IV-270 



Increase 1n population from 2.5 minion persons 1n 

 1980 to 3.6 million 1n 2000. 



Urban growth has both a direct physical impact on estuarine resources 

 in the usurpation of land for development purposes, and an indirect 

 Impact in increased runoff, changed water composition, and increased 

 demand for water supplies. 



Other Implications are also important. By and large, urban popula- 

 tions are those which most strongly feel the effects -- good and bad -■ 

 of Increased per capita income, leisure time, and mobility. There 

 are, speaking very generally, three segments of the urban population 

 affected by these forces, and they react differently 1n terms of 

 the estuarine environment. The groups and the implications are: 



(1) High Income: Urban residents with high Income place 

 pressure on the estuarine environment some distance from 

 their place of residence. They are able to afford either 

 second homes or extended stays at vacation resorts. Much 

 of the total national demand expressed by that segment 



of the population in the upper middle and high income 

 brackets falls on the non-urban portions of the coastal - 

 estuarine zone. 



(2) Middle Income: Those persons with middle range incomes 

 either opt for new housing in the suburban ring surrounding 

 the central city or choose to remain within the central 

 city. In either case, their mobility is increased by their 



