and Environmental <br />Effects of Flood?lain Regulations: 1975-1990 <br /> <br />I <br />..... <br />'" <br />I <br /> <br /> 1975 1980 1990 <br /> Scenario Scenario Scenario scenario scenario Scenario <br />Characteriatic I II III I II III <br />Urban Flood LosseJ <br />(Avg. Annual, in <br />millionsl $ 76.6 $ 98.6 $ 79.4 $ 76.4 $131.0 $ 84.6 $ 76.1 <br />Change from <br />1975 UI +29 +4 b +71 +10 -1 <br />Housing Units 162,800 184,100 176,300 160,500 219,700 197,900 156,700 <br />Change from <br />1975 Ul +13 +8 -1 +35 +22 -4 <br />Housing Units at <br />Risk 87,400 98,400 85,700 85,800 116,500 83,300 83,600 <br />Chanqe from <br />1975 Ul +13 -2 -2 +33 -5 -4 <br />Population 480,500 537,200 513,100 470,200 619,300 562,900 453.700 <br />Change from <br />1915 (\1 +12 +1 -2 +29 +17 -6 <br />Population at Risk 265,500 301,100 261, 000 261,100 354,000 241,100 247,900 <br />Change from <br />1915 Ii) +13 -2 -2 +33 -1 -1 <br />Developed- Acres <br />(loss of open <br />space) 59,300 61,900 64,500 58,900 81,400 13,500 58,300 <br />Change from <br />1975 1\) +15 +9 -1 +37 +24 -2 <br /> <br />a = flood losses expressed in 1915 dollars <br />b ~ less than one-half of one percent decline <br />