” Brasiliassa rankkasateet piinaavat nyt Sao Pauloa..”
”Maan historian pahin luonnontuho…”
http://yle.fi/uutiset/ulkomaat/2011/01/rankkasateet_upottavat_sao_paulon_naapurustoja_2300947.html?origin=rss
”Maan historian pahin luonnontuho…”
http://yle.fi/uutiset/ulkomaat/2011/01/rankkasateet_upottavat_sao_paulon_naapurustoja_2300947.html?origin=rss
Vastaukset 1
Vanhimmat
São Paulo in Brazil had about 200 thousands inhabitants in the beginning of 19 century an in 1929 had a large flood in its flood plains. Nowadays it has near to 20 million inhabitants (yearly grow rate of about 8% in a century) and the design 50 years flood is 10 times larger than 1929 due to increase peak and volume from impervious areas, channels and conduits in a area of about 1,500 km2, 50% of the overall basin.
Since 1980 there were heavy pressures for occupation of the flood plain. It was done through invasion of public green areas and by unapproved developments and occupation. In July 1983 and January 1995 two major floods occurred with severe damages of US$ 50.3 million and 40.2 million, respectively,