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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Dear Sowacsers, I am a PhD student at the University of Leeds, England. I have been researching the ability of ground-penetrating radar (GPR) to detect leaks from water supply pipes. At my field site, I have installed 4 neutron probe access tubes and obtained a suite of data from a study leak in order to monitor soil water content changes after leak water is introduced into the soil. The access tubes had to be plastic as metal tubes would interfere with the electromagnetic equipment we use at the site. I am seeking advice on calibration techniques. I am looking at moisture changes in short time period: the leak is relatively high magnitude and so tests only last ~ 2-4 hours because the ground becomes saturated). Therefore I wondered what people thought about the importance of calibration when the difference in control and leak data is of primary concern to my work. Regards Ed O'Brien ---------------------- Edward O'Brien School of Geography University of Leeds Leeds LS6 1LP Tel: 0113-233-6638 Fax: 0113-233-3308 ----------------------