Dear All: I may need your help about the subject issue. I am now working on projects related to wick drains. We don't have budget to do field tests to get the exact value of Ch. However, there are some empirical correlations between Cv and Ch. Some suggested that the ratio Ch/Cv is ranging from 1 to 10. Do anyone have any better suggestions for me about the value of Ch? Thank you for your helps in advance. AnhDan Le Ellis & Associates,Inc. 7064 Davis Creek Road Jacksonville, Fl 32256 Tel: 904-880-0960 ext.301 Fax: 904-880-0970 ooooooooooOOOoOOOoOOOooooooooooooooo AnhDan Q Le http://anhdan.tripod.com/ ooooooooooOOOoOOOoOOOooooooooooooooo __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com