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Hello, My name is Jon Southen and I am a graduate student at the University of Western Ontario. I'm undertaking research looking at water transport due to temperature gradients beneath landfills. As part of this research, I will be doing some column tests on silty soil subjected to a significant temperature gradient. I would like to measure soil water content, soil matric potential (suction) as well as temperature. Although TDR seems to be the "best" way to measure water content, I have concerns regarding the dependence of the dielectric constant of soil on temperature and density. Since both of these variables change during the course of my testing, I need to be able to calibrate moisture content readings to both of these factors. This approach seems to be potentially difficult. Does anyone have any suggestions as to the best way to approach this problem? Would another method of water content / matric potential measurement be more suitable? I need undisturbed measurements at various times over an approximately one month period. Any suggestions would be appreciated. === Jon Southen, B.E.Sc. Graduate Student, Department of Civil Engineering University of Western Ontario jmsouthe@julian.uwo.ca PHONE : (519) 661-2111 ext. 8291 FAX : (519) 661-3942 _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com