Describe the environmental problem flooding
http://www.na.fs.fed.us/spfo/pubs/n_resource/flood/toler.htm
http://news.bbc.co.uk/2/hi/school_report/8400229.stm
http://www.soest.hawaii.edu/GG/ASK/floods.html
http://library.thinkquest.org/03oct/00758/en/disaster/flood/effects.html