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<br />With moderate regulations, Scenario II, the number of ,hous- <br />ing units and population residing inthe 100-year floodplain would <br />increase at a slow rate. Housing units would increase from 162,800 <br />in 1975 to 176,300, or 8 percent, by 1980 and to 197,900,or 22 per- <br />cent,by 1990. Population would increase from 480,500 in 1975 to <br />513,100 in 1980 and 562,900 in 1990, 7 and 17 percent increases, <br />respectively. Thus, with moderate regulations, Scenario II, as <br />compared with no regulations, Scenario I, by 1990 there would be <br />10 percent fewer housing units and 9 percent less population re- <br />siding in the 100-year floodplain. Moreover, housing units and <br />population at risk would decline by 1990 relative to their 1975 <br />levels under Scenario II due to the removal of deteriorated units <br />at risk and their replacement with new units not at risk. Simi- <br />lar declines would be achieved under Scenario III. <br /> <br />Relative to 1975, stringent regulations, Scenario III, would <br />result in fewer housing units and less population residing in the <br />100-year floodplain. The number of housing units would decline from <br />162,800 in 1975 to 160,500, or 1 percent, by 1980 and to 156,700, <br />or 4 percentJby 1990. Population in turn would decrease from <br />480,500 in 1975 to 470,200, or 2 percent, by 1980 and to 453,700, <br />or 6 percent, by 1990. In contrast to no regulations, Scenario I, <br />the number of housing units by 1990 under stringent regulations <br />would be 29 percent fewer and the population would be 27 percent <br />lower in the 100-year floodplain. Compared with moderate regu- <br />lations, by 1990 there would be 21 percent fewer housing units <br />and 19 percent less population in the 100-year floodplain under <br />stringent regulations. <br /> <br />The effects on residential occupance at risk are even more <br />profound with no regulations compared with either moderate or <br />stringent floodplain regulations. The number of housing units <br />and population at risk when no regulations, Scenario I, are ap- <br />plied would by 1990 be 39 and 44 percent higher, respectively, <br /> <br />-15- <br />